Source Code

These source-code files were from the printout at the MIT Museum, with many thanks to Deborah Douglas, the Museum's Curator of Science and Technology, for releasing it to us. The printout was digitally photographed by Paul Fjeld. A team of volunteers transcribed the source code manually from these images or, where appropriate, modified already-transcribed but similar source Luminary 131 (Apollo 13) source code to agree with the images from the printout. Note that the page images presented online are of reduced quality, and that higher-quality images are available. Report any conversion errors or legibility problems in page images to info@sandroid.org. Notations on the program listing read, in part:

	GAP:  ASSEMBLE REVISION 001 OF AGC PROGRAM LMY99 BY NASA 2021112-061
	16:27 JULY 14,1969
Note that the date is the date of the printout, not the date of the program revision.

039234,000002:                                                                                                  ## Copyright:   Public domain.
039235,000003:                                                                                                  ## Filename:    LANDING_ANALOG_DISPLAYS.agc
039236,000004:                                                                                                  ## Purpose:     Part of the source code for Luminary, build 099. It
039237,000005:                                                                                                  ##              is part of the source code for the Lunar Module's
039238,000006:                                                                                                  ##              (LM) Apollo Guidance Computer (AGC), Apollo 11.
039239,000007:                                                                                                  ## Assembler:   yaYUL
039240,000008:                                                                                                  ## Reference:   pp. 898-907
039241,000009:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>,
039242,000010:                                                                                                  ##              Fabrizio Bernardini <fabrizio@spacecraft.it>
039243,000011:                                                                                                  ## Website:     http://www.ibiblio.org/apollo.
039244,000012:                                                                                                  ## Mod history: 05/06/09 FB     Transcription Batch 4 Assignment.
039245,000013:                                                                                                  ##              2016-12-17 RSB  Proofed text comments with octopus/ProoferComments
039246,000014:                                                                                                  ##                              and corrected the errors found.
039247,000015:                                                                                                  ##
039248,000016:                                                                                                  ## The contents of the "Luminary099" files, in general, are transcribed 
039249,000017:                                                                                                  ## from scanned documents. 
039250,000018:                                                                                                  ##
039251,000019:                                                                                                  ##      Assemble revision 001 of AGC program Luminary099 by NASA
039252,000020:                                                                                                  ##      2021112-061.  July 14, 1969.  
039253,000021:                                                                                                  ##
039254,000022:                                                                                                  ##      Prepared by
039255,000023:                                                                                                  ##                      Massachusetts Institute of Technology
039256,000024:                                                                                                  ##                      75 Cambridge Parkway
039257,000025:                                                                                                  ##                      Cambridge, Massachusetts
039258,000026:                                                                                                  ##
039259,000027:                                                                                                  ##      under NASA contract NAS 9-4065.
039260,000028:                                                                                                  ##
039261,000029:                                                                                                  ## Refer directly to the online document mentioned above for further
039262,000030:                                                                                                  ## information.  Please report any errors to info@sandroid.org.
039263,000031: 

Page 898

039265,000033: 21,2154                                           BANK     21                                    
039266,000034: 21,2000                                           SETLOC   R10                                   
039267,000035: 21,2000                                           BANK                                           
039268,000036: 
039269,000037: 21,2154  E7,1536                                  EBANK=   UNIT/R/                               
039270,000038: 21,2154                                           COUNT*   $$/R10                                
039271,000039: 
039272,000040: 21,2154           23714        LANDISP            LXCH     PIPCTR1                               #  UPDATE TBASE2 AND PIPCTR SIMULTANEOUSLY.
039273,000041: 21,2155           40025                           CS       TIME1                                 
039274,000042: 21,2156           53056                           DXCH     TBASE2                                
039275,000043: 
039276,000044: 21,2157           40103                           CS       FLAGWRD7                              #  IS LANDING ANALOG DISPLAYS FLAG SET?
039277,000045: 21,2160           74741                           MASK     SWANDBIT                              
039278,000046: 21,2161           10000                           CCS      A                                     
039279,000047: 21,2162           13053                           TCF      DISPRSET                              #  NO.
039280,000048: 21,2163           31303                           CA       IMODES33                              #  BIT 7 = 0 (DO ALTRATE), =1 (DO ALT.)
039281,000049: 21,2164           74745                           MASK     BIT7                                  
039282,000050: 21,2165           10000                           CCS      A                                     
039283,000051: 21,2166           12240                           TCF      ALTOUT                                
039284,000052: 21,2167           02324        ALTROUT            TC       DISINDAT                              #  CHECK MODE SELECT SWITCH AND DIDFLG.
039285,000053: 21,2170           41303                           CS       IMODES33                              
039286,000054: 21,2171           74745                           MASK     BIT7                                  
039287,000055: 21,2172           27303                           ADS      IMODES33                              #  ALTERNATE ALTITUDE RATE WITH ALTITUDE.
039288,000056: 21,2173           34752                           CAF      BIT2                                  #  RATE COMMAND IS EXECUTED BEFORE RANGE.
039289,000057: 21,2174           00006                           EXTEND                                         
039290,000058: 21,2175           05014                           WOR      CHAN14                                #  ALTRATE (BIT2 = 1), ALTITUDE (BIT2 = 0).
039291,000059: 21,2176           31743        ARCOMP             CA       RUNIT                                 #  COMPUTE ALTRATE = RUNIT.VVECT M/CS *2(-6).
039292,000060: 21,2177           00006                           EXTEND                                         
039293,000061: 21,2200           71706                           MP       VVECT                                 #  MULTIPLY X-COMPONENTS.
039294,000062: 21,2201           56070                           XCH      RUPTREG1                              #  SAVE SINGLE PRECISION RESULT M/CS*2(-6).
039295,000063: 21,2202           31744                           CA       RUNIT      +1                         #  MULTIPLY Y-COMPONENTS.
039296,000064: 21,2203           00006                           EXTEND                                         
039297,000065: 21,2204           71707                           MP       VVECT      +1                         
039298,000066: 21,2205           26070                           ADS      RUPTREG1                              #  ACCUMULATE PARTIAL PRODUCTS.
039299,000067: 21,2206           31745                           CA       RUNIT      +2                         #  MULTIPLY Z-COMPONENTS.
039300,000068: 21,2207           00006                           EXTEND                                         
039301,000069: 21,2210           71710                           MP       VVECT      +2                         
039302,000070: 21,2211           26070                           ADS      RUPTREG1                              #  ALTITUDE RATE IN M/CS *2(-6).
039303,000071: 21,2212           32000                           CA       ARCONV                                #  CONVERT ALTRATE TO BIT UNITS (.5FPS/BIT)
039304,000072: 21,2213           00006                           EXTEND                                         
039305,000073: 21,2214           70070                           MP       RUPTREG1                              
039306,000074: 21,2215           20001                           DDOUBL                                         
039307,000075: 21,2216           20001                           DDOUBL                                         
039308,000076: 21,2217           56070                           XCH      RUPTREG1                              #  ALTITUDE RATE IN BIT UNITS*2(-14).
039309,000077: 21,2220           31716                           CA       DALTRATE                              #  ALTITUDE RATE COMPENSATION FACTOR.
039310,000078: 21,2221           00006                           EXTEND                                         
039311,000079: 21,2222           71715                           MP       DT                                    
039312,000080: 21,2223           60070                           AD       RUPTREG1                              
039313,000081: 21,2224           55711                           TS       ALTRATE                               #  ALTITUDE RATE IN BIT UNITS*2(-14).
039314,000082: 21,2225           41711                           CS       ALTRATE                               

