# Copyright: Public domain. # Filename: INPUT_OUTPUT_CHANNEL_BIT_DESCRIPTIONS.agc # Purpose: Part of the source code for Luminary 1A build 099. # It is part of the source code for the Lunar Module's (LM) # Apollo Guidance Computer (AGC), for Apollo 11. # Assembler: yaYUL # Contact: Onno Hommes . # Website: www.ibiblio.org/apollo. # Pages: 0054-0060 # Mod history: 2009-05-14 OH Transcribed from page images. # # This source code has been transcribed or otherwise adapted from # digitized images of a hardcopy from the MIT Museum. The digitization # was performed by Paul Fjeld, and arranged for by Deborah Douglas of # the Museum. Many thanks to both. The images (with suitable reduction # in storage size and consequent reduction in image quality as well) are # available online at www.ibiblio.org/apollo. If for some reason you # find that the images are illegible, contact me at info@sandroid.org # about getting access to the (much) higher-quality images which Paul # actually created. # # Notations on the hardcopy document read, in part: # # Assemble revision 001 of AGC program LMY99 by NASA 2021112-061 # 16:27 JULY 14, 1969 # Page 54 # *** CHANNEL DESCRIPTIONSF WORDS ARE ALLOCATED IN ERASABLE ASSIGNMENTS *** # CHANNEL 1 IDENTICAL TO COMPUTER REGISTER L (0001) # CHANNEL 2 IDENTICAL TO COMPUTER REGISTER Q (0002) # CHANNEL 3 HISCALAR; INPUT CHANNEL; MOST SIGNIFICANT 14 BITS FROM 33 STAGE BINARY COUNTER. SCALE # FACTOR IS B23 IN CSEC, SO MAX VALUE ABOUT 23.3 HOURS AND LEAST SIGNIFICANT BIT 5.12 SECS. # CHANNEL 4 LOSCALAR; INPUT CHANNEL; NEXT MOST SIGNIFICANT 14 BITS FROM THE 33 STAGE BINARY COUNTER # ASSOCIATED WITH CHANNEL 3. SCALE FACTOR IS B9 IN CSEC. SO MAX VAL IS 5.12 SEC AND LEAST # SIGNIFICANT BIT IS 1/3200 SEC. SCALE FACTOR OF D.P. WORD WITH CHANNEL 3 IS B23 CSEC. # CHANNEL 5 PYJETS; OUTPUT CHANNEL; PITCH RCS JET CONTROL. (REACTION CONTROL SYSTEM) USES BITS 1-8. # CHANNEL 6 ROLLJETS; OUTPUT CHANNEL; ROLL RCS JET CONTROL. (REACTION CONTROL SYSTEM) USES BIT 1-8. # CHANNEL 7 SUPERBNK; OUTPUT CHANNEL; NOT RESET BY RESTART; FIXED EXTENSION BITS USED TO SELECT THE # APPROPRIATE FIXED MEMORY BANK IF FBANK IS 30 OCTAL OR MORE. USES BITS 5-7. # CHANNEL 10 OUT0; OUTPUT CHANNEL; REGISTER USED TO TRANSMIT LATCHING-RELAY DRIVING INFORMATION FOR # THE DISPLAY SYSTEM. BITS 15-12 ARE SET TO THE ROW NUMBER (1-14 OCTAL) OF THE RELAY TO BE # CHANGED AND BITS 11-1 CONTAIN THE REQUIRED SETTINGS FOR THE RELAYS IN THE ROW. # CHANNEL 11 DSALMOUT; OUTPUT CHANNEL; REGISTER WHOSE BITS ARE USED FOR ENGINE ON-OFF CONTROL AND TO # DRIVE INDIVIDUAL INDICATORS OF THE DISPLAY SYSTEM. BITS 1-7 ARE A RELAYS. # # BIT 1 ISS WARNING # BIT 2 LIGHT COMPUTER ACTIVITY LAMP # BIT 3 LIGHT UPLINK ACTIVITY LAMP # BIT 4 LIGHT TEMP CAUTION LAMP # BIT 5 LIGHT KEYBOARD RELEASE LAMP # BIT 6 FLASH VERB AND NOUN LAMPS # BIT 7 LIGHT OPERATOR ERROR LAMP # Page 55 # BIT 8 SPARE # BIT 9 TEST CONNECTOR OUTBIT # BIT 10 CAUTION RESET # BIT 11 SPARE # BIT 12 SPARE # BIT 13 ENGINE ON # BIT 