Source Code

These source-code files are part of a reconstructed copy of Comanche 44, the initial release (though not the final mission release) of the Apollo 10 Command Module (CM) Apollo Guidance Computer (AGC) software. Subsequent releases were Comanche 45 and Comanche 45/2 (the flown release on Apollo 10). The reconstruction is believed to be exactly accurate, but in the absence of an actual Apollo-era listing of Comanche 44, some explanation of the reconstruction process is needed to insure confidence in that accuracy.

The starting point was the source code of Comanche 51 (separately previously reconstructed from an Apollo-era listing of Comanche 55, flown on Apollo 11). Comanche 51 source code was then modified by undoing changes known to have been made between revisions 44 and 51. The now-reconstructed Comanche 44 source code was verified by assembling it and checking that the assembled code had the expected known-correct memory-bank checksums. Note that page numbers in the reconstructed code match those on the Comanche 55 printout, although the source code would likely have different page numbers in a contemporary Comanche 44 listing.

Annotations that were not present in the contemporary source code have been added to the reconstructed code to justify each change relative to Comanche 51. Here's a guide to the Apollo documentation referenced in those annotations:
In most cases, only the titles (rather than the full texts) of PCRs are known. In addition to the explanatory annotations, there is also a step-by-step commentary about the reconstruction process.

Comments expected to have been present in the original source code are prefixed with a single '#' symbol, whereas comments added later are prefixed by "##" or "###". Report any errors noted by creating an issue report at the Virtual AGC Project's GitHub repository.

012290,000002:                                                                                                  ## Copyright:   Public domain.
012291,000003:                                                                                                  ## Filename:    CSM_GEOMETRY.agc
012292,000004:                                                                                                  ## Purpose:     A section of Comanche revision 044.
012293,000005:                                                                                                  ##              It is part of the reconstructed source code for the
012294,000006:                                                                                                  ##              original release of the flight software for the Command
012295,000007:                                                                                                  ##              Module's (CM) Apollo Guidance Computer (AGC) for Apollo 10.
012296,000008:                                                                                                  ##              The code has been recreated from a copy of Comanche 055. It
012297,000009:                                                                                                  ##              has been adapted such that the resulting bugger words
012298,000010:                                                                                                  ##              exactly match those specified for Comanche 44 in NASA drawing
012299,000011:                                                                                                  ##              2021153D, which gives relatively high confidence that the
012300,000012:                                                                                                  ##              reconstruction is correct.
012301,000013:                                                                                                  ## Assembler:   yaYUL
012302,000014:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
012303,000015:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
012304,000016:                                                                                                  ## Mod history: 2020-12-03 MAS  Created from Comanche 51.
012305,000017: 

