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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002277,000002: ## Copyright: Public domain.
002278,000003: ## Filename: INPUT_OUTPUT_CHANNEL_BIT_DESCRIPTIONS.agc
002279,000004: ## Purpose: A section of Luminary revision 163.
002280,000005: ## It is part of the reconstructed source code for the first
002281,000006: ## (unflown) release of the flight software for the Lunar
002282,000007: ## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
002283,000008: ## The code has been recreated from a reconstructed copy of
002284,000009: ## Luminary 173, as well as Luminary memos 157 amd 158.
002285,000010: ## It has been adapted such that the resulting bugger words
002286,000011: ## exactly match those specified for Luminary 163 in NASA
002287,000012: ## drawing 2021152N, which gives relatively high confidence
002288,000013: ## that the reconstruction is correct.
002289,000014: ## Reference: pp. 55-61
002290,000015: ## Assembler: yaYUL
002291,000016: ## Contact: Ron Burkey <info@sandroid.org>.
002292,000017: ## Website: www.ibiblio.org/apollo/index.html
002293,000018: ## Mod history: 2019-08-21 MAS Created from Luminary 173.
002294,000019:
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Page 55
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002296,000021:
002297,000022:
002298,000023: # *** CHANNEL DESCRIPTIONSF WORDS ARE ALLOCATED IN ERASABLE ASSIGNMENTS ***
002299,000024:
002300,000025:
002301,000026: # CHANNEL 1 IDENTICAL TO COMPUTER REGISTER L (0001)
002302,000027:
002303,000028:
002304,000029: # CHANNEL 2 IDENTICAL TO COMPUTER REGISTER Q (0002)
002305,000030:
002306,000031:
002307,000032: # CHANNEL 3 HISCALAR; INPUT CHANNEL; MOST SIGNIFICANT 14 BITS FROM 33 STAGE BINARY COUNTER. SCALE
002308,000033: # FACTOR IS B23 IN CSEC, SO MAX VALUE ABOUT 23.3 HOURS AND LEAST SIGNIFICANT BIT 5.12 SECS.
002309,000034:
002310,000035:
002311,000036: # CHANNEL 4 LOSCALAR; INPUT CHANNEL; NEXT MOST SIGNIFICANT 14 BITS FROM THE 33 STAGE BINARY COUNTER
002312,000037: # ASSOCIATED WITH CHANNEL 3. SCALE FACTOR IS B9 IN CSEC. SO MAX VAL IS 5.12 SEC AND LEAST
002313,000038: # SIGNIFICANT BIT IS 1/3200 SEC. SCALE FACTOR OF D.P. WORD WITH CHANNEL 3 IS B23 CSEC.
002314,000039:
002315,000040:
002316,000041: # CHANNEL 5 PYJETS; OUTPUT CHANNEL; PITCH RCS JET CONTROL. (REACTION CONTROL SYSTEM) USES BITS 1-8.
002317,000042:
002318,000043:
002319,000044: # CHANNEL 6 ROLLJETS; OUTPUT CHANNEL; ROLL RCS JET CONTROL. (REACTION CONTROL SYSTEM) USES BIT 1-8.
002320,000045:
002321,000046:
002322,000047: # CHANNEL 7 SUPERBNK; OUTPUT CHANNEL; NOT RESET BY RESTART; FIXED EXTENSION BITS USED TO SELECT THE
002323,000048: # APPROPRIATE FIXED MEMORY BANK IF FBANK IS 30 OCTAL OR MORE. USES BITS 5-7.
002324,000049:
002325,000050:
002326,000051: # CHANNEL 10 OUTO; OUTPUT CHANNEL; REGISTER USED TO TRANSMIT LATCHING-RELAY DRIVING INFORMATION FOR
002327,000052: # THE DISPLAY SYSTEM. BITS 15-12 ARE SET TO THE ROW NUMBER (1-14 OCTAL) OF THE RELAY TO BE
002328,000053: # CHANGED AND BITS 11-1 CONTAIN THE REQUIRED SETTINGS FOR THE RELAYS IN THE ROW.