Page 899

039316,000084: 21,2226           00006                           EXTEND                                         #  CHECK POLARITY OF ALTITUDE RATE.
039317,000085: 21,2227           62231                           BZMF     +2                                    
039318,000086: 21,2230           12233                           TCF      DATAOUT                               #  NEGATIVE - SEND POS. PULSES TO ALTM REG.
039319,000087: 21,2231           31711                           CA       ALTRATE                               #  POSITIVE OR ZERO - SET SIGN BIT = 1 AND
039320,000088: 21,2232           64735                           AD       BIT15                                 #  SEND TO ALTM REGISTER.  *DO NOT SEND +0*
039321,000089: 21,2233           54060        DATAOUT            TS       ALTM                                  #  ACTIVATE THE LANDING ANALOG DISPLAYS - -
039322,000090: 21,2234           34751                           CAF      BIT3                                  
039323,000091: 21,2235           00006                           EXTEND                                         
039324,000092: 21,2236           05014                           WOR      CHAN14                                #  BIT3 DRIVES THE ALT/ALTRATE METER.
039325,000093: 21,2237           15261                           TCF      TASKOVER                              #  EXIT
039326,000094: 
039327,000095: 21,2240           02324        ALTOUT             TC       DISINDAT                              #  CHECK MODE SELECT SWITCH AND DIDFLG.
039328,000096: 21,2241           44745                           CS       BIT7                                  
039329,000097: 21,2242           71303                           MASK     IMODES33                              
039330,000098: 21,2243           55303                           TS       IMODES33                              #  ALTERNATE ALTITUDE RATE WITH ALTITUDE.
039331,000099: 21,2244           44752                           CS       BIT2                                  
039332,000100: 21,2245           00006                           EXTEND                                         
039333,000101: 21,2246           03014                           WAND     CHAN14                                
039334,000102: 21,2247           11741                           CCS      ALTBITS                               #  = -1 IF OLD ALT. DATA TO BE EXTRAPOLATED.
039335,000103: 21,2250           12254                           TCF      +4                                    
039336,000104: 21,2251           12254                           TCF      +3                                    
039337,000105: 21,2252           12272                           TCF      OLDDATA                               
039338,000106: 21,2253           55741                           TS       ALTBITS                               #  SET ALTBITS FROM -0 TO +0.
039339,000107: 21,2254           44753                           CS       ONE                                   
039340,000108: 21,2255           53742                           DXCH     ALTBITS                               #  SET ALTBITS = -1 FOR SWITCH USE NEXT PASS.
039341,000109: 21,2256           53713                           DXCH     ALTSAVE                               
039342,000110: 21,2257           34742                           CA       BIT10                                 #  NEW ALTITUDE EXTRAPOLATION WITH ALTRATE.
039343,000111: 21,2260           56002                           XCH      Q                                     
039344,000112: 21,2261           22007                           LXCH     7                                     #  ZL
039345,000113: 21,2262           31715                           CA       DT                                    
039346,000114: 21,2263           00006                           EXTEND                                         
039347,000115: 21,2264           10002                           DV       Q                                     #  RESCALE DT*2(-14) TO *2(-9) TIME IN CS.
039348,000116: 21,2265           00006                           EXTEND                                         
039349,000117: 21,2266           72002                           MP       ARTOA2                                #  .0021322 *2(+8)
039350,000118: 21,2267           12273                           TCF      OLDDATA    +1                         #  RATE APPLIES FOR DT CS.
039351,000119: 
039352,000120: 21,2270           53713        ZDATA2             DXCH     ALTSAVE                               
039353,000121: 21,2271           12313                           TCF      NEWDATA                               
039354,000122: 21,2272           32001        OLDDATA            CA       ARTOA                                 #  RATE APPLIES FOR .5 SEC. (4X/SEC. CYCLE)
039355,000123: 21,2273           00006                           EXTEND                                         
039356,000124: 21,2274           71711                           MP       ALTRATE                               #  EXTRAPOLATE WITH ALTITUDE RATE.
039357,000125: 21,2275           20001                           DDOUBL                                         
039358,000126: 21,2276           61713                           AD       ALTSAVE    +1                         
039359,000127: 21,2277           55713                           TS       ALTSAVE    +1                         
039360,000128: 21,2300           34755                           CAF      ZERO                                  
039361,000129: 21,2301           27712                           ADS      ALTSAVE                               
039362,000130: 21,2302           34733                           CAF      POSMAX                                #  FORCE SIGN AGREEMENT ASSUMING A
039363,000131: 21,2303           64753                           AD       ONE                                   #  NON-NEGATIVE ALTSAVE.
039364,000132: 21,2304           61713                           AD       ALTSAVE    +1                         #  IF ALTSAVE IS NEGATIVE, ZERO ALTSAVE
039365,000133: 21,2305           55713                           TS       ALTSAVE    +1                         #  AND ALTSAVE +1 AT ZERODATA.

