Source Code
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These source-code files are part of a reconstructed copy of Luminary 173, the
second (unflown) release of the Apollo 14 Lunar Module (LM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with reconstructed source code for Luminary 178. Changes
between revision 173 and 178 were backed out, as described by Luminary memo 167
(revision 1). 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 173 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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028047,000002: ## Copyright: Public domain.
028048,000003: ## Filename: GROUND_TRACKING_DETERMINATION_PROGRAM_-_P21.agc
028049,000004: ## Purpose: A section of Luminary revision 173.
028050,000005: ## It is part of the reconstructed source code for the second
028051,000006: ## (unflown) release of the flight software for the Lunar
028052,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
028053,000008: ## The code has been recreated from a reconstructed copy of
028054,000009: ## Luminary 178, as well as Luminary memo 167 (revision 1).
028055,000010: ## It has been adapted such that the resulting bugger words
028056,000011: ## exactly match those specified for Luminary 173 in NASA
028057,000012: ## drawing 2021152N, which gives relatively high confidence
028058,000013: ## that the reconstruction is correct.
028059,000014: ## Reference: pp. 649-652
028060,000015: ## Assembler: yaYUL
028061,000016: ## Contact: Ron Burkey <info@sandroid.org>.
028062,000017: ## Website: www.ibiblio.org/apollo/index.html
028063,000018: ## Mod history: 2019-09-18 MAS Created from Luminary 178.
028064,000019:
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Page 649
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028066,000021: # GROUND TRACKING DETERMINATION PROGRAM P21
028067,000022: # PROGRAM DESCRIPTION
028068,000023: # MOD NO - 1
028069,000024: # MOD BY - N.M.NEVILLE
028070,000025: # FUNCTIONAL DECRIPTION-
028071,000026:
028072,000027: # TO PROVIDE THE ASTRONAUT DETAILS OF THE LM OR CSM GROUND TRACK WITHOUT
028073,000028: # THE NEED FOR GROUND COMMUNICATION (REQUESTED BY DSKY).
028074,000029: # CALLING SEQUENCE -
028075,000030:
028076,000031: # ASTRONAUT REQUEST THROUGH DSKY V37E21E
028077,000032: # SUBROUTINES CALLED-
028078,000033:
028079,000034: # GOPERF4
028080,000035: # GOFLASH
028081,000036: # THISPREC
028082,000037: # OTHPREC
028083,000038: # LAT-LONG
028084,000039: # NORMAL EXIT MODES-
028085,000040:
028086,000041: # ASTRONAUT REQUEST TROUGH DSKY TO TERMINATE PROGRAM V34E
028087,000042: # ALARM OR ABORT EXIT MODES-
028088,000043:
028089,000044: # NONE
028090,000045: # OUTPUT -
028091,000046:
028092,000047: # OCTAL DISPLAY OF OPTION CODE AND VEHICLE WHOSE GROUND TRACK IS TO BE
028093,000048: # COMPUTED
028094,000049: # OPTION CODE 00002
028095,000050: # THIS 00001
028096,000051: # OTHER 00002
028097,000052: # DECIMAL DISPLAY OF TIME TO BE INTEGRATED TO HOURS , MINUTES , SECONDS
028098,000053: # DECIMAL DISPLAY OF LAT,LONG,ALT
028099,000054: # ERASABLE INITIALIZATION REQUIRED
028100,000055:
028101,000056: # AX0 2DEC 4.652459653 E-5 RADIANS %68-69 CONSTANTS"
028102,000057:
028103,000058: # -AY0 2DEC 2.147535898 E-5 RADIANS
028104,000059:
028105,000060: # AZ0 2DEC .7753206164 REVOLUTIONS
028106,000061: # FOR LUNAR ORBITS 504LM VECTOR IS NEEDED
028107,000062:
028108,000063: # 504LM 2DEC -2.700340600 E-5 RADIANS
028109,000064:
028110,000065: # 504LM _2 2DEC -7.514128400 E-4 RADIANS
028111,000066:
028112,000067: # 504LM _4 2DEC _2.553198641 E-4 RADIANS
028113,000068:
028114,000069: # NONE
028115,000070: # DEBRIS
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Page 650
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028117,000072:
028118,000073: # CENTRALS-A,Q,L
028119,000074: # OTHER-THOSE USED BY THE ABOVE LISTED SUBROUTINES
028120,000075: # SEE LEMPREC,LAT-LONG
028121,000076: 35,2455 30,2000 SBANK= LOWSUPER # FOR LOW 2CADR'S.