Page 285

012307,000019: 22,2000                                           BANK     22                                    
012308,000020: 23,2000                                           SETLOC   COMGEOM1                              
012309,000021: 23,2000                                           BANK                                           
012310,000022: 
012311,000023:                                                                                                  #  THIS ROUTINE TAKES THE SHAFT AND TRUNNION ANGLES AS READ BY THE CM OPTICAL SYSTEM AND CONVERTS THEM INTO A UNIT
012312,000024:                                                                                                  #  VECTOR REFERENCED TO THE NAVIGATION BASE COORDINATE SYSTEM AND COINCIDENT WITH THE SEXTANT LINE OF SIGHT.
012313,000025: 
012314,000026:                                                                                                  #  THE INPUTS ARE  1) THE SEXTANT SHAFT AND TRUNNION ANGLES ARE STORED SP IN LOCATIONS 3 AND 5 RESPECTIVELY OF THE
012315,000027:                                                                                                  #  MARK VAC AREA.  2) THE COMPLEMENT OF THE BASE ADDRESS OF THE MARK VAC AREA IS STORED SP AT LOCATION X1 OF YOUR
012316,000028:                                                                                                  #  JOB VAC AREA.
012317,000029: 
012318,000030:                                                                                                  #  THE OUTPUT IS A HALF-UNIT VECTOR IN NAVIGATION BASE COORDINATES AND STORED AT LOCATION 32D OF THE VAC AREA. THE
012319,000031:                                                                                                  #  OUTPUT IS ALSO AVAILABLE AT MPAC.
012320,000032: 
012321,000033: 23,2000                                           COUNT    23/GEOM                               
012322,000034: 
012323,000035: 23,2000           47133        SXTNB              SLOAD*   RTB                                   #  PUSHDOWN 00,02,04,(17D-19D),32D-36D
012324,000036: 23,2001           00006                                    5,1                                   #  TRUNNION = TA
012325,000037: 23,2002           45513                                    CDULOGIC                              
012326,000038: 23,2003           41434                           RTB      PUSH                                  
012327,000039: 23,2004           46027                                    SXTLOGIC                              
012328,000040: 23,2005           72556                           SIN      SL1                                   
012329,000041: 23,2006           66606                           PUSH     SLOAD*                                #  PD2 = SIN(TA)
012330,000042: 23,2007           00004                                    3,1                                   #  SHAFT = SA
012331,000043: 23,2010           41434                           RTB      PUSH                                  #  PD4 = SA
012332,000044: 23,2011           45513                                    CDULOGIC                              
012333,000045: 
012334,000046: 23,2012           41346                           COS      DMP                                   
012335,000047: 23,2013           00003                                    2                                     
012336,000048: 23,2014           14041                           STODL    STARM                                 #  COS(SA)SIN(TA)
012337,000049: 
012338,000050: 23,2015           41356                           SIN      DMP                                   
012339,000051: 23,2016           77626                           STADR                                          
012340,000052: 23,2017           63734                           STODL    STARM      +2                         #  SIN(SA)SIN(TA)
012341,000053: 
012342,000054: 23,2020           77746                           COS                                            
012343,000055: 23,2021           24045                           STOVL    STARM      +4                         
012344,000056: 23,2022           00041                                    STARM                                 #  STARM = 32D
012345,000057: 23,2023           76521                           MXV      VSL1                                  
012346,000058: 23,2024           06302                                    NB1NB2                                
012347,000059: 23,2025           00041                           STORE    32D                                   
012348,000060: 23,2026           77616                           RVQ                                            
012349,000061: 
012350,000062: 23,2027           32323        SXTLOGIC           CAF      10DEGS-                               #  CORRECT FOR 19.775 DEGREE OFFSET
012351,000063: 23,2030           26154                           ADS      MPAC                                  
012352,000064: 23,2031           35003                           CAF      QUARTER                               
012353,000065: 23,2032           07256                           TC       SHORTMP                               
012354,000066: 23,2033           06030                           TC       DANZIG                                
012355,000067: 

Page 286

012357,000069:                                                                                                  #  CALCSXA COMPUTES THE SEXTANT SHAFT AND TRUNNION ANGLES REQUIRED TO POSITION THE OPTICS SUCH THAT A STAR LINE-
012358,000070:                                                                                                  #  OF-SIGHT LIES ALONG THE STAR VECTOR.  THE ROUTINE TAKES THE GIVEN STAR VECTOR AND EXPRESSES IT AS A VECTOR REF-
012359,000071:                                                                                                  #  ERENCED TO THE OPTICS COORDINATE SYSTEM.  IN ADDITION IT SETS UP THREE UNIT VECTORS DEFINING THE X, Y, AND Z AXES
012360,000072:                                                                                                  #  REFERENCED TO THE OPTICS COORDINATE SYSTEM.
012361,000073: 
012362,000074:                                                                                                  #  THE INPUTS ARE  1) THE STAR VECTOR REFERRED TO PRESENT STABLE MEMBER COORDINATES STORED AT STAR.  2) SAME ANGLE
012363,000075:                                                                                                  #  INPUT AS *SMNB*, I.E. SINES AND COSINES OF THE CDU ANGLES, IN THE ORDER Y Z X, AT SINCDU AND COSCDU.  A CALL
012364,000076:                                                                                                  #  TO CDUTRIG WILL PROVIDE THIS INPUT.
012365,000077: 
012366,000078:                                                                                                  #  THE OUTPUTS ARE THE SEXTANT SHAFT AND TRUNNION ANGLES STORED DP AT SAC AND PAC RESPECTIVELY.  (LOW ORDER PART
012367,000079:                                                                                                  #  EQUAL TO ZERO).
012368,000080: 
012369,000081: 23,2034           77220        CALCSXA            ITA      VLOAD                                 #  PUSHDOWN 00-26D, 28D, 30D, 32D-36D
012370,000082: 23,2035           00034                                    28D                                   
012371,000083: 23,2036           02766                                    STAR                                  
012372,000084: 23,2037           77624                           CALL                                           
012373,000085: 23,2040           47644                                    *SMNB*                                
012374,000086: 23,2041           76521                           MXV      VSL1                                  
012375,000087: 23,2042           06260                                    NB2NB1                                
012376,000088: 23,2043           26766                           STOVL    STAR                                  
012377,000089: 23,2044           15333                                    HIUNITX                               
012378,000090: 23,2045           26555                           STOVL    XNB1                                  
012379,000091: 23,2046           15331                                    HIUNITY                               
012380,000092: 23,2047           26563                           STOVL    YNB1                                  
012381,000093: 23,2050           15327                                    HIUNITZ                               
012382,000094: 23,2051           36571                           STCALL   ZNB1                                  
012383,000095: 23,2052           46076                                    SXTANG1                               
012384,000096: 

