Source Code
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These source-code files are part of a reconstructed copy of Artemis 071, the
first release of the Apollo 15 through 17 Command Module (CM) Apollo Guidance
Computer (AGC) software.
The reconstruction began with source code of Artemis 072 previously transcribed
from a digitized copy of that program. The code was then updated by undoing
changes between the two versions. The reconstruction was verified by matching
memory-bank checksums to those listed in drawing 2021154-. Note that page
numbers in the reconstructed code match those on the Artemis 072 printout,
although the changed code would likely have changed page numbers for a real
Artemis 071 listing.
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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041280,000002: ## Copyright: Public domain.
041281,000003: ## Filename: S-BAND_ANTENNA_FOR_CM.agc
041282,000004: ## Purpose: A section of Artemis revision 071.
041283,000005: ## It is part of the reconstructed source code for the first
041284,000006: ## release of the flight software for the Command Module's
041285,000007: ## (CM) Apollo Guidance Computer (AGC) for Apollo 15 through
041286,000008: ## 17. The code has been recreated from a copy of Artemis 072.
041287,000009: ## It has been adapted such that the resulting bugger words
041288,000010: ## exactly match those specified for Artemis 071 in NASA
041289,000011: ## drawing 2021154-, which gives relatively high confidence
041290,000012: ## that the reconstruction is correct.
041291,000013: ## Reference: 940
041292,000014: ## Assembler: yaYUL
041293,000015: ## Contact: Ron Burkey <info@sandroid.org>.
041294,000016: ## Website: www.ibiblio.org/apollo/index.html
041295,000017: ## Mod history: 2019-08-14 MAS Created from Artemis 072.
041296,000018:
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Page 940
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041298,000020: 42,2000 SETLOC SBAND
041299,000021: 42,2000 BANK
041300,000022:
041301,000023: 42,3504 COUNT* $$/R05
041302,000024: 42,3504 E4,1417 EBANK= EMSALT
041303,000025:
041304,000026: 42,3504 06006 SBANDANT TC INTPRET
041305,000027: 42,3505 45034 RTB CALL
041306,000028: 42,3506 51751 LOADTIME # PICKUP CURRENT TIME SCALED B-28
041307,000029: 42,3507 47530 CDUTRIG # COMPUTE SINES AND COSINES OF CDU ANGLES
041308,000030: 42,3510 34041 STCALL TDEC1 # ADVANCE INTEGRATION TO TIME IN TDEC1
041309,000031: 42,3511 27170 CSMCONIC # USING CONIC INTEGRATION
041310,000032: 42,3512 46135 SLOAD BHIZ # ORIGIN OF REFERENCE INERTIAL SYSTEM IS
041311,000033: 42,3513 00050 X2 # EARTH = 0, MOON = 2
041312,000034: 42,3514 65527 EISOI
041313,000035: 42,3515 77775 VLOAD
041314,000036: 42,3516 00001 RATT
041315,000037: 42,3517 00003 STORE RCM # MOVE RATT TO PREVENT WIPEOUT
041316,000038: 42,3520 45145 DLOAD CALL # MOON, PUSH ON
041317,000039: 42,3521 00015 TAT # GET ORIGINAL TIME
041318,000040: 42,3522 54141 LUNPOS # COMPUTE POSITION VECTOR OF MOON
041319,000041: 42,3523 57455 VAD VCOMP # R= -(REM+RCM) = NEG. OF S/C POS. VEC
041320,000042: 42,3524 00003 RCM
041321,000043: 42,3525 77650 GOTO
041322,000044: 42,3526 65531 EISOI +2
041323,000045: 42,3527 57575 EISOI VLOAD VCOMP # EARTH, R= -RCM
041324,000046: 42,3530 00001 RATT
041325,000047: 42,3531 64201 SETPD MXV # RCS TO STABLE MEMBER- B-1X B-29X B+1
041326,000048: 42,3532 00003 2D # 2D
041327,000049: 42,3533 01734 REFSMMAT # STABLE MEMBER. B-1X B-29X B+1= B-29
041328,000050: 42,3534 65372 VSL1 PDDL # 8D
041329,000051: 42,3535 15336 HI6ZEROS
