# 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 <ohommes@cmu.edu>.
# 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 DESCRIPTION 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 SPACECRAFT 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 RENDEZVOUS 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 IS 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 ALTITUDE 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.  USED BITS 5-1

# CHANNEL 16	NAVKEYIN: INPUT CHANNEL; OPTICS MARK INFORMATION AND NAVIGATION PANEL DSKY (CM) OR THRUST
#		CONTROL (LM) SENSED BY PROGRAM THEN PROGRAM INTERRUPT #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 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: SECOND OF TWO WORDS SERIALIZATION.