Page 900

039367,000135: 21,2306           34755                           CAF      ZERO                                  
039368,000136: 21,2307           64733                           AD       POSMAX                                
039369,000137: 21,2310           61712                           AD       ALTSAVE                               
039370,000138: 21,2311           55712                           TS       ALTSAVE                               #  POSSIBLY SKIP TO NEWDATA.
039371,000139: 21,2312           13050                           TCF      ZERODATA                              
039372,000140: 21,2313           11713        NEWDATA            CCS      ALTSAVE    +1                         
039373,000141: 21,2314           12320                           TCF      +4                                    
039374,000142: 21,2315           12320                           TCF      +3                                    
039375,000143: 21,2316           34755                           CAF      ZERO                                  #  SET NEGATIVE ALTSAVE +1 TO +0.
039376,000144: 21,2317           55713                           TS       ALTSAVE    +1                         
039377,000145: 21,2320           11712                           CCS      ALTSAVE                               #  PROVIDE A 15 BIT UNSIGNED OUTPUT.
039378,000146: 21,2321           34735                           CAF      BIT15                                 #  THE HI-ORDER PART IS +1 OR +0.
039379,000147: 21,2322           61713                           AD       ALTSAVE    +1                         
039380,000148: 21,2323           12233                           TCF      DATAOUT                               #  DISPATCH UNSIGNED BITS TO ALTM REG.
039381,000149: 21,2324           00006        DISINDAT           EXTEND                                         
039382,000150: 21,2325           23714                           QXCH     LADQSAVE                              #  SAVE RETURN TO ALTROUT +1 OR ALTOUT +1
039383,000151: 21,2326           34746                           CAF      BIT6                                  
039384,000152: 21,2327           00006                           EXTEND                                         #  WISHETH THE ASTRONAUT THE ANALOG
039385,000153: 21,2330           02030                           RAND     CHAN30                                #  DISPLAYS?  I.E.,
039386,000154: 21,2331           10000                           CCS      A                                     #  IS THE MODE SELECT SWITCH IN PGNCS?
039387,000155: 21,2332           13053                           TCF      DISPRSET                              #  NO.  ASTRONAUT REQUESTS NO INERTIAL DATA
039388,000156: 21,2333           40075                           CS       FLAGWRD1                              #  YES.  CHECK STATUS OF DIDFLAG.
039389,000157: 21,2334           74736                           MASK     DIDFLBIT                              
039390,000158: 21,2335           00006                           EXTEND                                         
039391,000159: 21,2336           12374                           BZF      SPEEDRUN                              #  SET.  PERFORM DATA DISPLAY SEQUENCE.
039392,000160: 21,2337           40075                           CS       FLAGWRD1                              #  RESET.  PERFORM INITIALIZATION FUNCTIONS.
039393,000161: 21,2340           74736                           MASK     DIDFLBIT                              
039394,000162: 21,2341           26075                           ADS      FLAGWRD1                              #  SET DIDFLAG.
039395,000163: 21,2342           44745                           CS       BIT7                                  
039396,000164: 21,2343           71303                           MASK     IMODES33                              #  TO DISPLAY ALTRATE FIRST AND ALT. SECOND
039397,000165: 21,2344           55303                           TS       IMODES33                              
039398,000166: 21,2345           40074                           CS       FLAGWRD0                              #  ARE WE IN DESCENT TRAJECTORY?
039399,000167: 21,2346           74752                           MASK     R10FLBIT                              
039400,000168: 21,2347           00006                           EXTEND                                         
039401,000169: 21,2350           15261                           BZF      TASKOVER                              #  NO
039402,000170: 21,2351           34744                           CAF      BIT8                                  #  YES.
039403,000171: 21,2352           00006                           EXTEND                                         
039404,000172: 21,2353           05012                           WOR      CHAN12                                #  SET DISPLAY INERTIAL DATA OUTBIT.
039405,000173: 21,2354           34755                           CAF      ZERO                                  
039406,000174: 21,2355           55702                           TS       TRAKLATV                              #  LATERAL VELOCITY MONITOR FLAG
039407,000175: 21,2356           55703                           TS       TRAKFWDV                              #  FORWARD VELOCITY MONITOR FLAG
039408,000176: 21,2357           55676                           TS       LATVMETR                              #  LATVEL MONITOR METER
039409,000177: 21,2360           55677                           TS       FORVMETR                              #  FORVEL MONITOR METER
039410,000178: 21,2361           34750                           CAF      BIT4                                  
039411,000179: 21,2362           05173                           TC       TWIDDLE                               
039412,000180: 21,2363           02365                           ADRES    INTLZE                                
039413,000181: 21,2364           15261                           TCF      TASKOVER                              
039414,000182: 21,2365           34752        INTLZE             CAF      BIT2                                  
039415,000183: 21,2366           00006                           EXTEND                                         
039416,000184: 21,2367           05012                           WOR      CHAN12                                #  ENABLE RR ERROR COUNTER.

