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
	20'35 OCT. 28,1968
Note that the date is the date of the printout, not the date of the program revision.

020898,000002:                                                                                                  ## Copyright:   Public domain.
020899,000003:                                                                                                  ## Filename:    S-BAND_ANTENNA_FOR_LM.agc
020900,000004:                                                                                                  ## Purpose:     Part of the source code for Luminary 1A build 099.
020901,000005:                                                                                                  ##              It is part of the source code for the Lunar Module's (LM)
020902,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), for Apollo 11.
020903,000007:                                                                                                  ## Assembler:   yaYUL
020904,000008:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
020905,000009:                                                                                                  ## Website:     www.ibiblio.org/apollo.
020906,000010:                                                                                                  ## Pages:       486-489
020907,000011:                                                                                                  ## Mod history: 2009-05-17 RSB  Adapted from the corresponding 
020908,000012:                                                                                                  ##                              Luminary131 file, using page 
020909,000013:                                                                                                  ##                              images from Luminary 1A.
020910,000014:                                                                                                  ##              2009-06-07 RSB  Corrected a misprint.
020911,000015:                                                                                                  ##              2016-12-14 RSB  Proofed text comments with octopus/ProoferComments
020912,000016:                                                                                                  ##                              and corrected the errors found.
020913,000017:                                                                                                  ##
020914,000018:                                                                                                  ## This source code has been transcribed or otherwise adapted from
020915,000019:                                                                                                  ## digitized images of a hardcopy from the MIT Museum.  The digitization
020916,000020:                                                                                                  ## was performed by Paul Fjeld, and arranged for by Deborah Douglas of
020917,000021:                                                                                                  ## the Museum.  Many thanks to both.  The images (with suitable reduction
020918,000022:                                                                                                  ## in storage size and consequent reduction in image quality as well) are
020919,000023:                                                                                                  ## available online at www.ibiblio.org/apollo.  If for some reason you
020920,000024:                                                                                                  ## find that the images are illegible, contact me at info@sandroid.org
020921,000025:                                                                                                  ## about getting access to the (much) higher-quality images which Paul
020922,000026:                                                                                                  ## actually created.
020923,000027:                                                                                                  ##
020924,000028:                                                                                                  ## Notations on the hardcopy document read, in part:
020925,000029:                                                                                                  ##
020926,000030:                                                                                                  ##      Assemble revision 001 of AGC program LMY99 by NASA 2021112-61
020927,000031:                                                                                                  ##      16:27 JULY 14, 1969 
020928,000032: 

