Source Code
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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.
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028045,000002: ## Copyright: Public domain.
028046,000003: ## Filename: GROUND_TRACKING_DETERMINATION_PROGRAM_-_P21.agc
028047,000004: ## Purpose: A section of Luminary revision 163.
028048,000005: ## It is part of the reconstructed source code for the first
028049,000006: ## (unflown) release of the flight software for the Lunar
028050,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
028051,000008: ## The code has been recreated from a reconstructed copy of
028052,000009: ## Luminary 173, as well as Luminary memos 157 amd 158.
028053,000010: ## It has been adapted such that the resulting bugger words
028054,000011: ## exactly match those specified for Luminary 163 in NASA
028055,000012: ## drawing 2021152N, which gives relatively high confidence
028056,000013: ## that the reconstruction is correct.
028057,000014: ## Reference: pp. 649-652
028058,000015: ## Assembler: yaYUL
028059,000016: ## Contact: Ron Burkey <info@sandroid.org>.
028060,000017: ## Website: www.ibiblio.org/apollo/index.html
028061,000018: ## Mod history: 2019-08-21 MAS Created from Luminary 173.
028062,000019:
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Page 649
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028064,000021: # GROUND TRACKING DETERMINATION PROGRAM P21
028065,000022: # PROGRAM DESCRIPTION
028066,000023: # MOD NO - 1
028067,000024: # MOD BY - N.M.NEVILLE
028068,000025: # FUNCTIONAL DECRIPTION-
028069,000026:
028070,000027: # TO PROVIDE THE ASTRONAUT DETAILS OF THE LM OR CSM GROUND TRACK WITHOUT
028071,000028: # THE NEED FOR GROUND COMMUNICATION (REQUESTED BY DSKY).
028072,000029: # CALLING SEQUENCE -
028073,000030:
028074,000031: # ASTRONAUT REQUEST THROUGH DSKY V37E21E
028075,000032: # SUBROUTINES CALLED-
028076,000033:
028077,000034: # GOPERF4
028078,000035: # GOFLASH
028079,000036: # THISPREC
028080,000037: # OTHPREC
028081,000038: # LAT-LONG
028082,000039: # NORMAL EXIT MODES-
028083,000040:
028084,000041: # ASTRONAUT REQUEST TROUGH DSKY TO TERMINATE PROGRAM V34E
028085,000042: # ALARM OR ABORT EXIT MODES-
028086,000043:
028087,000044: # NONE
028088,000045: # OUTPUT -
028089,000046:
028090,000047: # OCTAL DISPLAY OF OPTION CODE AND VEHICLE WHOSE GROUND TRACK IS TO BE
028091,000048: # COMPUTED
028092,000049: # OPTION CODE 00002
028093,000050: # THIS 00001
028094,000051: # OTHER 00002
028095,000052: # DECIMAL DISPLAY OF TIME TO BE INTEGRATED TO HOURS , MINUTES , SECONDS
028096,000053: # DECIMAL DISPLAY OF LAT,LONG,ALT
028097,000054: # ERASABLE INITIALIZATION REQUIRED
028098,000055:
028099,000056: # AX0 2DEC 4.652459653 E-5 RADIANS %68-69 CONSTANTS"
028100,000057:
028101,000058: # -AY0 2DEC 2.147535898 E-5 RADIANS
028102,000059:
028103,000060: # AZ0 2DEC .7753206164 REVOLUTIONS
028104,000061: # FOR LUNAR ORBITS 504LM VECTOR IS NEEDED
028105,000062:
028106,000063: # 504LM 2DEC -2.700340600 E-5 RADIANS
028107,000064:
028108,000065: # 504LM _2 2DEC -7.514128400 E-4 RADIANS
028109,000066:
028110,000067: # 504LM _4 2DEC _2.553198641 E-4 RADIANS
028111,000068:
028112,000069: # NONE
028113,000070: # DEBRIS
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Page 650
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028115,000072:
028116,000073: # CENTRALS-A,Q,L
028117,000074: # OTHER-THOSE USED BY THE ABOVE LISTED SUBROUTINES
028118,000075: # SEE LEMPREC,LAT-LONG
028119,000076: 35,2455 30,2000 SBANK= LOWSUPER # FOR LOW 2CADR'S.