14 ENGINE OFF # BIT 15 SPARE # CHANNEL 12 CHAN12; OUTPUT CHANNEL; BITS USED TO DRIVE NAVIGATION AND SPAECRAFT HARDWARE # # BIT 1 ZERO RR CDU; CDU'S GIVE RRADAR INFORMATION FOR LM # BIT 2 ENABLE CDU RADAR ERROR COUNTERS # BIT 3 NOT USED # BIT 4 COARSE ALIGN ENABLE OF IMU # BIT 5 ZERO IMU CDU'S # BIT 6 ENABLE IMU ERROR COUNTER, CDU ERROR COUNTER. # BIT 7 SPARE # BIT 8 DISPLAY INERTIAL DATA # BIT 9 -PITCH GIMBAL TRIM (BELL MOTION) DESCENT ENGINE # BIT 10 +PITCH GIMBAL TRIM (BELL MOTION) DESCENT ENGINE # BIT 11 -ROLL GIMBAL TRIM (BELL MOTION) DESCENT ENGINE # BIT 12 +ROLL GIMBAL TRIM (BELL MOTION) DESCENT ENGINE # BIT 13 LR POSITION 2 COMMAND # BIT 14 ENABLE RENDESVOUS RADAR LOCK-ON;AUTO ANGLE TRACK'G # BIT 15 ISS TURN ON DELAY COMPLETE # Page 56 # CHANNEL 13 CHAN13; OUTPUT CHANNEL. # # BIT 1 RADAR C PROPER SETTING OF THE A,B,C MATRIX # BIT 2 RADAR B SELECTS CERTAIN RADAR # BIT 3 RADAR A PARAMETERS TO BE READ. # BIT 4 RADAR ACTIVITY # BIT 5 NOT USED (CONNECTS AN ALTERNATE INPUT TO UPLINK) # BIT 6 BLOCK INPUTS TO UPLINK CELL # BIT 7 DOWNLINK TELEMETRY WORD ORDER CODE BIT # BIT 8 RHC COUNTER ENABLE (READ HAND CONTROLLER ANGLES) # BIT 9 START RHC READ INTO COUNTERS IF BIT 8 SET # BIT 10 TEST ALARMS, TEST DSKY LIGHTS # BIT 11 ENABLE STANDBY # BIT 12 RESET TRAP 31-A ALWAYS APPEAR TO BE SET TO 0 # BIT 13 RESET TRAP 31-B ALWAYS APPEAR TO BE SET TO 0 # BIT 14 RESET TRAP 32 ALWAYS APPEAR TO BE SET TO 0 # BIT 15 ENABLE T6 RUPT # CHANNEL 14 CHAN14; OUTPUT CHANNEL; USED TO CONTROL COMPUTER COUNTER CELLS (CDU,GYRO,SPACECRAFT FUNC. # # BIT 1 OUTLINK ACTIVITY (NOT USED) # BIT 2 ALTITUDE RATE OR ALTITIDE SELECTOR # BIT 3 ALTITUDE METER ACTIVITY # BIT 4 THRUST DRIVE ACTIVITY FOR DESCENT ENGINE # BIT 5 SPARE # BIT 6 GYRO ENABLE POWER FOR PULSES # BIT 7 GYRO SELECT B PAIR OF BITS IDENTIFIES AXIS OF - # BIT 8 GYRO SELECT A GYRO SYSTEM TO BE TORQUED. # BIT 9 GYRO TORQUING COMMAND IN NEGATIVE DIRECTION # Page 57 # BIT 10 GYRO ACTIVITY # BIT 11 DRIVE CDU S # BIT 12 DRIVE CDU T # BIT 13 DRIVE CDU Z # BIT 14 DRIVE CDU Y # BIT 15 DRIVE CDU X # CHANNEL 15 MNKEYIN; INPUT CHANNEL;KEY CODE INPUT FROM KEYBOARD OF DSKY, SENSED BY PROGRAM WHEN # PROGRAM INTERRUPT #5 IS RECEIVED. USES BITS 5-1 # CHANNEL 16 NAVKEYIN; INPUT CHANNEL; OPTICS MARK INFORMATION AND NAVIGA ION PANEL DSKY (CM) OR THRUST # CONTROL (LM) SENSED BY PROGRAM WHEN PROGRAM INTER-RUPT #6 IS RECEIVED. USES BITS 3-7 ONLY. # # BIT 1 NOT ASSIGNED # BIT 2 NOT ASSIGNED # BIT 3 OPTICS X-AXIS MARK SIGNAL FOR ALIGN OPTICAL TSCOPE # BIT 4 OPTICS Y-AXIS MARK SIGNAL FOR AOT # BIT 5 OPTICS MARK REJECT SIGNAL # BIT 6 DESCENT+ ; CREW DESIRED SLOWING RATE OF DESCENT # BIT 7 DESCENT- ; CREW DESIRED SPEEDING UP RATE OF D'CENT # NOTE: ALL BITS IN CHANNELS 30-33 ARE INVERTED AS SENSED BY THE PROGRAM, SO THAT A VALUE OF ZERO MEANS # THAT THE INDICATED SIGNAL IS PRESENT. # CHANNEL 30 INPUT CHANNEL # # BIT 1 ABORT WITH DESCENT STAGE # BIT 2 UNUSED # BIT 3 ENGINE ARMED SIGNAL # BIT 4 ABORT WITH ASCENT ENGINE STAGE # BIT 