Page 486

020930,000034:                                                                                                  #  SUBROUTINE NAME: R05 - S-BAND ANTENNA FOR LM
020931,000035: 
020932,000036:                                                                                                  #  MOD0 BY T. JAMES
020933,000037:                                                                                                  #  MOD1 BY P. SHAKIR
020934,000038: 
020935,000039:                                                                                                  #  FUNCTIONAL DESCRIPTION
020936,000040: 
020937,000041:                                                                                                  #  THE S-BAND ANTENNA ROUTINE, R05, COMPUTES AND DISPLAYS THE PITCH AND
020938,000042:                                                                                                  #  YAW ANTENNA GIMBAL ANGLES REQUIRED TO POINT THE LM STEERABLE ANTENNA
020939,000043:                                                                                                  #  TOWARD THE CENTER OF THE EARTH.  THIS ROUTINE IS SELECTED BY THE ASTRO-
020940,000044:                                                                                                  #  NAUT VIA DSKY ENTRY DURING COASTING FLIGHT OR WHEN THE LM IS ON THE MOON
020941,000045:                                                                                                  #  SURFACE.  THE EARTH OR MOON REFERENCE COORDINATE SYSTEM IS USED DEPENDING
020942,000046:                                                                                                  #  ON WHETHER THE LM IS ABOUT TO ENTER OR HAS ALREADY ENTERED THE MOON
020943,000047:                                                                                                  #  SPHERE OF INFLUENCE, RESPECTIVELY
020944,000048: 
020945,000049:                                                                                                  #  TO CALL SUBROUTINE, ASTRONAUT KEYS IN V 64 E
020946,000050: 
020947,000051:                                                                                                  #  SUBROUTINES CALLED -
020948,000052:                                                                                                  #        R02BOTH
020949,000053:                                                                                                  #        INTPRET
020950,000054:                                                                                                  #        LOADTIME
020951,000055:                                                                                                  #        LEMCONIC
020952,000056:                                                                                                  #        LUNPOS
020953,000057:                                                                                                  #        CDUTRIG
020954,000058:                                                                                                  #        *SMNB*
020955,000059:                                                                                                  #        BANKCALL
020956,000060:                                                                                                  #        B5OFF
020957,000061:                                                                                                  #        ENDOFJOB
020958,000062:                                                                                                  #        BLANKET
020959,000063: 
020960,000064:                                                                                                  #  RETURNS WITH
020961,000065:                                                                                                  #        PITCH ANGLE IN PITCHANG         REV. B0
020962,000066:                                                                                                  #        YAW ANGLE IN YAWANG             REV. B0
020963,000067: 
020964,000068:                                                                                                  #  ERASABLES USED
020965,000069:                                                                                                  #        PITCHANG
020966,000070:                                                                                                  #        YAWANG
020967,000071:                                                                                                  #        RLM
020968,000072:                                                                                                  #        VAC AREA
020969,000073: 
020970,000074: 41,3731                                           BANK     41                                    
020971,000075: 42,2000                                           SETLOC   SBAND                                 
020972,000076: 42,2000                                           BANK                                           
020973,000077: 
020974,000078: 42,3606  E7,1471                                  EBANK=   WHOCARES                              
020975,000079: 42,3606                                           COUNT*   $$/R05                                
020976,000080: 42,3606           04616        SBANDANT           TC       BANKCALL                              