002329,000054:
002330,000055:
002331,000056: # CHANNEL 11 DSALMOUT; OUTPUT CHANNEL; REGISTER WHOSE BITS ARE USED FOR ENGINE ON-OFF CONTROL AND TO
002332,000057: # DRIVE INDIVIDUAL INDICATORS OF THE DISPLAY SYSTEM. BITS 1-7 ARE A RELAYS.
002333,000058:
002334,000059: # BIT 1 ISS WARNING
002335,000060:
002336,000061: # BIT 2 LIGHT COMPUTER ACTIVITY LAMP
002337,000062:
002338,000063: # BIT 3 LIGHT UPLINK ACTIVITY LAMP
002339,000064:
002340,000065: # BIT 4 LIGHT TEMP CAUTION LAMP
002341,000066:
002342,000067: # BIT 5 LIGHT KEYBOARD RELEASE LAMP
002343,000068:
002344,000069: # BIT 6 FLASH VERB AND NOUN LAMPS
002345,000070:
002346,000071: # BIT 7 LIGHT OPERATOR ERROR LAMP
002347,000072:
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002349,000074: # BIT 8 SPARE
002350,000075:
002351,000076: # BIT 9 TEST CONNECTOR OUTBIT
002352,000077:
002353,000078: # BIT 10 CAUTION RESET
002354,000079:
002355,000080: # BIT 11 SPARE
002356,000081:
002357,000082: # BIT 12 SPARE
002358,000083:
002359,000084: # BIT 13 ENGINE ON
002360,000085:
002361,000086: # BIT 14 ENGINE OFF
002362,000087:
002363,000088: # BIT 15 SPARE
002364,000089:
002365,000090:
002366,000091: # CHANNEL 12 CHAN12; OUTPUT CHANNEL; BITS USED TO DRIVE NAVIGATION AND SPAECRAFT HARDWARE
002367,000092:
002368,000093: # BIT 1 ZERO RR CDU; CDU'S GIVE RRADAR INFORMATION FOR LM
002369,000094:
002370,000095: # BIT 2 ENABLE CDU RADAR ERROR COUNTERS
002371,000096:
002372,000097: # BIT 3 NOT USED
002373,000098:
002374,000099: # BIT 4 COARSE ALIGN ENABLE OF IMU
002375,000100:
002376,000101: # BIT 5 ZERO IMU CDU'S
002377,000102:
002378,000103: # BIT 6 ENABLE IMU ERROR COUNTER, CDU ERROR COUNTER.
002379,000104:
002380,000105: # BIT 7 SPARE
002381,000106:
002382,000107: # BIT 8 DISPLAY INERTIAL DATA
002383,000108:
002384,000109: # BIT 9 -PITCH GIMBAL TRIM (BELL MOTION) DESCENT ENGINE
002385,000110:
002386,000111: # BIT 10 +PITCH GIMBAL TRIM (BELL MOTION) DESCENT ENGINE
002387,000112:
002388,000113: # BIT 11 -ROLL GIMBAL TRIM (BELL MOTION) DESCENT ENGINE
002389,000114:
002390,000115: # BIT 12 +ROLL GIMBAL TRIM (BELL MOTION) DESCENT ENGINE
002391,000116:
002392,000117: # BIT 13 LR POSITION 2 COMMAND
002393,000118:
002394,000119: # BIT 14 ENABLE RENDESVOUS RADAR LOCK-ON;AUTO ANGLE TRACK'G
002395,000120:
002396,000121: # BIT 15 ISS TURN ON DELAY COMPLETE
002397,000122:
002398,000123:
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002400,000125: # CHANNEL 13 CHAN13; OUTPUT CHANNEL
002401,000126:
002402,000127: # BIT 1 RADAR C PROPER SETTING OF THE A,B,C MATRIX
002403,000128: # BIT 2 RADAR B SELECTS CERTAIN RADAR
002404,000129: # BIT 3 RADAR A PARAMETERS TO BE READ.