Page 901

039418,000186: 21,2370           41303                           CS       IMODES33                              
039419,000187: 21,2371           74744                           MASK     BIT8                                  
039420,000188: 21,2372           27303                           ADS      IMODES33                              #  SET INERTIAL DATA FLAG.
039421,000189: 21,2373           15261                           TCF      TASKOVER                              
039422,000190: 
039423,000191: 21,2374           41235        SPEEDRUN           CS       PIPTIME    +1                         #  UPDATE THE VELOCITY VECTOR
039424,000192: 21,2375           60025                           AD       TIME1                                 #  COMPUTE T - TN
039425,000193: 21,2376           64736                           AD       HALF                                  #  CORRECT FOR POSSIBLE OVERFLOW OF TIME1.
039426,000194: 21,2377           64736                           AD       HALF                                  
039427,000195: 21,2400           57715                           XCH      DT                                    #  SAVE FOR LATER USE
039428,000196: 21,2401           34777                           CA       1SEC                                  
039429,000197: 21,2402           54065                           TS       ITEMP5                                #  INITIALIZE FOR DIVISION LATER
039430,000198: 21,2403           00006                           EXTEND                                         
039431,000199: 21,2404           31237                           DCA      GDT/2                                 #  COMPUTE THE X-COMPONENT OF VELOCITY.
039432,000200: 21,2405           20001                           DDOUBL                                         
039433,000201: 21,2406           20001                           DDOUBL                                         
039434,000202: 21,2407           00006                           EXTEND                                         
039435,000203: 21,2410           71715                           MP       DT                                    
039436,000204: 21,2411           00006                           EXTEND                                         
039437,000205: 21,2412           10065                           DV       ITEMP5                                
039438,000206: 21,2413           57706                           XCH      VVECT                                 #  VVECT = G(T-TN) M/CS *2(-5)
039439,000207: 21,2414           00006                           EXTEND                                         
039440,000208: 21,2415           31527                           DCA      V                                     #  M/CS *2(-7)
039441,000209: 21,2416           20001                           DDOUBL                                         #  RESCALE TO 2(-5)
039442,000210: 21,2417           20001                           DDOUBL                                         
039443,000211: 21,2420           27706                           ADS      VVECT                                 #  VVECT = VN + G(T-TN) M/CS *2(-5)
039444,000212: 21,2421           30037                           CA       PIPAX                                 #  DELV CM/SEC *2(-14)
039445,000213: 21,2422           61160                           AD       PIPATMPX                              #  IN CASE PIPAX HAS BEEN ZEROED
039446,000214: 21,2423           00006                           EXTEND                                         
039447,000215: 21,2424           72004                           MP       KPIP1(5)                              #  DELV M/CS *2(-5)
039448,000216: 21,2425           27706                           ADS      VVECT                                 #  VVECT = VN + DELV + GN(T-TN) M/CS *2(-5)
039449,000217: 21,2426           00006                           EXTEND                                         
039450,000218: 21,2427           31241                           DCA      GDT/2      +2                         #  COMPUTE THE Y-COMPONENT OF VELOCITY.
039451,000219: 21,2430           20001                           DDOUBL                                         
039452,000220: 21,2431           20001                           DDOUBL                                         
039453,000221: 21,2432           00006                           EXTEND                                         
039454,000222: 21,2433           71715                           MP       DT                                    
039455,000223: 21,2434           00006                           EXTEND                                         
039456,000224: 21,2435           10065                           DV       ITEMP5                                
039457,000225: 21,2436           57707                           XCH      VVECT      +1                         
039458,000226: 21,2437           00006                           EXTEND                                         
039459,000227: 21,2440           31531                           DCA      V          +2                         
039460,000228: 21,2441           20001                           DDOUBL                                         
039461,000229: 21,2442           20001                           DDOUBL                                         
039462,000230: 21,2443           27707                           ADS      VVECT      +1                         
039463,000231: 21,2444           30040                           CA       PIPAY                                 
039464,000232: 21,2445           61161                           AD       PIPATMPY                              
039465,000233: 21,2446           00006                           EXTEND                                         
039466,000234: 21,2447           72004                           MP       KPIP1(5)                              
039467,000235: 21,2450           27707                           ADS      VVECT      +1                         