Page 487

020978,000082: 42,3607           11254                           CADR     R02BOTH                               #  CHECK IF IMU IS ON AND ALIGNED
020979,000083: 42,3610           06037                           TC       INTPRET                               
020980,000084: 42,3611           47001                           SETPD    RTB                                   
020981,000085: 42,3612           00001                                    0D                                    
020982,000086: 42,3613           21573                                    LOADTIME                              #  PICK UP CURRENT TIME
020983,000087: 42,3614           34041                           STCALL   TDEC1                                 #  ADVANCE INTEGRATION TO TIME IN TDEC1
020984,000088: 42,3615           27100                                    LEMCONIC                              #  USING CONIC INTEGRATION
020985,000089: 42,3616           46135                           SLOAD    BHIZ                                  
020986,000090: 42,3617           00050                                    X2                                    #  X2 =0 EARTH SPHERE, X2 =2 MOON SPHERE
020987,000091: 42,3620           65636                                    CONV4                                 
020988,000092: 42,3621           77775                           VLOAD                                          
020989,000093: 42,3622           00001                                    RATT                                  
020990,000094: 42,3623           16205                           STODL    RLM                                   
020991,000095: 42,3624           00015                                    TAT                                   
020992,000096: 42,3625           77624        CONV3              CALL                                           
020993,000097: 42,3626           33664                                    LUNPOS                                #  UNIT POSITION VECTOR FROM EARTH TO MOON
020994,000098: 42,3627           74375                           VLOAD    VXSC                                  
020995,000099: 42,3630           02723                                    VMOON                                 
020996,000100: 42,3631           24001                                    REMDIST                               #  MEAN DISTANCE FROM EARTH TO MOON
020997,000101: 42,3632           53372                           VSL1     VAD                                   
020998,000102: 42,3633           02205                                    RLM                                   
020999,000103: 42,3634           77650                           GOTO                                           
021000,000104: 42,3635           65640                                    CONV5                                 
021001,000105: 42,3636           77775        CONV4              VLOAD                                          
021002,000106: 42,3637           00001                                    RATT                                  #  UE = -UNIT(RATT)              EARTH SPHERE
021003,000107: 42,3640           53401        CONV5              SETPD    UNIT                                  #  UE = -UNIT((REM)(UEM) + RL)   MOON SPHERE
021004,000108: 42,3641           00001                                    0D                                    #  SET PL POINTER TO 0
021005,000109: 42,3642           45076                           VCOMP    CALL                                  
021006,000110: 42,3643           47537                                    CDUTRIG                               #  COMPUTE SINES AND COSINES OF CDU ANGLES
021007,000111: 42,3644           76521                           MXV      VSL1                                  #  TRANSFORM REF. COORDINATE SYSTEM TO
021008,000112: 42,3645           01734                                    REFSMMAT                              #  STABLE MEMBER B-1 X B-1 X B+1 = B-1
021009,000113: 42,3646           71206                           PUSH     DLOAD                                 #  8D
021010,000114: 42,3647           06522                                    HI6ZEROS                              
021011,000115: 42,3650           02201                           STORE    PITCHANG                              
021012,000116: 42,3651           26203                           STOVL    YAWANG                                #  ZERO OUT ANGLES
021013,000117: 42,3652           77624                           CALL                                           
021014,000118: 42,3653           47671                                    *SMNB*                                
021015,000119: 42,3654           16205                           STODL    RLM                                   #  PRE-MULTIPLY RLM BY (NBSA) MATRIX(B0)
021016,000120: 42,3655           02207                                    RLM        +2                         
021017,000121: 42,3656           45206                           PUSH     DSU                                   
021018,000122: 42,3657           02205                                    RLM                                   
021019,000123: 42,3660           77605                           DMP                                            
021020,000124: 42,3661           25771                                    1OVSQRT2                              
021021,000125: 42,3662           16207                           STODL    RLM        +2                         
021022,000126: 42,3663           41215                           DAD      DMP                                   
021023,000127: 42,3664           02205                                    RLM                                   
021024,000128: 42,3665           25771                                    1OVSQRT2                              
021025,000129: 42,3666           26205                           STOVL    RLM                                   #  R B-1
021026,000130: 42,3667           02205                                    RLM                                   
021027,000131: 42,3670           63256                           UNIT     PDVL                                  