5 AUTO THROTTLE; COMPUTER CONTROL OF DESCENT ENGINE # Page 58 # BIT 6 DISPLAY INERTIAL DATA # BIT 7 RR CDU FAIL # BIT 8 SPARE # BIT 9 IMU OPERATE WITH NO MALFUNCTION # BIT 10 LM COMPUTER (NOT AGS) HAS CONTROL OF LM # BIT 11 IMU CAGE COMMAND TO DRIVE IMU GIMBAL ANGLES TO 0. # BIT 12 IMU CDU FAIL (MALFUNCTION OF IMU CDU,S) # BIT 13 IMU FAIL (MALFUNCTION OF IMU STABILIZATION LOOPS) # BIT 14 ISS TURN ON REQUESTED # BIT 15 TEMPERATURE OF STABLE MEMBER WITHIN DESIGN LIMITS # CHANNEL 31 INPUT CHANNEL; BITS ASSOCIATED WITH THE ATTITUDE CONTROLLER, TRANSLATIONAL CONTROLLER, # AND SPACECRAFT ATTITUDE CONTROL; USED BY RCS DAP # # BIT 1 ROTATION (BY RHC) COMMANDED IN POSITIVE PITCH DIRECTION; MUST BE IN MINIMUM IMPULSE MODE. # ALSO POSITIVE ELEVATION CHANGE FOR LANDING POINT DESIGNATOR # BIT 2 AS BIT 1 EXCEPT NEGATIVE PITCH AND ELEVATION # BIT 3 ROTATION (BY RHC) COMMANDED IN POSITIVE YAW DIRECTION; MUST BE IN MINIMUM IMPULSE MODE. # BIT 4 AS BIT 3 EXCEPT NEGATIVE YAW # BIT 5 ROTATION (BY RHC) COMMANDED IN POSITIVE ROLL DIRECTION; MUST BE IN MINIMUM IMPULSE MODE. # ALSO POSITIVE AZIMUTH CHANGE FOR LANDING POINT DESIGNATOR # BIT 6 AS BIT 5 EXCEPT NEGATIVE ROLL AND AZIMUTH # BIT 7 TRANSLATION IN +X DIRECTION COMMANDED BY THC # BIT 8 TRANSLATION IN -X DIRECTION COMMANDED BY THC # BIT 9 TRANSLATION IN +Y DIRECTION COMMANDED BY THC # BIT 10 TRANSLATION IN -Y DIRECTION COMMANDED BY THC # BIT 11 TRANSLATION IN +Z DIRECTION COMMANDED BY THC # BIT 12 TRANSLATION IN -Z DIRECTION COMMANDED BY THC # Page 59 # BIT 13 ATTITUDE HOLD MODE ON SCS MODE CONTROL SWITCH # BIT 14 AUTO STABILIZATION OF ATTITUDE ON SCS MODE SWITCH # BIT 15 ATTITUDE CONTROL OUT OF DETENT (RHC NOT IN NEUTRAL # CHANNEL 32 INPUT CHANNEL. # # BIT 1 THRUSTERS 2 & 4 DISABLED BY CREW # BIT 2 THRUSTERS 5 & 8 DISABLED BY CREW # BIT 3 THRUSTERS 1 & 3 DISABLED BY CREW # BIT 4 THRUSTERS 6 & 7 DISABLED BY CREW # BIT 5 THRUSTERS 14 & 16 DISABLED BY CREW # BIT 6 THRUSTERS 13 & 15 DISABLED BY CREW # BIT 7 THRUSTERS 9 & 12 DISABLED BY CREW # BIT 8 THRUSTERS 10 & 11 DISABLED BY CREW # BIT 9 DESCENT ENGINE GIMBALS DISABLED BY CREW # BIT 10 APPARENT DESCENT ENGINE GIMBAL FAILURE # BIT 14 INDICATES PROCEED KEY IS DEPRESSED # CHANNEL 33 CHAN33; INPUT CHANNEL; FOR HARDWARE STATUS AND COMMAND INFORMATION. BITS 15-11 ARE FLIP- # FLOP BITS RESET BY A CHANNEL "WRITE" COMMAND THAT ARE RESET BY A RESTART & BY T4RUPT LOOP. # # BIT 1 SPARE # BIT 2 RR AUTO-POWER ON # BIT 3 RR RANGE LOW SCALE # BIT 4 RR DATA GOOD # BIT 5 LR RANGE DATA GOOD # BIT 6 LR POS1 # BIT 7 LR POS2 # Page 60 # BIT 8 LR VEL DATA GOOD # BIT 9 LR RANGE LOW SCALE # BIT 10 BLOCK UPLINK INPUT # BIT 11 UPLINK TOO FAST # BIT 12 DOWNLINK TOO FAST # BIT 13 PIPA FAIL # BIT 14 WARNING OF REPEATED ALARMS: RESTART,COUNTER FAIL, VOLTAGE FAIL,AND SCALAR DOUBLE. # BIT 15 LGC OSCILLATOR STOPPED # CHANNEL 34 DNT M1; OUTPUT CHANNEL; DOWNLINK 1 FIRST OF TWO WORDS SERIALIZATION. # CHANNEL 35 DNT M2; OUTPUT CHANNEL DOWNLINK 2 SOCOND OF TWO WORDS SERIALIZATION.