Page 287

012386,000098:                                                                                                  #  SXTANG COMPUTES THE SEXTANT SHAFT AND TRUNNION ANGLES REQUIRED TO POSITION THE OPTICS SUCH THAT A STAR LINE-OF-
012387,000099:                                                                                                  #  SIGHT LIES ALONG THE STAR VECTOR.
012388,000100: 
012389,000101:                                                                                                  #  THE INPUTS ARE  1) THE STAR VECTOR REFERRED TO ANY COORDINATE SYSTEM STORED AT STAR.  2) THE NAVIGATION BASE
012390,000102:                                                                                                  #  COORDINATES REFERRED TO THE SAME COORDINATE SYSTEM.  THESE THREE HALF-UNIT VECTORS ARE STORED AT XNB, YNB,AND
012391,000103:                                                                                                  #  ZNB.
012392,000104: 
012393,000105:                                                                                                  #  THE OUTPUTS ARE THE SEXTANT SHAFT AND TRUNNION ANGLES STORED DP AT SAC AND PAC RESPECTIVELY.  (LOW ORDER PART
012394,000106:                                                                                                  #  EQUAL TO ZERO).
012395,000107: 
012396,000108: 23,2053           47020        SXTANG             ITA      RTB                                   #  PUSHDOWN 16D,18D,22D-26D,28D
012397,000109: 23,2054           00034                                    28D                                   
012398,000110: 23,2055           45662                                    TRANSP1                               #  EREF WRT NB2
012399,000111: 23,2056           64375                           VLOAD    MXV                                   
012400,000112: 23,2057           02714                                    XNB                                   
012401,000113: 23,2060           06260                                    NB2NB1                                
012402,000114: 23,2061           77772                           VSL1                                           
012403,000115: 23,2062           26555                           STOVL    XNB1                                  
012404,000116: 23,2063           02722                                    YNB                                   
012405,000117: 23,2064           76521                           MXV      VSL1                                  
012406,000118: 23,2065           06260                                    NB2NB1                                
012407,000119: 23,2066           26563                           STOVL    YNB1                                  
012408,000120: 23,2067           02730                                    ZNB                                   
012409,000121: 23,2070           76521                           MXV      VSL1                                  
012410,000122: 23,2071           06260                                    NB2NB1                                
012411,000123: 23,2072           02571                           STORE    ZNB1                                  
012412,000124: 
012413,000125: 23,2073           47034                           RTB      RTB                                   
012414,000126: 23,2074           45662                                    TRANSP1                               
012415,000127: 23,2075           45676                                    TRANSP2                               
012416,000128: 
012417,000129: 23,2076           47375        SXTANG1            VLOAD    VXV                                   
012418,000130: 23,2077           02571                                    ZNB1                                  
012419,000131: 23,2100           02766                                    STAR                                  
012420,000132: 23,2101           77600                           BOV                                            
012421,000133: 23,2102           46103                                    +1                                    
012422,000134: 23,2103           40056                           UNIT     BOV                                   
012423,000135: 23,2104           46145                                    ZNB=S1                                
012424,000136: 23,2105           00027                           STORE    PDA                                   #  PDA = UNIT(ZNB X S)
012425,000137: 
012426,000138: 23,2106           57441                           DOT      DCOMP                                 
012427,000139: 23,2107           02555                                    XNB1                                  
012428,000140: 23,2110           24023                           STOVL    SINTH                                 #  SIN(SA) = PDA . -XNB
012429,000141: 23,2111           00027                                    PDA                                   
012430,000142: 
012431,000143: 23,2112           77641                           DOT                                            
012432,000144: 23,2113           02563                                    YNB1                                  
012433,000145: 23,2114           34021                           STCALL   COSTH                                 #  COS(SA) = PDA . YNB
012434,000146: 23,2115           47256                                    ARCTRIG                               

