Source Code

These source-code files are part of a reconstructed copy of Luminary 178, the final release of the Apollo 14 Lunar Module (LM) Apollo Guidance Computer (AGC) software.

The reconstruction began with source code of Zerlina 56, Luminary 210, and Luminary 131, previously transcribed from digitized copies of those programs. The code was created by combining the three, using Zerlina 56 as a base, since it was based off of Luminary 183. The differences between the three were carefully merged using the Luminary memos as a guide, with all changes made after Luminary 178 being backed out. 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 178 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.

030318,000002:                                                                                                  ## Copyright:   Public domain.
030319,000003:                                                                                                  ## Filename:    P76.agc
030320,000004:                                                                                                  ## Purpose:     A section of Luminary revision 178.
030321,000005:                                                                                                  ##              It is part of the reconstructed source code for the final
030322,000006:                                                                                                  ##              release of the flight software for the Lunar Module's
030323,000007:                                                                                                  ##              (LM) Apollo Guidance Computer (AGC) for Apollo 14. The
030324,000008:                                                                                                  ##              code has been recreated from copies of Zerlina 56, Luminary
030325,000009:                                                                                                  ##              210, and Luminary 131, as well as many Luminary memos.
030326,000010:                                                                                                  ##              It has been adapted such that the resulting bugger words
030327,000011:                                                                                                  ##              exactly match those specified for Luminary 178 in NASA
030328,000012:                                                                                                  ##              drawing 2021152N, which gives relatively high confidence
030329,000013:                                                                                                  ##              that the reconstruction is correct.
030330,000014:                                                                                                  ## Reference:   pp. 703-705
030331,000015:                                                                                                  ## Assembler:   yaYUL
030332,000016:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
030333,000017:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
030334,000018:                                                                                                  ## Mod history: 2019-08-14 MAS  Created from Zerlina 56.
030335,000019: 

