Source Code

These source-code files are part of a reconstructed copy of Luminary 163, the first (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance Computer (AGC) software.

The reconstruction began with reconstructed source code for Luminary 173. Changes between revision 163 and 173 were backed out, as described by Luminary memos 157 and 158. The reconstruction was verified by matching memory-bank checksums to those listed in drawing 2021152N. Note that page numbers in the reconstructed code match those for the baseline log section mentioned in each file's changelog; the page numbers for a real Luminary 163 listing would be different.

Comments from 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.

030247,000002:                                                                                                  ## Copyright:   Public domain.
030248,000003:                                                                                                  ## Filename:    P76.agc
030249,000004:                                                                                                  ## Purpose:     A section of Luminary revision 163.
030250,000005:                                                                                                  ##              It is part of the reconstructed source code for the first
030251,000006:                                                                                                  ##              (unflown) release of the flight software for the Lunar
030252,000007:                                                                                                  ##              Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
030253,000008:                                                                                                  ##              The code has been recreated from a reconstructed copy of
030254,000009:                                                                                                  ##              Luminary 173, as well as Luminary memos 157 amd 158.
030255,000010:                                                                                                  ##              It has been adapted such that the resulting bugger words
030256,000011:                                                                                                  ##              exactly match those specified for Luminary 163 in NASA
030257,000012:                                                                                                  ##              drawing 2021152N, which gives relatively high confidence
030258,000013:                                                                                                  ##              that the reconstruction is correct.
030259,000014:                                                                                                  ## Reference:   pp. 703-705
030260,000015:                                                                                                  ## Assembler:   yaYUL
030261,000016:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
030262,000017:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
030263,000018:                                                                                                  ## Mod history: 2019-08-21 MAS  Created from Luminary 173.
030264,000019: 