028122,000077:
028123,000078: 33,2117 BANK 33
028124,000079: 24,2000 SETLOC P20S
028125,000080: 24,2000 BANK
028126,000081:
028127,000082: 24,3440 E7,1762 EBANK= P21TIME
028128,000083: 24,3440 COUNT* $$/P21
028129,000084: 24,3440 34753 PROG21 CAF ONE
028130,000085: 24,3441 55144 TS OPTION2 # ASSUMED VEHICLE IS LM , R2 = 00001
028131,000086: 24,3442 34752 CAF BIT2 # OPTION 2
028132,000087: 24,3443 04616 TC BANKCALL
028133,000088: 24,3444 20634 CADR GOPERF4
028134,000089: 24,3445 06001 TC GOTOPOOH # TERMINATE
028135,000090: 24,3446 03450 TC +2 # PROCEED VALUE OF ASSUMED VEHICLE OK
028136,000091: 24,3447 03442 TC -5 # R2 LOADED THROUGH DSKY
028137,000092: 24,3450 34755 CAF ZERO # INITIAL TIME = PRESENT TIME
028138,000093: 24,3451 55044 TS DSPTEM1
028139,000094: 24,3452 55045 TS DSPTEM1 +1
028140,000095: 24,3453 33627 P21PROG1 CAF V6N34 # LOAD DESIRED TIME OF LAT-LONG.
028141,000096: 24,3454 04616 TC BANKCALL
028142,000097: 24,3455 20477 CADR GOFLASH
028143,000098: 24,3456 06001 TC GOTOPOOH # TERM
028144,000099: 24,3457 03461 TC +2 # PROCEED VALUES OK
028145,000100: 24,3460 03453 TC -5 # TIME LOADED THROUGH DSKY
028146,000101: 24,3461 06042 TC INTPRET
028147,000102: 24,3462 53145 DLOAD BZE
028148,000103: 24,3463 01045 DSPTEM1
028149,000104: 24,3464 51621 P21PRTM
028150,000105: 24,3465 34041 P21PROG2 STCALL TDEC1 # INTEG TO TIME SPECIFIED IN TDEC1
028151,000106: 24,3466 27410 INTSTALL
028152,000107: 24,3467 43014 BON CLEAR
028153,000108: 24,3470 00304 P21FLAG
028154,000109: 24,3471 51507 P21CONT # ON---RECYCLE USING BASE VECTOR
028155,000110: 24,3472 01674 VINTFLAG # OFF--1ST PASS CALL BASE VECTOR
028156,000111: 24,3473 70535 SLOAD SR1
028157,000112: 24,3474 01145 OPTION2
028158,000113: 24,3475 43030 BHIZ SET
028159,000114: 24,3476 51500 +2 # ZERO--THIS VEHICLE(LM)
028160,000115: 24,3477 01474 VINTFLAG # ONE--OTHER VEHICLE(CM)
028161,000116: 24,3500 43014 CLEAR CLEAR
028162,000117: 24,3501 01676 DIM0FLAG
028163,000118: 24,3502 01673 INTYPFLG # PRECISION
028164,000119: 24,3503 77624 CALL
028165,000120: 24,3504 27133 INTEGRV # CALCULATE
028166,000121: 24,3505 77650 GOTO # -AND
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Page 651
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028168,000123: 24,3506 51530 P21VSAVE # -SAVE BASE VECTOR
028169,000124: 24,3507 77775 P21CONT VLOAD
028170,000125: 24,3510 03676 P21BASER # RECYCLE--INTEG FROM BASE VECTOR
028171,000126: 24,3511 25535 STOVL RCV # --POS
028172,000127: 24,3512 03704 P21BASEV
028173,000128: 24,3513 15543 STODL VCV # --VEL
028174,000129: 24,3514 03763 P21TIME
028175,000130: 24,3515 01517 STORE TET # --TIME
028176,000131: 24,3516 43014 CLEAR CLEAR
028177,000132: 24,3517 01676 DIM0FLAG
028178,000133: 24,3520 00263 MOONFLAG
028179,000134: 24,3521 53135 SLOAD BZE
028180,000135: 24,3522 01163 P21ORIG
028181,000136: 24,3523 51526 +3 # ZERO=EARTH
028182,000137: 24,3524 77614 SET # ---2=MOON
028183,000138: 24,3525 00063 MOONFLAG
028184,000139: 24,3526 77624 +3 CALL
028185,000140: 24,3527 27106 INTEGRVS