Page 902

039469,000237: 21,2451           00006                           EXTEND                                         
039470,000238: 21,2452           31243                           DCA      GDT/2      +4                         #  COMPUTE THE Z-COMPONENT OF VELOCITY.
039471,000239: 21,2453           20001                           DDOUBL                                         
039472,000240: 21,2454           20001                           DDOUBL                                         
039473,000241: 21,2455           00006                           EXTEND                                         
039474,000242: 21,2456           71715                           MP       DT                                    
039475,000243: 21,2457           00006                           EXTEND                                         
039476,000244: 21,2460           10065                           DV       ITEMP5                                
039477,000245: 21,2461           57710                           XCH      VVECT      +2                         
039478,000246: 21,2462           00006                           EXTEND                                         
039479,000247: 21,2463           31533                           DCA      V          +4                         
039480,000248: 21,2464           20001                           DDOUBL                                         
039481,000249: 21,2465           20001                           DDOUBL                                         
039482,000250: 21,2466           27710                           ADS      VVECT      +2                         
039483,000251: 21,2467           30041                           CA       PIPAZ                                 
039484,000252: 21,2470           61162                           AD       PIPATMPZ                              
039485,000253: 21,2471           00006                           EXTEND                                         
039486,000254: 21,2472           72004                           MP       KPIP1(5)                              
039487,000255: 21,2473           27710                           ADS      VVECT      +2                         
039488,000256: 
039489,000257: 21,2474           34751                           CAF      BIT3                                  #  PAUSE 40 MS TO LET OTHER RUPTS IN.
039490,000258: 21,2475           05224                           TC       VARDELAY                              
039491,000259: 
039492,000260: 21,2476           40074                           CS       FLAGWRD0                              #  ARE WE IN DESCENT TRAJECTORY?
039493,000261: 21,2477           74752                           MASK     R10FLBIT                              
039494,000262: 21,2500           10000                           CCS      A                                     
039495,000263: 21,2501           12503                           TCF      +2                                    #  YES.
039496,000264: 21,2502           01714                           TC       LADQSAVE                              #  NO.
039497,000265: 
039498,000266: 21,2503           31733                           CA       DELVS                                 #  HI X OF VELOCITY CORRECTION TERM.
039499,000267: 21,2504           61706                           AD       VVECT                                 #  HI X OF UPDATED VELOCITY VECTOR.
039500,000268: 21,2505           54061                           TS       ITEMP1                                #  = VX - DVX M/CS *2(-5).
039501,000269: 21,2506           31735                           CA       DELVS      +2                         #     Y
039502,000270: 21,2507           61707                           AD       VVECT      +1                         #     Y
039503,000271: 21,2510           54062                           TS       ITEMP2                                #  = VY - DVY M/CS *2(-5).
039504,000272: 21,2511           31737                           CA       DELVS      +4                         #     Z
039505,000273: 21,2512           61710                           AD       VVECT      +2                         #     Z
039506,000274: 21,2513           54063                           TS       ITEMP3                                #  = VZ - DVZ M/CS *2(-5).
039507,000275: 21,2514           30061                           CA       ITEMP1                                #  COMPUTE VHY, VELOCITY DIRECTED ALONG THE
039508,000276: 21,2515           00006                           EXTEND                                         #  Y-COORDINATE.
039509,000277: 21,2516           71717                           MP       UHYP                                  #  HI X OF CROSS-RANGE HALF-UNIT VECTOR.
039510,000278: 21,2517           56070                           XCH      RUPTREG1                              
039511,000279: 21,2520           30062                           CA       ITEMP2                                
039512,000280: 21,2521           00006                           EXTEND                                         
039513,000281: 21,2522           71721                           MP       UHYP       +2                         #  Y
039514,000282: 21,2523           26070                           ADS      RUPTREG1                              #  ACCUMULATE PARTIAL PRODUCTS.
039515,000283: 21,2524           30063                           CA       ITEMP3                                
039516,000284: 21,2525           00006                           EXTEND                                         
039517,000285: 21,2526           71723                           MP       UHYP       +4                         #  Z
039518,000286: 21,2527           26070                           ADS      RUPTREG1                              

Page 903

039520,000288: 21,2530           30070                           CA       RUPTREG1                              
039521,000289: 21,2531           60000                           DOUBLE                                         
039522,000290: 21,2532           57704                           XCH      VHY                                   #  VHY=VMP.UHYP M/CS*2(-5).
039523,000291: 21,2533           30061                           CA       ITEMP1                                #  NOW COMPUTE VHZ, VELOCITY DIRECTED ALONG
039524,000292: 21,2534           00006                           EXTEND                                         #  THE Z-COORDINATE.
039525,000293: 21,2535           71725                           MP       UHZP                                  #  HI X OF DOWN-RANGE HALF-UNIT VECTOR.
039526,000294: 21,2536           56070                           XCH      RUPTREG1                              
039527,000295: 21,2537           30062                           CA       ITEMP2                                
039528,000296: 21,2540           00006                           EXTEND                                         
039529,000297: 21,2541           71727                           MP       UHZP       +2                         #  Y
039530,000298: 21,2542           26070                           ADS      RUPTREG1                              #  ACCUMULATE PARTIAL PRODUCTS.
039531,000299: 21,2543           30063                           CA       ITEMP3                                
039532,000300: 21,2544           00006                           EXTEND                                         
039533,000301: 21,2545           71731                           MP       UHZP       +4                         #  Z
039534,000302: 21,2546           26070                           ADS      RUPTREG1                              
039535,000303: 21,2547           30070                           CA       RUPTREG1                              
039536,000304: 21,2550           60000                           DOUBLE                                         
039537,000305: 21,2551           57705                           XCH      VHZ                                   #  VHZ = VMP.UHZP M/CS*2(-5).
039538,000306: 21,2552           35015        GET22/32           CAF      EBANK6                                #  GET SIN(AOG),COS(AOG) FROM GPMATRIX.
039539,000307: 21,2553           54003                           TS       EBANK                                 
039540,000308: 21,2554  E6,1417                                  EBANK=   M22                                   
039541,000309: 21,2554           31417                           CA       M22                                   
039542,000310: 21,2555           54063                           TS       ITEMP3                                
039543,000311: 21,2556           31420                           CA       M32                                   
039544,000312: 21,2557           54064                           TS       ITEMP4                                
039545,000313: 21,2560           35016                           CAF      EBANK7                                
039546,000314: 21,2561           54003                           TS       EBANK                                 
039547,000315: 21,2562  E7,1536                                  EBANK=   UNIT/R/                               
039548,000316: 21,2562           30064        LATFWDV            CA       ITEMP4                                #  COMPUTE LATERAL AND FORWARD VELOCITIES.
039549,000317: 21,2563           00006                           EXTEND                                         
039550,000318: 21,2564           71704                           MP       VHY                                   
039551,000319: 21,2565           56070                           XCH      RUPTREG1                              
039552,000320: 21,2566           30063                           CA       ITEMP3                                
039553,000321: 21,2567           00006                           EXTEND                                         
039554,000322: 21,2570           71705                           MP       VHZ                                   
039555,000323: 21,2571           26070                           ADS      RUPTREG1                              #  = VHY(COS)AOG+VHZ(SIN)AOG M/CS *2(-5)
039556,000324: 21,2572           32003                           CA       VELCONV                               #  CONVERT LATERAL VELOCITY TO BIT UNITS.
039557,000325: 21,2573           00006                           EXTEND                                         
039558,000326: 21,2574           70070                           MP       RUPTREG1                              
039559,000327: 21,2575           20001                           DDOUBL                                         
039560,000328: 21,2576           57700                           XCH      LATVEL                                #  LATERAL VELOCITY IN BIT UNITS *2(-14).
039561,000329: 21,2577           30064                           CA       ITEMP4                                #  COMPUTE FORWARD VELOCITY.
039562,000330: 21,2600           00006                           EXTEND                                         
039563,000331: 21,2601           71705                           MP       VHZ                                   
039564,000332: 21,2602           56070                           XCH      RUPTREG1                              
039565,000333: 21,2603           30063                           CA       ITEMP3                                
039566,000334: 21,2604           00006                           EXTEND                                         
039567,000335: 21,2605           71704                           MP       VHY                                   
039568,000336: 21,2606           40000                           CS       A                                     
039569,000337: 21,2607           26070                           ADS      RUPTREG1                              #  =VHZ(COS)AOG-VHY(SIN)AOG M/CS *2(-5).