Page 703

030266,000021:                                                                                                  #  1) PROGRAM NAME - TARGET DELTA V PROGRAM (P76).
030267,000022:                                                                                                  #  2) FUNCTIONAL DESCRIPTION - UPON ENTRY BY ASTRONAUT ACTION, P76 FLASHES DSKY REQUESTS TO THE ASTRONAUT
030268,000023:                                                                                                  #           TO PROVIDE VIA DSKY (1) THE DELTA V TO BE APPLIED TO THE OTHER VEHICLE STATE VECTOR AND (2) THE
030269,000024:                                                                                                  #           TIME (TIG) AT WHICH THE OTHER VEHICLE VELOCITY WAS CHANGED BY  EXECUTION OF A THRUSTING MANEUVER. THE
030270,000025:                                                                                                  #           OTHER VEHICLE STATE VECTOR IS INTEGRATED TO TIG AND UPDATED BY THE ADDITION OF DELTA V (DELTA V HAVING
030271,000026:                                                                                                  #           BEEN TRANSFORMED FROM LV TO REF COSYS).  USING INTEGRVS, THE   PROGRAM THEN INTEGRATES THE OTHER
030272,000027:                                                                                                  #  VEHICLE STATE VECTOR TO THE STATE VECTOR OF THIS VEHICLE, THUS INSURING THAT THE W-MATRIX AND BOTH VEHICLE
030273,000028:                                                                                                  #  STATES CORRESPOND TO THE SAME TIME.
030274,000029:                                                                                                  #  3) ERASABLE INITIALIZATION REQUIRED - NONE.
030275,000030:                                                                                                  #  4) CALLING SEQUENCES AND EXIT MODES - CALLED BY ASTRONAUT REQUEST THRU DSKY V 37 E 76 E.
030276,000031:                                                                                                  #           EXITS BY TCF ENDOFJOB.
030277,000032:                                                                                                  #  5) OUTPUT - OTHER VEHICLE STATE VECTOR INTEGRATED TO TIG AND INCREMENTED BY DELTA V IN REF COSYS.
030278,000033:                                                                                                  #           THE PUSHLIST CONTAINS THE MATRIX BY WHICH THE INPUT DELTA V MUST BE POST-MULTIPLIED TO CONVERT FROM LV
030279,000034:                                                                                                  #           TO REF COSYS.
030280,000035:                                                                                                  #  6) DEBRIS - OTHER VEHICLE STATE VECTOR.
030281,000036:                                                                                                  #  7) SUBROUTINES CALLED - BANKCALL,GOXDSPF,CSMPREC (OR LEMPREC),ATOPCSM (OR ATOPLEM),INTSTALL,INTWAKE, PHASCHNG
030282,000037:                                                                                                  #           INTPRET, INTEGRVS, AND MINIRECT.
030283,000038: 
030284,000039:                                                                                                  #  8) FLAG USE - MOONFLAG,CMOONFLAG,INTYPFLG,RASFLAG, AND MARKCTR.
030285,000040: 
030286,000041: 30,2061                                           BANK     30                                    
030287,000042: 13,2000                                           SETLOC   P76LOC                                
030288,000043: 13,2000                                           BANK                                           
030289,000044: 
030290,000045: 13,2207                                           COUNT*   $$/P76                                
030291,000046: 
030292,000047: 13,2207  E7,1441                                  EBANK=   TIG                                   
030293,000048: 
030294,000049: 13,2207           05515        P76                TC       UPFLAG                                
030295,000050: 13,2210           00031                           ADRES    TRACKFLG                              
030296,000051: 
030297,000052: 13,2211           06042                           TC       INTPRET                               
030298,000053: 13,2212           77775                           VLOAD                                          
030299,000054: 13,2213           03434                                    DELVLVC                               
030300,000055: 13,2214           02223                           STORE    DELVOV                                
030301,000056: 13,2215           77776                           EXIT                                           
030302,000057: 
030303,000058: 13,2216           32335                           CAF      V06N84     +1                         #  FLASH VERB 06 NOUN 33, DISPLAY LAST TIG,
030304,000059: 13,2217           04616                           TC       BANKCALL                              #  AND WAIT FOR KEYBOARD ACTION.
030305,000060: 13,2220           20477                           CADR     GOFLASH                               
030306,000061: 13,2221           12331                           TCF      ENDP76                                
030307,000062: 13,2222           02224                           TC       +2                                    #  PROCEED
030308,000063: 13,2223           02216                           TC       -5                                    #  STORE DATA AND REPEAT FLASHING
030309,000064: 13,2224           32334                           CAF      V06N84                                #  FLASH LAST DELTA V,
030310,000065: 13,2225           04616                           TC       BANKCALL                              #  AND WAIT FOR KEYBOARD ACTION.
030311,000066: 13,2226           20477                           CADR     GOFLASH                               
030312,000067: 13,2227           12331                           TCF      ENDP76                                
030313,000068: 13,2230           02232                           TC       +2                                    
030314,000069: 13,2231           02224                           TC       -5                                    
030315,000070: 13,2232           06042                           TC       INTPRET                               #  RETURN TO INTERPRETIVE CODE