028186,000141: 24,3530 77745 P21VSAVE DLOAD # SAVE CURRENT BASE VECTOR
028187,000142: 24,3531 00015 TAT
028188,000143: 24,3532 27763 STOVL P21TIME # --TIME
028189,000144: 24,3533 00017 RATT1
028190,000145: 24,3534 27676 STOVL P21BASER # --POS B-29 OR B-27
028191,000146: 24,3535 00025 VATT1
028192,000147: 24,3536 03704 STORE P21BASEV # --VEL B-07 OR B-05
028193,000148: 24,3537 53646 ABVAL SL*
028194,000149: 24,3540 57576 0,2
028195,000150: 24,3541 27712 STOVL P21VEL # VEL/ FOR N91 DISP
028196,000151: 24,3542 00001 RATT
028197,000152: 24,3543 50256 UNIT DOT
028198,000153: 24,3544 00007 VATT # U(R).V
028199,000154: 24,3545 67471 DDV ASIN # U(R).U(V)
028200,000155: 24,3546 03712 P21VEL
028201,000156: 24,3547 03714 STORE P21GAM # SIN-1 U(R).U(V) , -90 TO &90
028202,000157: 24,3550 67334 SXA,2 SLOAD
028203,000158: 24,3551 01162 P21ORIG # 0=EARTH
028204,000159: 24,3552 01145 OPTION2
028205,000160: 24,3553 46142 SR1 BHIZ
028206,000161: 24,3554 51557 +3
028207,000162: 24,3555 77650 GOTO
028208,000163: 24,3556 51562 +4
028209,000164: 24,3557 77614 +3 BON
028210,000165: 24,3560 04307 SURFFLAG
028211,000166: 24,3561 51564 P21DSP
028212,000167: 24,3562 77614 +4 SET
028213,000168: 24,3563 00064 P21FLAG
028214,000169: 24,3564 67214 P21DSP CLEAR SLOAD # GENERATE DISPLAY DATA
028215,000170: 24,3565 01663 LUNAFLAG
028216,000171: 24,3566 00050 X2
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Page 652
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028218,000173: 24,3567 43054 BZE SET
028219,000174: 24,3570 51572 +2 # 0=EARTH
028220,000175: 24,3571 01463 LUNAFLAG
028221,000176: 24,3572 77775 VLOAD
028222,000177: 24,3573 00001 RATT
028223,000178: 24,3574 16032 STODL ALPHAV
028224,000179: 24,3575 00015 TAT
028225,000180: 24,3576 45014 CLEAR CALL
028226,000181: 24,3577 00662 ERADFLAG
028227,000182: 24,3600 26347 LAT-LONG
028228,000183: 24,3601 77605 DMP # MPAC = ALT,METERS B-29
028229,000184: 24,3602 11631 K.01
028230,000185: 24,3603 03716 STORE P21ALT # ALT/100 FOR N91 DISP
028231,000186: 24,3604 77776 EXIT
028232,000187: 24,3605 33626 CAF V06N43 # DISPLAY LAT,LONG,ALT
028233,000188: 24,3606 04616 TC BANKCALL # LAT,LONG = 1/2 REVS B0
028234,000189: 24,3607 20477 CADR GOFLASH # ALT = KM B14
028235,000190: 24,3610 06001 TC GOTOPOOH # TERM
028236,000191: 24,3611 06001 TC GOTOPOOH
028237,000192: 24,3612 06042 TC INTPRET # V32E RECYCLE
028238,000193: 24,3613 43345 DLOAD DAD
028239,000194: 24,3614 03763 P21TIME
028240,000195: 24,3615 11625 600SEC # 600 SECONDS OR 10 MIN
028241,000196: 24,3616 01045 STORE DSPTEM1
028242,000197: 24,3617 77634 RTB
028243,000198: 24,3620 51453 P21PROG1
028244,000199: 24,3621 52034 P21PRTM RTB GOTO
028245,000200: 24,3622 21574 LOADTIME
028246,000201: 24,3623 51465 P21PROG2
028247,000202: 24,3624 00003 25140 600SEC 2DEC 60000 B-28 # 10 MIN
028248,000203:
028249,000204: 24,3626 01453 V06N43 VN 00643
028250,000205: 24,3627 01442 V6N34 VN 00634
028251,000206: 24,3630 00243 32703 K.01 2DEC .01
028252,000207:
End of include-file GROUND_TRACKING_DETERMINATION_PROGRAM_-_P21.agc. Parent file is MAIN.agc