Page 288

012436,000148: 23,2116           77634                           RTB                                            
012437,000149: 23,2117           45546                                    1STO2S                                
012438,000150: 23,2120           26774                           STOVL    SAC                                   
012439,000151: 23,2121           02766                                    STAR                                  
012440,000152: 23,2122           77600                           BOV                                            
012441,000153: 23,2123           46124                                    +1                                    
012442,000154: 23,2124           72441                           DOT      SL1                                   
012443,000155: 23,2125           02571                                    ZNB1                                  
012444,000156: 23,2126           77726                           ACOS                                           
012445,000157: 23,2127           62440                           BMN      SL2                                   
012446,000158: 23,2130           46142                                    SXTALARM                              #  TRUNNION ANGLE NEGATIVE
012447,000159: 23,2131           45200                           BOV      DSU                                   
012448,000160: 23,2132           46142                                    SXTALARM                              #  TRUNNION ANGLE GREATER THAN 90 DEGREES
012449,000161: 23,2133           06331                                    20DEG-                                
012450,000162: 23,2134           77634                           RTB                                            
012451,000163: 23,2135           45546                                    1STO2S                                
012452,000164: 23,2136           02776                           STORE    PAC                                   #  FOR FLIGHT USE, CULTFLAG IS ON IF
012453,000165: 23,2137           77614                           CLRGO                                          #  TRUNION IS GREATER THAN 90 DEG
012454,000166: 23,2140           01630                                    CULTFLAG                              
012455,000167: 23,2141           00034                                    28D                                   
012456,000168: 23,2142           77614        SXTALARM           SETGO                                          #  ALARM HAS BEEN REMOVED FROM THIS
012457,000169: 23,2143           01430                                    CULTFLAG                              
012458,000170: 23,2144           00034                                    28D                                   #  SUBROUTINE, ALARM WILL BE SET BY MPI
012459,000171: 23,2145           77745        ZNB=S1             DLOAD                                          
012460,000172: 23,2146           06325                                    270DEG                                
012461,000173: 23,2147           16774                           STODL    SAC                                   
012462,000174: 23,2150           06327                                    20DEGS-                               
012463,000175: 23,2151           02776                           STORE    PAC                                   
012464,000176: 23,2152           77614                           CLRGO                                          
012465,000177: 23,2153           01630                                    CULTFLAG                              
012466,000178: 23,2154           00034                                    28D                                   
012467,000179: 