Page 904

039571,000339: 21,2610           32003                           CA       VELCONV                               #  CONVERT FORWARD VELOCITY TO BIT UNITS.
039572,000340: 21,2611           00006                           EXTEND                                         
039573,000341: 21,2612           70070                           MP       RUPTREG1                              
039574,000342: 21,2613           20001                           DDOUBL                                         
039575,000343: 21,2614           57701                           XCH      FORVEL                                #  FORWARD VELOCITY IN BIT UNITS *2(-14).
039576,000344: 
039577,000345: 21,2615           42005                           CS       MAXVBITS                              #  ACC.=-199.9989 FT./SEC.
039578,000346: 21,2616           54066                           TS       ITEMP6                                #  -547 BIT UNITS (OCTAL) AT 0.5571 FPS/BIT
039579,000347: 
039580,000348: 21,2617           34753                           CAF      ONE                                   #  LOOP TWICE.
039581,000349: 21,2620           54065        VMONITOR           TS       ITEMP5                                #  FORWARD AND LATERAL VELOCITY LANDING
039582,000350: 21,2621           50065                           INDEX    ITEMP5                                #        ANALOG DISPLAYS MONITOR.
039583,000351: 21,2622           11700                           CCS      LATVEL                                
039584,000352: 21,2623           12627                           TCF      +4                                    
039585,000353: 21,2624           12730                           TCF      LVLIMITS                              
039586,000354: 21,2625           12635                           TCF      +8D                                   
039587,000355: 21,2626           12730                           TCF      LVLIMITS                              
039588,000356: 21,2627           50065                           INDEX    ITEMP5                                
039589,000357: 21,2630           41700                           CS       LATVEL                                
039590,000358: 21,2631           62005                           AD       MAXVBITS                              #  +199.9989 FT./SEC.
039591,000359: 21,2632           00006                           EXTEND                                         
039592,000360: 21,2633           62643                           BZMF     CHKLASTY                              
039593,000361: 21,2634           12730                           TCF      LVLIMITS                              
039594,000362: 21,2635           50065                           INDEX    ITEMP5                                
039595,000363: 21,2636           31700                           CA       LATVEL                                
039596,000364: 21,2637           62005                           AD       MAXVBITS                              
039597,000365: 21,2640           00006                           EXTEND                                         
039598,000366: 21,2641           62643                           BZMF     +2                                    
039599,000367: 21,2642           12730                           TCF      LVLIMITS                              
039600,000368: 21,2643           50065        CHKLASTY           INDEX    ITEMP5                                
039601,000369: 21,2644           11676                           CCS      LATVMETR                              
039602,000370: 21,2645           12651                           TCF      +4                                    
039603,000371: 21,2646           12662                           TCF      LASTOK                                
039604,000372: 21,2647           12656                           TCF      +7                                    
039605,000373: 21,2650           12662                           TCF      LASTOK                                
039606,000374: 21,2651           50065                           INDEX    ITEMP5                                
039607,000375: 21,2652           31700                           CA       LATVEL                                
039608,000376: 21,2653           00006                           EXTEND                                         
039609,000377: 21,2654           62701                           BZMF     LASTPOSY   +5                         
039610,000378: 21,2655           12662                           TCF      +5                                    
039611,000379: 21,2656           50065                           INDEX    ITEMP5                                
039612,000380: 21,2657           41700                           CS       LATVEL                                
039613,000381: 21,2660           00006                           EXTEND                                         
039614,000382: 21,2661           62716                           BZMF     LASTNEGY   +4                         
039615,000383: 21,2662           50065        LASTOK             INDEX    ITEMP5                                
039616,000384: 21,2663           11702                           CCS      TRAKLATV                              
039617,000385: 21,2664           12674                           TCF      LASTPOSY                              
039618,000386: 21,2665           12667                           TCF      +2                                    
039619,000387: 21,2666           12712                           TCF      LASTNEGY                              
039620,000388: 21,2667           50065                           INDEX    ITEMP5                                