Page 704

030317,000072: 13,2233           43145                           DLOAD    SET                                   
030318,000073: 13,2234           03442                                    TIG                                   
030319,000074: 13,2235           01076                                    NODOFLAG                              
030320,000075: 13,2236           34041                           STCALL   TDEC1                                 #  SET TDEC1=TIG FOR ORBITAL INTEGRATION
030321,000076: 13,2237           27042                                    OTHPREC                               
030322,000077: 13,2240           53575        COMPMAT            VLOAD    UNIT                                  
030323,000078: 13,2241           00001                                    RATT                                  
030324,000079: 13,2242           77676                           VCOMP                                          #  U(-R)
030325,000080: 13,2243           00031                           STORE    24D                                   #  U(-R) TO 24D
030326,000081: 13,2244           53435                           VXV      UNIT                                  #  U(-R)XV = U(VXR)
030327,000082: 13,2245           00007                                    VATT                                  
030328,000083: 13,2246           00023                           STORE    18D                                   
030329,000084: 13,2247           53435                           VXV      UNIT                                  #  U(VXR)XU(-R) = U((RXV)XR)
030330,000085: 13,2250           00031                                    24D                                   
030331,000086: 13,2251           24015                           STOVL    12D                                   
030332,000087: 13,2252           02223                                    DELVOV                                
030333,000088: 13,2253           76505                           VXM      VSL1                                  #  V(MPAC)=DELTA V IN REFCOSYS
030334,000089: 13,2254           00015                                    12D                                   
030335,000090: 13,2255           77655                           VAD                                            
030336,000091: 13,2256           00007                                    VATT                                  
030337,000092: 13,2257           00007                           STORE    6                                     #  V(PD6)=VATT + DELTA V
030338,000093: 13,2260           77624                           CALL                                           #  PREVENT WOULD-BE USER OF ORBITAL
030339,000094: 13,2261           27410                                    INTSTALL                              #  INTEG FROM INTERFERING WITH UPDATING
030340,000095: 13,2262           77624                           CALL                                           
030341,000096: 13,2263           26336                                    P76SUB1                               
030342,000097: 13,2264           53775                           VLOAD    VSR*                                  
030343,000098: 13,2265           00007                                    6                                     
030344,000099: 13,2266           57176                                    0,2                                   
030345,000100: 13,2267           25543                           STOVL    VCV                                   
030346,000101: 13,2270           00001                                    RATT                                  
030347,000102: 13,2271           77657                           VSR*                                           
030348,000103: 13,2272           57176                                    0,2                                   
030349,000104: 13,2273           15535                           STODL    RCV                                   
030350,000105: 13,2274           03442                                    TIG                                   
030351,000106: 13,2275           01517                           STORE    TET                                   
030352,000107: 13,2276           71214                           CLEAR    DLOAD                                 
030353,000108: 13,2277           01673                                    INTYPFLG                              
030354,000109: 13,2300           01643                                    TETTHIS                               
030355,000110: 13,2301           34041        INTOTHIS           STCALL   TDEC1                                 
030356,000111: 13,2302           27106                                    INTEGRVS                              
030357,000112: 13,2303           77624                           CALL                                           
030358,000113: 13,2304           27410                                    INTSTALL                              
030359,000114: 13,2305           77775                           VLOAD                                          
030360,000115: 13,2306           00017                                    RATT1                                 
030361,000116: 13,2307           01503                           STORE    RRECT                                 
030362,000117: 13,2310           15535                           STODL    RCV                                   
030363,000118: 13,2311           00015                                    TAT                                   
030364,000119: 13,2312           25517                           STOVL    TET                                   
030365,000120: 13,2313           00025                                    VATT1                                 
030366,000121: 13,2314           77624                           CALL                                           

Page 705

030368,000123: 13,2315           27705                                    MINIRECT                              
030369,000124: 13,2316           77776                           EXIT                                           
030370,000125: 13,2317           05364                           TC       PHASCHNG                              
030371,000126: 13,2320           04024                           OCT      04024                                 
030372,000127: 
030373,000128: 13,2321           06042                           TC       INTPRET                               
030374,000129: 13,2322           45014                           SET      CALL                                  
030375,000130: 13,2323           05070                                    REINTFLG                              
030376,000131: 13,2324           26660                                    ATOPOTH                               
030377,000132: 13,2325           77624                           CALL                                           
030378,000133: 13,2326           27417                                    INTWAKE0                              
030379,000134: 13,2327           77414        OUT                CLEAR    EXIT                                  #  ALLOW V37.  NO NEED TO CLEAR NODOFLAG AT
030380,000135: 13,2330           01276                                    NODOFLAG                              #   ENDP76 SINCE FLAG NOT SET WHEN DISPLAY
030381,000136:                                                                                                  #   RESPONSES TRANSFER THERE FROM P76+.
030382,000137: 13,2331           34755        ENDP76             CAF      ZERO                                  
030383,000138: 13,2332           55462                           TS       MARKCTR                               #  CLEAR RR TRACKING MARK COUNTER
030384,000139: 13,2333           16001                           TCF      GOTOPOOH                              
030385,000140: 
030386,000141: 13,2334           01524        V06N84             NV       0684                                  
030387,000142: 13,2335           01441                           NV       0633                                  
030388,000143: 13,2336           43174        P76SUB1            AXT,2    SET                                   
030389,000144: 13,2337           00002                                    2                                     
030390,000145: 13,2340           00063                                    MOONFLAG                              #  SET MEANS MOON IS SPHERE OF INFLUENCE.
030391,000146: 13,2341           77014                           BON      AXT,2                                 
030392,000147: 13,2342           04303                                    CMOONFLG                              #  SET MEANS PERM CM STATE IN LUNAR SPHERE.
030393,000148: 13,2343           00052                                    QPRET                                 
030394,000149: 13,2344           00000                                    0                                     
030395,000150: 13,2345           43414                           CLEAR    RVQ                                   
030396,000151: 13,2346           00263                                    MOONFLAG                              

End of include-file P76.agc.  Parent file is MAIN.agc