Page 289

012469,000181:                                                                                                  #  THESE TWO ROUTINES COMPUTE THE ACTUAL STATE VECTOR FOR LM, CSM BY ADDING
012470,000182:                                                                                                  #  THE CONIC R,V AND THE DEVIATIONS R,V.  THE STATE VECTORS ARE CONVERTED TO
012471,000183:                                                                                                  #  METERS B-29 AND METERS/CSEC B-7 AND STORED APPROPRIATELY IN RN,VN OR
012472,000184:                                                                                                  #  R-OTHER, V-OTHER FOR DOWNLINK.  THE ROUTINES NAMES ARE SWITCHED IN THE
012473,000185:                                                                                                  #  OTHER VEHICLES COMPUTER.
012474,000186: 
012475,000187:                                                                                                  #  INPUT
012476,000188:                                                                                                  #        STATE VECTOR IN TEMPORARY STORAGE AREA
012477,000189:                                                                                                  #        IF STATE VECTOR IS SCALED POS B27 AND VEL B5
012478,000190:                                                                                                  #                SET X2 TO +2
012479,000191:                                                                                                  #        IF STATE VECTOR IS SCALED POS B29 AND VEL B7
012480,000192:                                                                                                  #                SET X2 TO 0
012481,000193: 
012482,000194:                                                                                                  #  OUTPUT
012483,000195:                                                                                                  #        R(T) IN RN, V(T) IN VN, T IN PIPTIME
012484,000196:                                                                                                  #                OR
012485,000197:                                                                                                  #        R(T) IN R-OTHER, V(T) IN V-OTHER        (T IS DEFINED BY T-OTHER)
012486,000198: 
012487,000199: 23,2155                                           BANK     23                                    
012488,000200: 10,2000                                           SETLOC   COMGEOM2                              
012489,000201: 10,2000                                           BANK                                           
012490,000202: 10,2237                                           COUNT    10/GEOM                               
012491,000203: 10,2237           43414        SVDWN1             BOF      RVQ                                   #  SW=1=AVETOMID DOING W-MATRIX INTEG
012492,000204: 10,2240           04756                                    AVEMIDSW                              
012493,000205: 10,2241           20242                                    +1                                    
012494,000206: 10,2242           53775                           VLOAD    VSL*                                  
012495,000207: 10,2243           01521                                    TDELTAV                               
012496,000208: 10,2244           57605                                    0          -7,2                       
012497,000209: 10,2245           53655                           VAD      VSL*                                  
012498,000210: 10,2246           01535                                    RCV                                   
012499,000211: 10,2247           57576                                    0,2                                   
012500,000212: 10,2250           25171                           STOVL    RN                                    
012501,000213: 10,2251           01527                                    TNUV                                  
012502,000214: 10,2252           53257                           VSL*     VAD                                   
012503,000215: 10,2253           57602                                    0          -4,2                       
012504,000216: 10,2254           01543                                    VCV                                   
012505,000217: 10,2255           77657                           VSL*                                           
012506,000218: 10,2256           57576                                    0,2                                   
012507,000219: 10,2257           15177                           STODL    VN                                    
012508,000220: 10,2260           01517                                    TET                                   
012509,000221: 10,2261           01205                           STORE    PIPTIME                               
012510,000222: 10,2262           77616                           RVQ                                            
012511,000223: 
012512,000224: 10,2263           53775        SVDWN2             VLOAD    VSL*                                  
012513,000225: 10,2264           01521                                    TDELTAV                               
012514,000226: 10,2265           57605                                    0          -7,2                       
012515,000227: 10,2266           53655                           VAD      VSL*                                  
012516,000228: 10,2267           01535                                    RCV                                   

Page 290

012518,000230: 10,2270           57576                                    0,2                                   
012519,000231: 10,2271           25722                           STOVL    R-OTHER                               
012520,000232: 10,2272           01527                                    TNUV                                  
012521,000233: 10,2273           53257                           VSL*     VAD                                   
012522,000234: 10,2274           57602                                    0          -4,2                       
012523,000235: 10,2275           01543                                    VCV                                   
012524,000236: 10,2276           77657                           VSL*                                           
012525,000237: 10,2277           57576                                    0,2                                   
012526,000238: 10,2300           01730                           STORE    V-OTHER                               
012527,000239: 10,2301           77616                           RVQ                                            
012528,000240: 