Page 905

039622,000390: 21,2670           31700                           CA       LATVEL                                
039623,000391: 21,2671           00006                           EXTEND                                         
039624,000392: 21,2672           62720                           BZMF     NEGVMAXY                              
039625,000393: 21,2673           12703                           TCF      POSVMAXY                              
039626,000394: 21,2674           50065        LASTPOSY           INDEX    ITEMP5                                
039627,000395: 21,2675           31700                           CA       LATVEL                                
039628,000396: 21,2676           00006                           EXTEND                                         
039629,000397: 21,2677           62701                           BZMF     +2                                    
039630,000398: 21,2700           12703                           TCF      POSVMAXY                              
039631,000399: 21,2701           42005                           CS       MAXVBITS                              
039632,000400: 21,2702           13024                           TCF      ZEROLSTY                              
039633,000401: 21,2703           50065        POSVMAXY           INDEX    ITEMP5                                
039634,000402: 21,2704           41676                           CS       LATVMETR                              
039635,000403: 21,2705           62005                           AD       MAXVBITS                              
039636,000404: 21,2706           50065                           INDEX    ITEMP5                                
039637,000405: 21,2707           56072                           XCH      RUPTREG3                              
039638,000406: 21,2710           34753                           CAF      ONE                                   
039639,000407: 21,2711           13027                           TCF      ZEROLSTY   +3                         
039640,000408: 21,2712           50065        LASTNEGY           INDEX    ITEMP5                                
039641,000409: 21,2713           31700                           CA       LATVEL                                
039642,000410: 21,2714           00006                           EXTEND                                         
039643,000411: 21,2715           62720                           BZMF     NEGVMAXY                              
039644,000412: 21,2716           32005                           CA       MAXVBITS                              
039645,000413: 21,2717           13024                           TCF      ZEROLSTY                              
039646,000414: 21,2720           50065        NEGVMAXY           INDEX    ITEMP5                                
039647,000415: 21,2721           31676                           CA       LATVMETR                              
039648,000416: 21,2722           62005                           AD       MAXVBITS                              
039649,000417: 21,2723           40000                           COM                                            
039650,000418: 21,2724           50065                           INDEX    ITEMP5                                
039651,000419: 21,2725           56072                           XCH      RUPTREG3                              
039652,000420: 21,2726           44753                           CS       ONE                                   
039653,000421: 21,2727           13027                           TCF      ZEROLSTY   +3                         
039654,000422: 21,2730           50065        LVLIMITS           INDEX    ITEMP5                                
039655,000423: 21,2731           11702                           CCS      TRAKLATV                              
039656,000424: 21,2732           12761                           TCF      LATVPOS                               
039657,000425: 21,2733           12735                           TCF      +2                                    
039658,000426: 21,2734           12766                           TCF      LATVNEG                               
039659,000427: 21,2735           50065                           INDEX    ITEMP5                                
039660,000428: 21,2736           41676                           CS       LATVMETR                              
039661,000429: 21,2737           00006                           EXTEND                                         
039662,000430: 21,2740           62742                           BZMF     +2                                    
039663,000431: 21,2741           12775                           TCF      NEGLMLV                               
039664,000432: 21,2742           50065                           INDEX    ITEMP5                                
039665,000433: 
039666,000434: 21,2743           41700                           CS       LATVEL                                
039667,000435: 21,2744           00006                           EXTEND                                         
039668,000436: 21,2745           63020                           BZMF     LVMINLM                               
039669,000437: 21,2746           60066                           AD       ITEMP6                                
039670,000438: 21,2747           50065                           INDEX    ITEMP5                                
039671,000439: 21,2750           61676                           AD       LATVMETR                              
039672,000440: 21,2751           00006                           EXTEND                                         