002405,000130:
002406,000131: # BIT 4 RADAR ACTIVITY
002407,000132:
002408,000133: # BIT 5 NOT USED (CONNECTS AN ALTERNATE INPUT TO UPLINK)
002409,000134:
002410,000135: # BIT 6 SPARE
002411,000136:
002412,000137: # BIT 7 DOWNLINK TELEMETRY WORD ORDER CODE BIT
002413,000138:
002414,000139: # BIT 8 RHC COUNTER ENABLE (READ HAND CONTROLLER ANGLES)
002415,000140:
002416,000141: # BIT 9 START RHC READ INTO COUNTERS IF BIT 8 SET
002417,000142:
002418,000143: # BIT 10 TEST ALARMS, TEST DSKY LIGHTS
002419,000144:
002420,000145: # BIT 11 ENABLE STANDBY
002421,000146:
002422,000147: # BIT 12 RESET TRAP 31-A ALWAYS APPEAR TO BE SET TO 0
002423,000148:
002424,000149: # BIT 13 RESET TRAP 31-B ALWAYS APPEAR TO BE SET TO 0
002425,000150:
002426,000151: # BIT 14 RESET TRAP 32 ALWAYS APPEAR TO BE SET TO 0
002427,000152:
002428,000153: # BIT 15 ENABLE T6 RUPT
002429,000154:
002430,000155:
002431,000156: # CHANNEL 14 CHAN14; OUTPUT CHANNEL; USED TO CONTROL COMPUTER COUNTER CELLS (CDU,GYRO,SPACECRAFT FUNC.
002432,000157:
002433,000158: # BIT 1 OUTLINK ACTIVITY (NOT USED)
002434,000159:
002435,000160: # BIT 2 ALTITUDE RATE OR ALTITIDE SELECTOR
002436,000161:
002437,000162: # BIT 3 ALTITUDE METER ACTIVITY
002438,000163:
002439,000164: # BIT 4 THRUST DRIVE ACTIVITY FOR DESCENT ENGINE
002440,000165:
002441,000166: # BIT 5 SPARE
002442,000167:
002443,000168: # BIT 6 GYRO ENABLE POWER FOR PULSES
002444,000169:
002445,000170: # BIT 7 GYRO SELECT B PAIR OF BITS IDENTIFIES AXIS OF -
002446,000171: # BIT 8 GYRO SELECT A GYRO SYSTEM TO BE TORQUED.
002447,000172:
002448,000173: # BIT 9 GYRO TORQUING COMMAND IN NEGATIVE DIRECTION
002449,000174:
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002451,000176: # BIT 10 GYRO ACTIVITY
002452,000177:
002453,000178: # BIT 11 DRIVE CDU S
002454,000179:
002455,000180: # BIT 12 DRIVE CDU T
002456,000181:
002457,000182: # BIT 13 DRIVE CDU Z
002458,000183:
002459,000184: # BIT 14 DRIVE CDU Y
002460,000185:
002461,000186: # BIT 15 DRIVE CDU X
002462,000187:
002463,000188:
002464,000189: # CHANNEL 15 MNKEYIN; INPUT CHANNEL;KEY CODE INPUT FROM KEYBOARD OF DSKY, SENSED BY PROGRAM WHEN
002465,000190: # PROGRAM INTERRUPT #5 IS RECEIVED. USES BITS 5-1
002466,000191:
002467,000192:
002468,000193: # CHANNEL 16 NAVKEYIN; INPUT CHANNEL; OPTICS MARK INFORMATION AND NAVIGA ION PANEL DSKY (CM) OR THRUST
002469,000194: # CONTROL (LM) SENSED BY PROGRAM WHEN PROGRAM INTER-RUPT #6 IS RECEIVED. USES BITS 3-7 ONLY.
002470,000195:
002471,000196: # BIT 1 NOT ASSIGNED
002472,000197:
002473,000198: # BIT 2 NOT ASSIGNED
002474,000199:
002475,000200: # BIT 3 OPTICS X-AXIS MARK SIGNAL FOR ALIGN OPTICAL TSCOPE
002476,000201:
002477,000202: # BIT 4 OPTICS Y-AXIS MARK SIGNAL FOR AOT
002478,000203:
002479,000204: # BIT 5 OPTICS MARK REJECT SIGNAL
002480,000205:
002481,000206: # BIT 6 DESCENT+ ; CREW DESIRED SLOWING RATE OF DESCENT
002482,000207:
002483,000208: # BIT 7 DESCENT- ; CREW DESIRED SPEEDING UP RATE OF D'CENT
002484,000209:
002485,000210:
002486,000211: # NOTE: ALL BITS IN CHANNELS 30-33 ARE INVERTED AS SENSED BY THE PROGRAM, SO THAT A VALUE OF ZERO MEANS
002487,000212: # THAT THE INDICATED SIGNAL IS PRESENT.