Page 291

012530,000242:                                                                                                  #  SUBROUTINE TO COMPUTE THE NATURAL LOG OF C(MPAC, MPAC +1).
012531,000243: 
012532,000244:                                                                                                  #        ENTRY:  CALL
012533,000245:                                                                                                  #                        LOG
012534,000246: 
012535,000247:                                                                                                  #  SUBROUTINE RETURNS WITH -LOG IN DP MPAC.
012536,000248: 
012537,000249:                                                                                                  #  EBANK IS ARBITRARY..
012538,000250: 
012539,000251: 14,2000                                           BANK     14                                    
012540,000252: 23,2000                                           SETLOC   POWFLIT2                              
012541,000253: 23,2000                                           BANK                                           
012542,000254: 23,2155                                           COUNT    23/GEOM                               
012543,000255: 
012544,000256: 23,2155           44301        LOG                NORM     BDSU                                  #  GENERATES LOG BY SHIFTING ARG
012545,000257: 23,2156           00160                                    MPAC       +3                         #  UNTIL IT LIES BETWEEN .5 AND 1.
012546,000258: 23,2157           06212                                    NEARLY1                               #  THE LOG OF THIS PART IS FOUND AND THE
012547,000259: 23,2160           77776                           EXIT                                           #  LOG OF THE SHIFTED PART IS COMPUTED
012548,000260: 23,2161           07171                           TC       POLY                                  #  AND ADDED IN.  SHIFT COUNT STORED
012549,000261: 23,2162           00002                           DEC      2          B-14                       #  (N-1, SUPPLIED BY SMERZH)
012550,000262: 23,2163           00000 00000                     2DEC     0          B-28                       #  IN MPAC +3.
012551,000263: 23,2165           01001 14636                     2DEC     .031335467                            
012552,000264: 23,2167           00325 07310                     2DEC     .0130145859                            
012553,000265: 23,2171           00541 16735                     2DEC     .0215738898                            
012554,000266: 
012555,000267: 23,2173           35021                           CAF      ZERO                                  
012556,000268: 23,2174           54156                           TS       MPAC       +2                         
012557,000269: 23,2175           00006                           EXTEND                                         
012558,000270: 23,2176           32214                           DCA      CLOG2/32                              
012559,000271: 23,2177           52155                           DXCH     MPAC                                  
012560,000272: 23,2200           52160                           DXCH     MPAC       +3                         
012561,000273: 23,2201           40000                           COM                                            #  LOAD POSITIVE SHIFT COUNT IN A.
012562,000274: 23,2202           07256                           TC       SHORTMP                               #  MULTIPLY BY SHIFT COUNT.
012563,000275: 
012564,000276: 23,2203           52156                           DXCH     MPAC       +1                         
012565,000277: 23,2204           52155                           DXCH     MPAC                                  
012566,000278: 23,2205           52160                           DXCH     MPAC       +3                         
012567,000279: 23,2206           20155                           DAS      MPAC                                  
012568,000280: 23,2207           06006                           TC       INTPRET                               #  RESULT IN MPAC, MPAC +1
012569,000281: 
012570,000282: 23,2210           77616                           RVQ                                            
012571,000283: 
012572,000284: 23,2211           37777 37777  NEARLY1            2DEC     .999999999                            
012573,000285: 

Page 292

012575,000287: 23,2213           00542 34414  CLOG2/32           2DEC     .0216608494                            
012576,000288: 