Page 906

039674,000442: 21,2752           63020                           BZMF     LVMINLM                               
039675,000443: 21,2753           50065                           INDEX    ITEMP5                                
039676,000444: 21,2754           61700                           AD       LATVEL                                
039677,000445: 21,2755           00006                           EXTEND                                         
039678,000446: 21,2756           50065                           INDEX    ITEMP5                                
039679,000447: 21,2757           61676                           SU       LATVMETR                              
039680,000448: 21,2760           13024                           TCF      ZEROLSTY                              
039681,000449: 21,2761           50065        LATVPOS            INDEX    ITEMP5                                
039682,000450: 21,2762           41700                           CS       LATVEL                                
039683,000451: 21,2763           00006                           EXTEND                                         
039684,000452: 21,2764           63020                           BZMF     LVMINLM                               
039685,000453: 21,2765           12772                           TCF      +5                                    
039686,000454: 21,2766           50065        LATVNEG            INDEX    ITEMP5                                
039687,000455: 21,2767           31700                           CA       LATVEL                                
039688,000456: 21,2770           00006                           EXTEND                                         
039689,000457: 21,2771           63020                           BZMF     LVMINLM                               
039690,000458: 21,2772           50065                           INDEX    ITEMP5                                
039691,000459: 21,2773           41676                           CS       LATVMETR                              
039692,000460: 21,2774           13024                           TCF      ZEROLSTY                              
039693,000461: 21,2775           50065        NEGLMLV            INDEX    ITEMP5                                
039694,000462: 21,2776           31700                           CA       LATVEL                                
039695,000463: 21,2777           00006                           EXTEND                                         
039696,000464: 21,3000           63020                           BZMF     LVMINLM                               
039697,000465: 21,3001           32005                           CA       MAXVBITS                              
039698,000466: 21,3002           50065                           INDEX    ITEMP5                                
039699,000467: 21,3003           61676                           AD       LATVMETR                              
039700,000468: 21,3004           40000                           COM                                            
039701,000469: 21,3005           50065                           INDEX    ITEMP5                                
039702,000470: 21,3006           61700                           AD       LATVEL                                
039703,000471: 21,3007           00006                           EXTEND                                         
039704,000472: 21,3010           63020                           BZMF     LVMINLM                               
039705,000473: 21,3011           00006                           EXTEND                                         
039706,000474: 21,3012           50065                           INDEX    ITEMP5                                
039707,000475: 21,3013           61700                           SU       LATVEL                                
039708,000476: 21,3014           50065                           INDEX    ITEMP5                                
039709,000477: 21,3015           61676                           AD       LATVMETR                              
039710,000478: 21,3016           40000                           COM                                            
039711,000479: 21,3017           13024                           TCF      ZEROLSTY                              
039712,000480: 21,3020           50065        LVMINLM            INDEX    ITEMP5                                
039713,000481: 21,3021           41676                           CS       LATVMETR                              
039714,000482: 21,3022           50065                           INDEX    ITEMP5                                
039715,000483: 21,3023           61700                           AD       LATVEL                                
039716,000484: 21,3024           50065        ZEROLSTY           INDEX    ITEMP5                                
039717,000485: 21,3025           56072                           XCH      RUPTREG3                              
039718,000486: 21,3026           34755                           CAF      ZERO                                  
039719,000487: 21,3027           50065                           INDEX    ITEMP5                                
039720,000488: 21,3030           55702                           TS       TRAKLATV                              
039721,000489: 21,3031           50065                           INDEX    ITEMP5                                
039722,000490: 21,3032           30072                           CA       RUPTREG3                              
039723,000491: 21,3033           64754                           AD       NEG0                                  #  AVOIDS +0 DINC HARDWARE MALFUNCTION

Page 907

039725,000493: 21,3034           50065                           INDEX    ITEMP5                                
039726,000494: 21,3035           54053                           TS       CDUTCMD                               
039727,000495: 21,3036           50065                           INDEX    ITEMP5                                
039728,000496: 21,3037           30072                           CA       RUPTREG3                              
039729,000497: 21,3040           50065                           INDEX    ITEMP5                                
039730,000498: 21,3041           27676                           ADS      LATVMETR                              
039731,000499: 21,3042           10065                           CCS      ITEMP5                                #  FIRST MONITOR FORWARD THEN LATERAL VEL.
039732,000500: 21,3043           12620                           TCF      VMONITOR                              
039733,000501: 
039734,000502: 21,3044           35020                           CAF      BITSET                                #  DRIVE THE X-POINTER DISPLAY.
039735,000503: 21,3045           00006                           EXTEND                                         
039736,000504: 21,3046           05014                           WOR      CHAN14                                
039737,000505: 21,3047           01714                           TC       LADQSAVE                              #  GO TO ALTROUT +1 OR TO ALTOUT +1
039738,000506: 21,3050           34755        ZERODATA           CAF      ZERO                                  #  ZERO ALTSAVE AND ALTSAVE +1 - - -
039739,000507: 21,3051           54001                           TS       L                                     #        NO NEGATIVE ALTITUDES ALLOWED.
039740,000508: 21,3052           12270                           TCF      ZDATA2                                
039741,000509: 
039742,000510:                                                                                                  #  ************************************************************************
039743,000511: 
039744,000512: 21,3053           40074        DISPRSET           CS       FLAGWRD0                              #  ARE WE IN DESCENT TRAJECTORY?
039745,000513: 21,3054           74752                           MASK     R10FLBIT                              
039746,000514: 21,3055           00006                           EXTEND                                         
039747,000515: 21,3056           13067                           BZF      ABORTON                               #  NO.
039748,000516: 21,3057           34744                           CAF      BIT8                                  #  YES.
039749,000517: 21,3060           71303                           MASK     IMODES33                              #  CHECK IF INERTIAL DATA JUST DISPLAYED.
039750,000518: 21,3061           10000                           CCS      A                                     
039751,000519: 21,3062           34752                           CAF      BIT2                                  #  YES. DISABLE RR ERROR COUNTER
039752,000520: 21,3063           64744                           AD       BIT8                                  #  NO.  REMOVE DISPLAY INERTIAL DATA
039753,000521: 21,3064           40000                           COM                                            
039754,000522: 21,3065           00006                           EXTEND                                         
039755,000523: 21,3066           03012                           WAND     CHAN12                                
039756,000524: 21,3067           43076        ABORTON            CS       BITS8/7                               #  RESET INERTIAL DATA, INTERLEAVE FLAGS.
039757,000525: 21,3070           71303                           MASK     IMODES33                              
039758,000526: 21,3071           55303                           TS       IMODES33                              
039759,000527: 21,3072           44736                           CS       DIDFLBIT                              
039760,000528: 21,3073           70075                           MASK     FLAGWRD1                              
039761,000529: 21,3074           54075                           TS       FLAGWRD1                              #  RESET DIDFLAG.
039762,000530: 21,3075           15261                           TCF      TASKOVER                              
039763,000531: 
039764,000532:                                                                                                  #  ************************************************************************
039765,000533: 
039766,000534: 21,3076           00300        BITS8/7            OCT      00300                                 #  INERTIAL DATA AND INTERLEAVE FLAGS.
039767,000535: 21,3077     5020               BITSET             =        PRIO6                                 
039768,000536: 
039769,000537:                                                                                                  #  ************************************************************************
039770,000538: 
039771,000539: 

End of include-file LANDING_ANALOG_DISPLAYS.agc.  Parent file is MAIN.agc