002488,000213:
002489,000214:
002490,000215: # CHANNEL 30 INPUT CHANNEL
002491,000216:
002492,000217: # BIT 1 ABORT WITH DESCENT STAGE
002493,000218:
002494,000219: # BIT 2 UNUSED
002495,000220:
002496,000221: # BIT 3 ENGINE ARMED SIGNAL
002497,000222:
002498,000223: # BIT 4 ABORT WITH ASCENT ENGINE STAGE
002499,000224:
002500,000225: # BIT 5 AUTO THROTTLE; COMPUTER CONTROL OF DESCENT ENGINE
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002502,000227: # BIT 6 DISPLAY INERTIAL DATA
002503,000228:
002504,000229: # BIT 7 RR CDU FAIL
002505,000230:
002506,000231: # BIT 8 SPARE
002507,000232:
002508,000233: # BIT 9 IMU OPERATE WITH NO MALFUNCTION
002509,000234:
002510,000235: # BIT 10 LM COMPUTER (NOT AGS) HAS CONTROL OF LM
002511,000236:
002512,000237: # BIT 11 IMU CAGE COMMAND TO DRIVE IMU GIMBAL ANGLES TO 0.
002513,000238:
002514,000239: # BIT 12 IMU CDU FAIL (MALFUNCTION OF IMU CDU,S)
002515,000240:
002516,000241: # BIT 13 IMU FAIL (MALFUNCTION OF IMU STABILIZATION LOOPS)
002517,000242:
002518,000243: # BIT 14 ISS TURN ON REQUESTED
002519,000244:
002520,000245: # BIT 15 TEMPERATURE OF STABLE MEMBER WITHIN DESIGN LIMITS
002521,000246:
002522,000247:
002523,000248: # CHANNEL 31 INPUT CHANNEL; BITS ASSOCIATED WITH THE ATTITUDE CONTROLLER, TRANSLATIONAL CONTROLLER,
002524,000249: # AND SPACECRAFT ATTITUDE CONTROL; USED BY RCS DAP
002525,000250:
002526,000251: # BIT 1 ROTATION (BY RHC) COMMANDED IN POSITIVE PITCH DIRECTION; MUST BE IN MINIMUM IMPULSE MODE.
002527,000252: # ALSO POSITIVE ELEVATION CHANGE FOR LANDING POINT DESIGNATOR
002528,000253:
002529,000254: # BIT 2 AS BIT 1 EXCEPT NEGATIVE PITCH AND ELEVATION
002530,000255:
002531,000256: # BIT 3 ROTATION (BY RHC) COMMANDED IN POSITIVE YAW DIRECTION; MUST BE IN MINUMUM IMPULSE MODE.
002532,000257:
002533,000258: # BIT 4 AS BIT 3 EXCEPT NEGATIVE YAW
002534,000259:
002535,000260: # BIT 5 ROTATION (BY RHC) COMMANDED IN POSITIVE ROLL DIRECTION; MUST BE IN MINIMUM IMPULSE MODE.
002536,000261: # ALSO POSITIVE AZIMUTH CHANGE FOR LANDING POINT DESIGNATOR
002537,000262:
002538,000263: # BIT 6 AS BIT 5 EXCEPT NEGATIVE ROLL AND AZIMUTH
002539,000264:
002540,000265: # BIT 7 TRANSLATION IN +X DIRECTION COMMANDED BY THC
002541,000266:
002542,000267: # BIT 8 TRANSLATION IN -X DIRECTION COMMANDED BY THC
002543,000268:
002544,000269: # BIT 9 TRANSLATION IN +Y DIRECTION COMMANDED BY THC
002545,000270:
002546,000271: # BIT 10 TRANSLATION IN -Y DIRECTION COMMANDED BY THC
002547,000272:
002548,000273: # BIT 11 TRANSLATION IN +Z DIRECTION COMMANDED BY THC
002549,000274:
002550,000275: # BIT 12 TRANSLATION IN -Z DIRECTION COMMANDED BY THC
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002552,000277:
002553,000278: # BIT 13 ATTITUDE HOLD MODE ON SCS MODE CONTROL SWITCH
002554,000279:
002555,000280: # BIT 14 AUTO STABILIZATION OF ATTITUDE ON SCS MODE SWITCH
002556,000281:
002557,000282: # BIT 15 ATTITUDE CONTROL OUT OF DETENT (RHC NOT IN NEUTRAL
002558,000283:
002559,000284:
002560,000285: # CHANNEL 32 INPUT CHANNEL.