Page 293

012578,000290:                                                                                                  #  SUBROUTINE NAME:  EARTH ROTATOR       (EARROT1 OR EARROT2)            DATE:  15 FEB 67
012579,000291:                                                                                                  #  MOD NO:  N +1                                                         LOG SECTION:  POWERED FLIGHT SUBROS
012580,000292:                                                                                                  #  MOD BY:  ENTRY GROUP (BAIRNSFATHER)
012581,000293: 
012582,000294:                                                                                                  #  FUNCTIONAL DESCRIPTION:  THIS ROUTINE PROJECTS THE INITIAL EARTH TARGET VECTOR RTINIT AHEAD THROUGH
012583,000295:                                                                                                  #        THE ESTIMATED TIME OF FLIGHT.  INITIAL CALL RESOLVES THE INITIAL TARGET VECTOR RTINIT INTO EASTERLY
012584,000296:                                                                                                  #        AND NORMAL COMPONENTS RTEAST AND RTNORM.  INITIAL AND SUBSEQUENT CALLS ROTATE THIS VECTOR
012585,000297:                                                                                                  #        ABOUT THE (FULL) UNIT POLAR AXIS UNITW THROUGH THE ANGLE  WIE DTEAROT  TO OBTAIN THE ROTATED
012586,000298:                                                                                                  #        TARGET VECTOR RT.  ALL VECTORS EXCEPT UNITW ARE HALF UNIT.
012587,000299:                                                                                                  #        THE EQUATIONS ARE
012588,000300:                                                                                                  #                -    -        -                      -
012589,000301:                                                                                                  #                RT = RTINIT + RTNORM (COS(WT) - 1) + RTEAST SIN(WT)
012590,000302: 
012591,000303:                                                                                                  #        WHERE   WT = WIE DTEAROT
012592,000304: 
012593,000305:                                                                                                  #                RTINIT = INITIAL TARGET VECTOR
012594,000306:                                                                                                  #                -        -       -
012595,000307:                                                                                                  #                RTEAST = UNITW * RTINIT
012596,000308:                                                                                                  #                -        -        -
012597,000309:                                                                                                  #                RTNORM = RTEAST * UNITW
012598,000310: 
012599,000311:                                                                                                  #        FOR CONTINUOUS UPDATING, ONLY ONE ENTRY TO EARROT1 IS REQUIRED, WITH SUBSEQUENT ENTRIES AT EARROT2.
012600,000312:                                                                                                  #        
012601,000313:                                                                                                  #  CALLING SEQUENCE:     FIRST CALL                      SUBSEQUENT CALL
012602,000314:                                                                                                  #                        STCALL  DTEAROT                 STCALL  DTEAROT
012603,000315:                                                                                                  #                                EARROT1                         EARROT2
012604,000316:                                                                                                  #                        C(MPAC) UNSPECIFIED             C(MPAC) = DTEAROT
012605,000317:                                                                                                  #        PUSHLOC = PDL+0, ARBITRARY.  6 LOCATIONS USED.
012606,000318: 
012607,000319:                                                                                                  #  SUBROUTINES USED:  NONE
012608,000320: 
012609,000321:                                                                                                  #  NORMAL EXIT MODES:  RVQ
012610,000322: 
012611,000323:                                                                                                  #  ALARMS:  NONE
012612,000324: 
012613,000325:                                                                                                  #  OUTPUT:       RTEAST  (-1)            .5 UNIT VECTOR EAST, COMPNT OF RTINIT   LEFT BY FIRST CALL
012614,000326:                                                                                                  #                RTNORM  (-1)            .5 UNIT VECTOR NORML, COMPNT OF RTINIT  LEFT BY FIRST CALL
012615,000327:                                                                                                  #                RT      (-1)            .5 UNIT TARGET VECTOR, ROTATED          LEFT BY ALL CALLS
012616,000328:                                                                                                  #                DTEAROT (-28) CS        MAY BE CHANGED BY EARROT2, IF OVER 1 DAY
012617,000329: 
012618,000330:                                                                                                  #  ERASABLE INITIALIZATION REQUIRED:
012619,000331:                                                                                                  #                UNITW   (0)             UNIT POLAR VECTOR                       PAD LOADED
012620,000332:                                                                                                  #                RTINIT  (-1)            .5 UNIT INITIAL TARGET VECTOR           LEFT BY ENTRY
012621,000333:                                                                                                  #                DTEAROT (-28) CS        TIME OF FLIGHT                          LEFT BY CALLER
012622,000334: 
012623,000335:                                                                                                  #  DEBRIS:  QPRET, PDL+0 ... PDL+5