Page 488

021029,000133: 42,3671           02205                                    RLM                                   
021030,000134: 42,3672           72431                           VPROJ    VSL2                                  #  PROJECTION OF R ONTO LM XZ PLANE
021031,000135: 42,3673           06516                                    HIUNITY                               
021032,000136: 42,3674           40045                           BVSU     BOV                                   #  CLEAR OVERFLOW INDICATOR IF ON
021033,000137: 42,3675           02205                                    RLM                                   
021034,000138: 42,3676           65677                                    COVCNV                                
021035,000139: 42,3677           40056        COVCNV             UNIT     BOV                                   #  EXIT ON OVERFLOW
021036,000140: 42,3700           65745                                    SBANDEX                               
021037,000141: 42,3701           47206                           PUSH     VXV                                   #  URP VECTOR B-1
021038,000142: 42,3702           06514                                    HIUNITZ                               
021039,000143: 42,3703           57572                           VSL1     VCOMP                                 #  UZ X URP = -(URP X UZ)
021040,000144: 42,3704           02205                           STORE    RLM                                   #  X VEC B-1
021041,000145: 42,3705           63241                           DOT      PDVL                                  #  SGN(X.UY) UNSCALED
021042,000146: 42,3706           06516                                    HIUNITY                               
021043,000147: 42,3707           02205                                    RLM                                   
021044,000148: 42,3710           75246                           ABVAL    SIGN                                  
021045,000149: 42,3711           77736                           ASIN                                           #  ASIN((SGN(X.UY))ABV(X))       REV B0
021046,000150: 42,3712           26201                           STOVL    PITCHANG                              
021047,000151: 42,3713           00007                                    URP                                   
021048,000152: 42,3714           51041                           DOT      BPL                                   
021049,000153: 42,3715           06514                                    HIUNITZ                               
021050,000154: 42,3716           65723                                    NOADJUST                              #  YES, -90 TO +90
021051,000155: 42,3717           45345                           DLOAD    DSU                                   
021052,000156: 42,3720           06520                                    HIDPHALF                              
021053,000157: 42,3721           02201                                    PITCHANG                              
021054,000158: 42,3722           02201                           STORE    PITCHANG                              
021055,000159: 42,3723           47375        NOADJUST           VLOAD    VXV                                   
021056,000160: 42,3724           00001                                    UR                                    #  Z = (UR X URP)
021057,000161: 42,3725           00007                                    URP                                   
021058,000162: 42,3726           77772                           VSL1                                           
021059,000163: 42,3727           16205                           STODL    RLM                                   #  Z VEC B-1
021060,000164: 42,3730           02201                                    PITCHANG                              
021061,000165: 42,3731           74356                           SIN      VXSC                                  
021062,000166: 42,3732           06514                                    HIUNITZ                               
021063,000167: 42,3733           71525                           PDDL     COS                                   
021064,000168: 42,3734           02201                                    PITCHANG                              
021065,000169: 42,3735           52361                           VXSC     VSU                                   
021066,000170: 42,3736           06520                                    HIUNITX                               #  (UX COS ALPHA) - (UZ SIN ALPHA)
021067,000171: 42,3737           63241                           DOT      PDVL                                  #  YAW.Z
021068,000172: 42,3740           02205                                    RLM                                   
021069,000173: 42,3741           02205                                    RLM                                   
021070,000174: 42,3742           75246                           ABVAL    SIGN                                  
021071,000175: 42,3743           77736                           ASIN                                           
021072,000176: 42,3744           02203                           STORE    YAWANG                                
021073,000177: 42,3745           77776        SBANDEX            EXIT                                           
021074,000178: 42,3746           31044                           CA       EXTVBACT                              
021075,000179: 42,3747           74747                           MASK     BIT5                                  #  IS BIT5 STILL ON
021076,000180: 42,3750           00006                           EXTEND                                         
021077,000181: 42,3751           15472                           BZF      ENDEXT                                #  NO
021078,000182: 42,3752           35017                           CAF      PRIO5                                 

Page 489

021080,000184: 42,3753           05146                           TC       PRIOCHNG                              
021081,000185: 42,3754           33767                           CAF      V06N51                                #  DISPLAY ANGLES
021082,000186: 42,3755           04616                           TC       BANKCALL                              
021083,000187: 42,3756           20353                           CADR     GOMARKFR                              
021084,000188: 42,3757           05563                           TC       B5OFF                                 #  TERMINATE
021085,000189: 42,3760           05563                           TC       B5OFF                                 #  PROCEED
021086,000190: 42,3761           05155                           TC       ENDOFJOB                              #  RECYCLE
021087,000191: 42,3762           34751                           CAF      BIT3                                  #  IMMEDIATE RETURN
021088,000192: 42,3763           05464                           TC       BLANKET                               #  BLANK R3
021089,000193: 42,3764           34740                           CAF      PRIO4                                 
021090,000194: 42,3765           05146                           TC       PRIOCHNG                              
021091,000195: 42,3766           03610                           TC       SBANDANT   +2                         #  YES, CONTINUE DISPLAYING ANGLES
021092,000196: 42,3767           01463        V06N51             VN       0651                                  
021093,000197: 42,3770           26501 07463  1OVSQRT2           2DEC     .7071067815                            #  1/SQRT(2)
021094,000198: 
021095,000199: 42,3772                        UR                 EQUALS   0D                                    
021096,000200: 42,3772                        URP                EQUALS   6D                                    
021097,000201: 42,3772  30,2000                                  SBANK=   LOWSUPER                              
021098,000202: 

End of include-file S-BAND_ANTENNA_FOR_LM.agc.  Parent file is MAIN.agc