Page 703

030337,000021:                                                                                                  #  1) PROGRAM NAME - TARGET DELTA V PROGRAM (P76).
030338,000022:                                                                                                  #  2) FUNCTIONAL DESCRIPTION - UPON ENTRY BY ASTRONAUT ACTION, P76 FLASHES DSKY REQUESTS TO THE ASTRONAUT
030339,000023:                                                                                                  #           TO PROVIDE VIA DSKY (1) THE DELTA V TO BE APPLIED TO THE OTHER VEHICLE STATE VECTOR AND (2) THE
030340,000024:                                                                                                  #           TIME (TIG) AT WHICH THE OTHER VEHICLE VELOCITY WAS CHANGED BY  EXECUTION OF A THRUSTING MANEUVER. THE
030341,000025:                                                                                                  #           OTHER VEHICLE STATE VECTOR IS INTEGRATED TO TIG AND UPDATED BY THE ADDITION OF DELTA V (DELTA V HAVING
030342,000026:                                                                                                  #           BEEN TRANSFORMED FROM LV TO REF COSYS).  USING INTEGRVS, THE   PROGRAM THEN INTEGRATES THE OTHER
030343,000027:                                                                                                  #  VEHICLE STATE VECTOR TO THE STATE VECTOR OF THIS VEHICLE, THUS INSURING THAT THE W-MATRIX AND BOTH VEHICLE
030344,000028:                                                                                                  #  STATES CORRESPOND TO THE SAME TIME.
030345,000029:                                                                                                  #  3) ERASABLE INITIALIZATION REQUIRED - NONE.
030346,000030:                                                                                                  #  4) CALLING SEQUENCES AND EXIT MODES - CALLED BY ASTRONAUT REQUEST THRU DSKY V 37 E 76 E.
030347,000031:                                                                                                  #           EXITS BY TCF ENDOFJOB.
030348,000032:                                                                                                  #  5) OUTPUT - OTHER VEHICLE STATE VECTOR INTEGRATED TO TIG AND INCREMENTED BY DELTA V IN REF COSYS.
030349,000033:                                                                                                  #           THE PUSHLIST CONTAINS THE MATRIX BY WHICH THE INPUT DELTA V MUST BE POST-MULTIPLIED TO CONVERT FROM LV
030350,000034:                                                                                                  #           TO REF COSYS.
030351,000035:                                                                                                  #  6) DEBRIS - OTHER VEHICLE STATE VECTOR.
030352,000036:                                                                                                  #  7) SUBROUTINES CALLED - BANKCALL,GOXDSPF,CSMPREC (OR LEMPREC),ATOPCSM (OR ATOPLEM),INTSTALL,INTWAKE, PHASCHNG
030353,000037:                                                                                                  #           INTPRET, INTEGRVS, AND MINIRECT.
030354,000038: 
030355,000039:                                                                                                  #  8) FLAG USE - MOONFLAG,CMOONFLAG,INTYPFLG,RASFLAG, AND MARKCTR.
030356,000040: 
030357,000041: 30,2061                                           BANK     30                                    
030358,000042: 13,2000                                           SETLOC   P76LOC                                
030359,000043: 13,2000                                           BANK                                           
030360,000044: 
030361,000045: 13,2207                                           COUNT*   $$/P76                                
030362,000046: 
030363,000047: 13,2207  E7,1441                                  EBANK=   TIG                                   
030364,000048: 
030365,000049: 13,2207           05515        P76                TC       UPFLAG                                
030366,000050: 13,2210           00031                           ADRES    TRACKFLG                              
030367,000051: 
030368,000052: 13,2211           06042                           TC       INTPRET                               
030369,000053: 13,2212           77775                           VLOAD                                          
030370,000054: 13,2213           03434                                    DELVLVC                               
030371,000055: 13,2214           02223                           STORE    DELVOV                                
030372,000056: 13,2215           77776                           EXIT                                           
030373,000057: 
030374,000058: 13,2216           32335                           CAF      V06N84     +1                         #  FLASH VERB 06 NOUN 33, DISPLAY LAST TIG,
030375,000059: 13,2217           04616                           TC       BANKCALL                              #  AND WAIT FOR KEYBOARD ACTION.
030376,000060: 13,2220           20477                           CADR     GOFLASH                               
030377,000061: 13,2221           12331                           TCF      ENDP76                                
030378,000062: 13,2222           02224                           TC       +2                                    #  PROCEED
030379,000063: 13,2223           02216                           TC       -5                                    #  STORE DATA AND REPEAT FLASHING
030380,000064: 13,2224           32334                           CAF      V06N84                                #  FLASH LAST DELTA V,
030381,000065: 13,2225           04616                           TC       BANKCALL                              #  AND WAIT FOR KEYBOARD ACTION.
030382,000066: 13,2226           20477                           CADR     GOFLASH                               
030383,000067: 13,2227           12331                           TCF      ENDP76                                
030384,000068: 13,2230           02232                           TC       +2                                    
030385,000069: 13,2231           02224                           TC       -5                                    
030386,000070: 13,2232           06042                           TC       INTPRET                               #  RETURN TO INTERPRETIVE CODE