Page 294

012625,000337: 23,2215  E7,1451                                  EBANK=   RTINIT                                
012626,000338: 
012627,000339: 23,2215           47375        EARROT1            VLOAD    VXV                                   
012628,000340: 23,2216           01714                                    UNITW                                 #  FULL UNIT VECTOR
012629,000341: 23,2217           03452                                    RTINIT                                #  .5 UNIT
012630,000342: 23,2220           03460                           STORE    RTEAST                                #  .5 UNIT
012631,000343: 
012632,000344: 23,2221           77635                           VXV                                            
012633,000345: 23,2222           01714                                    UNITW                                 #  FULL UNIT
012634,000346: 23,2223           17466                           STODL    RTNORM                                #  .5 UNIT
012635,000347: 23,2224           03606                                    DTEAROT                               #  (-28) CS
012636,000348: 
012637,000349: 23,2225           56204        EARROT2            BOVB     DDV                                   
012638,000350: 23,2226           57352                                    TCDANZIG                              #  RESET OVFIND, IF ON
012639,000351: 23,2227           06256                                    1/WIE                                 
012640,000352: 23,2230           41400                           BOV      PUSH                                  
012641,000353: 23,2231           46245                                    OVERADAY                              
012642,000354: 23,2232           45346                           COS      DSU                                   
012643,000355: 23,2233           15333                                    HIDPHALF                              
012644,000356: 23,2234           65361                           VXSC     PDDL                                  #  XCH W PUSH LIST
012645,000357: 23,2235           03466                                    RTNORM                                #  .5 UNIT
012646,000358: 23,2236           74356                           SIN      VXSC                                  
012647,000359: 23,2237           03460                                    RTEAST                                #  .5 UNIT
012648,000360: 23,2240           76455                           VAD      VSL1                                  
012649,000361: 23,2241           53455                           VAD      UNIT                                  #  INSURE THAT RT IS 'UNIT'.
012650,000362: 23,2242           03452                                    RTINIT                                #  .5 UNIT
012651,000363: 23,2243           03474                           STORE    RT                                    #  .5 UNIT TARGET VECTOR
012652,000364: 
012653,000365: 23,2244           77616                           RVQ                                            
012654,000366: 
012655,000367: 23,2245           75345        OVERADAY           DLOAD    SIGN                                  
012656,000368: 23,2246           06256                                    1/WIE                                 
012657,000369: 23,2247           03606                                    DTEAROT                               
012658,000370: 23,2250           77621                           BDSU                                           
012659,000371: 23,2251           03606                                    DTEAROT                               
012660,000372: 23,2252           03606                           STORE    DTEAROT                               
012661,000373: 
012662,000374: 23,2253           77650                           GOTO                                           
012663,000375: 23,2254           46225                                    EARROT2                               
012664,000376: 
012665,000377:                                                                                                  # WIE            2DEC    .1901487997
012666,000378: 23,2255           01015 34732  1/WIE              2DEC     8616410    B-28                       
012667,000379: 23,2257           15373 11346  NB2NB1             2DEC     +.8431756920 B-1                        
012668,000380: 23,2261           00000 00000                     2DEC     0          B-28                       
012669,000381: 23,2263           67313 65307                     2DEC     -.5376381241 B-1                        

Page 295

012671,000383: 23,2265           00000 00000  ZERINFLT           2DEC     0          B-28                       
012672,000384: 23,2267           20000 00000  HALFNFLT           2DEC     .5                                    
012673,000385: 23,2271           00000 00000                     2DEC     0          B-28                       
012674,000386: 23,2273           10464 12470                     2DEC     +.5376381241 B-1                        
012675,000387: 23,2275           00000 00000                     2DEC     0          B-28                       
012676,000388: 23,2277           15373 11346                     2DEC     +.8431756920 B-1                        
012677,000389: 23,2301           15373 11346  NB1NB2             2DEC     +.8431756920 B-1                        
012678,000390: 23,2303           00000 00000                     2DEC     0          B-28                       
012679,000391: 23,2305           10464 12470                     2DEC     +.5376381241 B-1                        
012680,000392: 23,2307           00000 00000                     2DEC     0          B-28                       
012681,000393: 23,2311           20000 00000                     2DEC     .5                                    
012682,000394: 23,2313           00000 00000                     2DEC     0          B-28                       
012683,000395: 23,2315           67313 65307                     2DEC     -.5376381241 B-1                        
012684,000396: 23,2317           00000 00000                     2DEC     0          B-28                       
012685,000397: 23,2321           15373 11346                     2DEC     +.8431756920 B-1                        

Page 296

012687,000399: 23,2323           07020        10DEGS-            DEC      3600       B-14                       
012688,000400: 23,2324           60000        270DEG             OCT      60000                                 #  SHAFT 270 DEGREES     2S COMP.
012689,000401: 23,2325           00000                           OCT      00000                                 
012690,000402: 23,2326           61740        20DEGS-            DEC      -07199     B-14                       
012691,000403: 23,2327           77777                           DEC      -00000     B-14                       
012692,000404: 23,2330           07020        20DEG-             DEC      03600      B-14                       
012693,000405: 23,2331           00000                           DEC      00000      B-14                       
012694,000406: 

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