002561,000286:
002562,000287: # BIT 1 THRUSTERS 2 & 4 DISABLED BY CREW
002563,000288:
002564,000289: # BIT 2 THRUSTERS 5 & 8 DISABLED BY CREW
002565,000290:
002566,000291: # BIT 3 THRUSTERS 1 & 3 DISABLED BY CREW
002567,000292:
002568,000293: # BIT 4 THRUSTERS 6 & 7 DISABLED BY CREW
002569,000294:
002570,000295: # BIT 5 THRUSTERS 14 & 16 DISABLED BY CREW
002571,000296:
002572,000297: # BIT 6 THRUSTERS 13 & 15 DISABLED BY CREW
002573,000298:
002574,000299: # BIT 7 THRUSTERS 9 & 12 DISABLED BY CREW
002575,000300:
002576,000301: # BIT 8 THRUSTERS 10 & 11 DISABLED BY CREW
002577,000302:
002578,000303: # BIT 9 DESCENT ENGINE GIMBALS DISABLED BY CREW
002579,000304:
002580,000305: # BIT 10 APPARENT DESCENT ENGINE GIMBAL FAILURE
002581,000306:
002582,000307: # BIT 14 INDICATES PROCEED KEY IS DEPRESSED
002583,000308:
002584,000309:
002585,000310: # CHANNEL 33 CHAN33; INPUT CHANNEL; FOR HARDWARE STATUS AND COMMAND INFORMATION. BITS 15-11 ARE FLIP-
002586,000311: # FLOP BITS RESET BY A CHANNEL "WRITE" COMMAND THAT ARE RESET BY A RESTART & BY T4RUPT LOOP.
002587,000312:
002588,000313: # BIT 1 SPARE
002589,000314:
002590,000315: # BIT 2 RR AUTO-POWER ON
002591,000316:
002592,000317: # BIT 3 RR RANGE LOW SCALE
002593,000318:
002594,000319: # BIT 4 RR DATA GOOD
002595,000320:
002596,000321: # BIT 5 LR RANGE DATA GOOD
002597,000322:
002598,000323: # BIT 6 LR POS1
002599,000324:
002600,000325: # BIT 7 LR POS2
002601,000326:
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002603,000328: # BIT 8 LR VEL DATA GOOD
002604,000329:
002605,000330: # BIT 9 LR RANGE LOW SCALE
002606,000331:
002607,000332: # BIT 10 BLOCK UPLINK INPUT
002608,000333:
002609,000334: # BIT 11 UPLINK TOO FAST
002610,000335:
002611,000336: # BIT 12 DOWNLINK TOO FAST
002612,000337:
002613,000338: # BIT 13 PIPA FAIL
002614,000339:
002615,000340: # BIT 14 WARNING OF REPEATED ALARMS: RESTART,COUNTER FAIL, VOLTAGE FAIL,AND SCALAR DOUBLE.
002616,000341:
002617,000342: # BIT 15 LGC OSCILLATOR STOPPED
002618,000343:
002619,000344:
002620,000345: # CHANNEL 34 DNT M1; OUTPUT CHANNEL; DOWNLINK 1 FIRST OF TWO WORDS SERIALIZATION.
002621,000346: # CHANNEL 35 DNT M2; OUTPUT CHANNEL DOWNLINK 2 SOCOND OF TWO WORDS SERIALIZATION.
End of include-file INPUT_OUTPUT_CHANNEL_BIT_DESCRIPTIONS.agc. Parent file is MAIN.agc