Page 704

030388,000072: 13,2233           43145                           DLOAD    SET                                   
030389,000073: 13,2234           03442                                    TIG                                   
030390,000074: 13,2235           01076                                    NODOFLAG                              
030391,000075: 13,2236           34041                           STCALL   TDEC1                                 #  SET TDEC1=TIG FOR ORBITAL INTEGRATION
030392,000076: 13,2237           27042                                    OTHPREC                               
030393,000077: 13,2240           53575        COMPMAT            VLOAD    UNIT                                  
030394,000078: 13,2241           00001                                    RATT                                  
030395,000079: 13,2242           77676                           VCOMP                                          #  U(-R)
030396,000080: 13,2243           00031                           STORE    24D                                   #  U(-R) TO 24D
030397,000081: 13,2244           53435                           VXV      UNIT                                  #  U(-R)XV = U(VXR)
030398,000082: 13,2245           00007                                    VATT                                  
030399,000083: 13,2246           00023                           STORE    18D                                   
030400,000084: 13,2247           53435                           VXV      UNIT                                  #  U(VXR)XU(-R) = U((RXV)XR)
030401,000085: 13,2250           00031                                    24D                                   
030402,000086: 13,2251           24015                           STOVL    12D                                   
030403,000087: 13,2252           02223                                    DELVOV                                
030404,000088: 13,2253           76505                           VXM      VSL1                                  #  V(MPAC)=DELTA V IN REFCOSYS
030405,000089: 13,2254           00015                                    12D                                   
030406,000090: 13,2255           77655                           VAD                                            
030407,000091: 13,2256           00007                                    VATT                                  
030408,000092: 13,2257           00007                           STORE    6                                     #  V(PD6)=VATT + DELTA V
030409,000093: 13,2260           77624                           CALL                                           #  PREVENT WOULD-BE USER OF ORBITAL
030410,000094: 13,2261           27410                                    INTSTALL                              #  INTEG FROM INTERFERING WITH UPDATING
030411,000095: 13,2262           77624                           CALL                                           
030412,000096: 13,2263           26336                                    P76SUB1                               
030413,000097: 13,2264           53775                           VLOAD    VSR*                                  
030414,000098: 13,2265           00007                                    6                                     
030415,000099: 13,2266           57176                                    0,2                                   
030416,000100: 13,2267           25543                           STOVL    VCV                                   
030417,000101: 13,2270           00001                                    RATT                                  
030418,000102: 13,2271           77657                           VSR*                                           
030419,000103: 13,2272           57176                                    0,2                                   
030420,000104: 13,2273           15535                           STODL    RCV                                   
030421,000105: 13,2274           03442                                    TIG                                   
030422,000106: 13,2275           01517                           STORE    TET                                   
030423,000107: 13,2276           71214                           CLEAR    DLOAD                                 
030424,000108: 13,2277           01673                                    INTYPFLG                              
030425,000109: 13,2300           01643                                    TETTHIS                               
030426,000110: 13,2301           34041        INTOTHIS           STCALL   TDEC1                                 
030427,000111: 13,2302           27106                                    INTEGRVS                              
030428,000112: 13,2303           77624                           CALL                                           
030429,000113: 13,2304           27410                                    INTSTALL                              
030430,000114: 13,2305           77775                           VLOAD                                          
030431,000115: 13,2306           00017                                    RATT1                                 
030432,000116: 13,2307           01503                           STORE    RRECT                                 
030433,000117: 13,2310           15535                           STODL    RCV                                   
030434,000118: 13,2311           00015                                    TAT                                   
030435,000119: 13,2312           25517                           STOVL    TET                                   
030436,000120: 13,2313           00025                                    VATT1                                 
030437,000121: 13,2314           77624                           CALL                                           

Page 705

030439,000123: 13,2315           27705                                    MINIRECT                              
030440,000124: 13,2316           77776                           EXIT                                           
030441,000125: 13,2317           05364                           TC       PHASCHNG                              
030442,000126: 13,2320           04024                           OCT      04024                                 
030443,000127: 
030444,000128: 13,2321           06042                           TC       INTPRET                               
030445,000129: 13,2322           45014                           SET      CALL                                  
030446,000130: 13,2323           05070                                    REINTFLG                              
030447,000131: 13,2324           26660                                    ATOPOTH                               
030448,000132: 13,2325           77624                           CALL                                           
030449,000133: 13,2326           27417                                    INTWAKE0                              
030450,000134: 13,2327           77414        OUT                CLEAR    EXIT                                  #  ALLOW V37.  NO NEED TO CLEAR NODOFLAG AT
030451,000135: 13,2330           01276                                    NODOFLAG                              #   ENDP76 SINCE FLAG NOT SET WHEN DISPLAY
030452,000136:                                                                                                  #   RESPONSES TRANSFER THERE FROM P76+.
030453,000137: 13,2331           34755        ENDP76             CAF      ZERO                                  
030454,000138: 13,2332           55462                           TS       MARKCTR                               #  CLEAR RR TRACKING MARK COUNTER
030455,000139: 13,2333           16001                           TCF      GOTOPOOH                              
030456,000140: 
030457,000141: 13,2334           01524        V06N84             NV       0684                                  
030458,000142: 13,2335           01441                           NV       0633                                  
030459,000143: 13,2336           43174        P76SUB1            AXT,2    SET                                   
030460,000144: 13,2337           00002                                    2                                     
030461,000145: 13,2340           00063                                    MOONFLAG                              #  SET MEANS MOON IS SPHERE OF INFLUENCE.
030462,000146: 13,2341           77014                           BON      AXT,2                                 
030463,000147: 13,2342           04303                                    CMOONFLG                              #  SET MEANS PERM CM STATE IN LUNAR SPHERE.
030464,000148: 13,2343           00052                                    QPRET                                 
030465,000149: 13,2344           00000                                    0                                     
030466,000150: 13,2345           43414                           CLEAR    RVQ                                   
030467,000151: 13,2346           00263                                    MOONFLAG                              

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