041330,000052: 42,3536 24025 STOVL YAWANG # ZERO OUT YAWANG, SET UP FOR SMNB
041331,000053: 42,3537 00003 RCM # TRANSFORMATION. SM COORD. SCALED B-29
041332,000054: 42,3540 77624 CALL
041333,000055: 42,3541 47633 *SMNB*
041334,000056: 42,3542 00003 STORE R # SAVE NAV. BASE COORDINATES
041335,000057: 42,3543 63256 UNIT PDVL # 14D
041336,000058: 42,3544 00003 R
041337,000059: 42,3545 72431 VPROJ VSL2 # COMPUTE PROJECTION OF VECTOR INTO CM
041338,000060: 42,3546 15330 HIUNITZ # XY-PLANE, R-(R.UZ)UZ
041339,000061: 42,3547 40045 BVSU BOV # CLEAR OVERFLOW INDICATOR IF SET
041340,000062: 42,3550 00003 R
041341,000063: 42,3551 65552 COVCNV
041342,000064: 42,3552 40056 COVCNV UNIT BOV # TEST OVERFLOW FOR INDICATION OF NULL
041343,000065: 42,3553 65567 NOADJUST # VECTOR
041344,000066: 42,3554 50206 PUSH DOT # 20D
041345,000067: 42,3555 15334 HIUNITX # COMPUTE YAW ANGLE = ACOS (URP.UX)
041346,000068: 42,3556 65552 SL1 ACOS # REVOLUTIONS SCALED B0
041347,000069: 42,3557 50315 PDVL DOT # 22D YAWANG
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Page 941
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041349,000071: 42,3560 00017 URP
041350,000072: 42,3561 15332 HIUNITY # COMPUTE FOLLOWING- URP.UY
041351,000073: 42,3562 51152 SL1 BPL # POSITIVE
041352,000074: 42,3563 65567 NOADJUST # YES, 0- 180 DEGREES
041353,000075: 42,3564 45345 DLOAD DSU # NO, 181-360 DEGREES 20D
041354,000076: 42,3565 15344 DPPOSMAX # COMPUTE 2 PI MINUS YAW ANGLE
041355,000077: 42,3566 77606 PUSH # 22D YAWANG
041356,000078: 42,3567 50375 NOADJUST VLOAD DOT # COMPUTE PITCH ANGLE
041357,000079: 42,3570 00011 UR # ACOS (UR.UZ) - PI/2
041358,000080: 42,3571 15330 HIUNITZ
041359,000081: 42,3572 65552 SL1 ACOS # REVOLUTIONS B0
041360,000082: 42,3573 77625 DSU
041361,000083: 42,3574 15326 HIDP1/4
041362,000084: 42,3575 16312 STODL RHOSB
041363,000085: 42,3576 00025 YAWANG
041364,000086: 42,3577 02314 STORE GAMMASB # PATCH FOR CHECKOUT
041365,000087: 42,3600 77776 EXIT
041366,000088: 42,3601 35047 CAF PRIO5
041367,000089: 42,3602 05176 TC PRIOCHNG
041368,000090:
041369,000091: 42,3603 31247 CA EXTVBACT # IS BIT 5 STILL ON
041370,000092: 42,3604 74764 MASK BIT5
041371,000093: 42,3605 00006 EXTEND
041372,000094: 42,3606 15524 BZF ENDEXT # NO, WE HAVE BEEN ANSWERED
041373,000095: 42,3607 33625 CAF V06N51 # DISPLAY ANGLES
041374,000096: 42,3610 04636 TC BANKCALL
041375,000097: 42,3611 20607 CADR GOMARKFR
041376,000098: 42,3612 05626 TC B5OFF # TERMINATE
041377,000099: 42,3613 05626 TC B5OFF
041378,000100: 42,3614 05205 TC ENDOFJOB # RECYCLE
041379,000101: 42,3615 34766 CAF BIT3 # IMMEDIATE RETURN
041380,000102: 42,3616 05516 TC BLANKET # BLANK R3
041381,000103: 42,3617 34755 CAF PRIO4
041382,000104: 42,3620 05176 TC PRIOCHNG
041383,000105:
041384,000106: 42,3621 34770 CAF BIT1 # DELAY MINIMUM TIME TO ALLOW DISPLAY IN
041385,000107: 42,3622 04636 TC BANKCALL
041386,000108: 42,3623 01731 CADR DELAYJOB
041387,000109: 42,3624 13504 TCF SBANDANT
041388,000110: 42,3625 01463 V06N51 VN 0651
041389,000111: 42,3626 RCM EQUALS 2D
041390,000112: 42,3626 UR EQUALS 8D
041391,000113: 42,3626 URP EQUALS 14D
041392,000114: 42,3626 YAWANG EQUALS 20D
041393,000115: 42,3626 PITCHANG EQUALS 22D
041394,000116: 42,3626 0000002 R EQUALS RCM
041395,000117: 42,3626 30,2000 SBANK= LOWSUPER
041396,000118:
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Page 942
This page contains only assembler-generated messages.
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041399,000121:
041400,000122:
End of include-file S-BAND_ANTENNA_FOR_CM.agc. Parent file is MAIN.agc