028120,000077:
028121,000078: 33,2117 BANK 33
028122,000079: 24,2000 SETLOC P20S
028123,000080: 24,2000 BANK
028124,000081:
028125,000082: 24,3440 E7,1762 EBANK= P21TIME
028126,000083: 24,3440 COUNT* $$/P21
028127,000084: 24,3440 34753 PROG21 CAF ONE
028128,000085: 24,3441 55144 TS OPTION2 # ASSUMED VEHICLE IS LM , R2 = 00001
028129,000086: 24,3442 34752 CAF BIT2 # OPTION 2
028130,000087: 24,3443 04616 TC BANKCALL
028131,000088: 24,3444 20634 CADR GOPERF4
028132,000089: 24,3445 06001 TC GOTOPOOH # TERMINATE
028133,000090: 24,3446 03450 TC +2 # PROCEED VALUE OF ASSUMED VEHICLE OK
028134,000091: 24,3447 03442 TC -5 # R2 LOADED THROUGH DSKY
028135,000092: 24,3450 34755 CAF ZERO # INITIAL TIME = PRESENT TIME
028136,000093: 24,3451 55044 TS DSPTEM1
028137,000094: 24,3452 55045 TS DSPTEM1 +1
028138,000095: 24,3453 33627 P21PROG1 CAF V6N34 # LOAD DESIRED TIME OF LAT-LONG.
028139,000096: 24,3454 04616 TC BANKCALL
028140,000097: 24,3455 20477 CADR GOFLASH
028141,000098: 24,3456 06001 TC GOTOPOOH # TERM
028142,000099: 24,3457 03461 TC +2 # PROCEED VALUES OK
028143,000100: 24,3460 03453 TC -5 # TIME LOADED THROUGH DSKY
028144,000101: 24,3461 06042 TC INTPRET
028145,000102: 24,3462 53145 DLOAD BZE
028146,000103: 24,3463 01045 DSPTEM1
028147,000104: 24,3464 51621 P21PRTM
028148,000105: 24,3465 34041 P21PROG2 STCALL TDEC1 # INTEG TO TIME SPECIFIED IN TDEC1
028149,000106: 24,3466 27410 INTSTALL
028150,000107: 24,3467 43014 BON CLEAR
028151,000108: 24,3470 00304 P21FLAG
028152,000109: 24,3471 51507 P21CONT # ON---RECYCLE USING BASE VECTOR
028153,000110: 24,3472 01674 VINTFLAG # OFF--1ST PASS CALL BASE VECTOR
028154,000111: 24,3473 70535 SLOAD SR1
028155,000112: 24,3474 01145 OPTION2
028156,000113: 24,3475 43030 BHIZ SET
028157,000114: 24,3476 51500 +2 # ZERO--THIS VEHICLE(LM)
028158,000115: 24,3477 01474 VINTFLAG # ONE--OTHER VEHICLE(CM)
028159,000116: 24,3500 43014 CLEAR CLEAR
028160,000117: 24,3501 01676 DIM0FLAG
028161,000118: 24,3502 01673 INTYPFLG # PRECISION
028162,000119: 24,3503 77624 CALL
028163,000120: 24,3504 27133 INTEGRV # CALCULATE
028164,000121: 24,3505 77650 GOTO # -AND
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Page 651
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028166,000123: 24,3506 51530 P21VSAVE # -SAVE BASE VECTOR
028167,000124: 24,3507 77775 P21CONT VLOAD
028168,000125: 24,3510 03676 P21BASER # RECYCLE--INTEG FROM BASE VECTOR
028169,000126: 24,3511 25535 STOVL RCV # --POS
028170,000127: 24,3512 03704 P21BASEV
028171,000128: 24,3513 15543 STODL VCV # --VEL
028172,000129: 24,3514 03763 P21TIME
028173,000130: 24,3515 01517 STORE TET # --TIME
028174,000131: 24,3516 43014 CLEAR CLEAR
028175,000132: 24,3517 01676 DIM0FLAG
028176,000133: 24,3520 00263 MOONFLAG
028177,000134: 24,3521 53135 SLOAD BZE
028178,000135: 24,3522 01163 P21ORIG
028179,000136: 24,3523 51526 +3 # ZERO=EARTH
028180,000137: 24,3524 77614 SET # ---2=MOON
028181,000138: 24,3525 00063 MOONFLAG
028182,000139: 24,3526 77624 +3 CALL
028183,000140: 24,3527 27106 INTEGRVS
028184,000141: 24,3530 77745 P21VSAVE DLOAD # SAVE CURRENT BASE VECTOR
028185,000142: 24,3531 00015 TAT
028186,000143: 24,3532 27763 STOVL P21TIME # --TIME
028187,000144: 24,3533 00017 RATT1
028188,000145: 24,3534 27676 STOVL P21BASER # --POS B-29 OR B-27
028189,000146: 24,3535 00025 VATT1
028190,000147: 24,3536 03704 STORE P21BASEV # --VEL B-07 OR B-05
028191,000148: 24,3537 53646 ABVAL SL*
028192,000149: 24,3540 57576 0,2
028193,000150: 24,3541 27712 STOVL P21VEL # VEL/ FOR N91 DISP
028194,000151: 24,3542 00001 RATT
028195,000152: 24,3543 50256 UNIT DOT
028196,000153: 24,3544 00007 VATT # U(R).V
028197,000154: 24,3545 67471 DDV ASIN # U(R).U(V)
028198,000155: 24,3546 03712 P21VEL
028199,000156: 24,3547 03714 STORE P21GAM # SIN-1 U(R).U(V) , -90 TO &90
028200,000157: 24,3550 67334 SXA,2 SLOAD
028201,000158: 24,3551 01162 P21ORIG # 0=EARTH
028202,000159: 24,3552 01145 OPTION2
028203,000160: 24,3553 46142 SR1 BHIZ
028204,000161: 24,3554 51557 +3
028205,000162: 24,3555 77650 GOTO
028206,000163: 24,3556 51562 +4
028207,000164: 24,3557 77614 +3 BON
028208,000165: 24,3560 04307 SURFFLAG
028209,000166: 24,3561 51564 P21DSP
028210,000167: 24,3562 77614 +4 SET
028211,000168: 24,3563 00064 P21FLAG
028212,000169: 24,3564 67214 P21DSP CLEAR SLOAD # GENERATE DISPLAY DATA
028213,000170: 24,3565 01663 LUNAFLAG
028214,000171: 24,3566 00050 X2
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Page 652
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028216,000173: 24,3567 43054 BZE SET
028217,000174: 24,3570 51572 +2 # 0=EARTH
028218,000175: 24,3571 01463 LUNAFLAG
028219,000176: 24,3572 77775 VLOAD
028220,000177: 24,3573 00001 RATT
028221,000178: 24,3574 16032 STODL ALPHAV
028222,000179: 24,3575 00015 TAT
028223,000180: 24,3576 45014 CLEAR CALL
028224,000181: 24,3577 00662 ERADFLAG
028225,000182: 24,3600 26347 LAT-LONG
028226,000183: 24,3601 77605 DMP # MPAC = ALT,METERS B-29
028227,000184: 24,3602 11631 K.01
028228,000185: 24,3603 03716 STORE P21ALT # ALT/100 FOR N91 DISP
028229,000186: 24,3604 77776 EXIT
028230,000187: 24,3605 33626 CAF V06N43 # DISPLAY LAT,LONG,ALT
028231,000188: 24,3606 04616 TC BANKCALL # LAT,LONG = 1/2 REVS B0
028232,000189: 24,3607 20477 CADR GOFLASH # ALT = KM B14
028233,000190: 24,3610 06001 TC GOTOPOOH # TERM
028234,000191: 24,3611 06001 TC GOTOPOOH
028235,000192: 24,3612 06042 TC INTPRET # V32E RECYCLE
028236,000193: 24,3613 43345 DLOAD DAD
028237,000194: 24,3614 03763 P21TIME
028238,000195: 24,3615 11625 600SEC # 600 SECONDS OR 10 MIN
028239,000196: 24,3616 01045 STORE DSPTEM1
028240,000197: 24,3617 77634 RTB
028241,000198: 24,3620 51453 P21PROG1
028242,000199: 24,3621 52034 P21PRTM RTB GOTO
028243,000200: 24,3622 21574 LOADTIME
028244,000201: 24,3623 51465 P21PROG2
028245,000202: 24,3624 00003 25140 600SEC 2DEC 60000 B-28 # 10 MIN
028246,000203:
028247,000204: 24,3626 01453 V06N43 VN 00643
028248,000205: 24,3627 01442 V6N34 VN 00634
028249,000206: 24,3630 00243 32703 K.01 2DEC .01
028250,000207:
End of include-file GROUND_TRACKING_DETERMINATION_PROGRAM_-_P21.agc. Parent file is MAIN.agc