Apollo-11/Luminary099/T6-RUPT_PROGRAMS.agc

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2016-07-07 08:47:26 +00:00
# Copyright: Public domain.
# Filename: T6-RUPT_PROGRAMS.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: Ron Burkey <info@sandroid.org>.
# Website: www.ibiblio.org/apollo.
# Pages: 1403-1405
# Mod history: 2009-05-10 SN (Sergio Navarro). Started adapting
# from the Luminary131/ file of the same
# name, using Luminary099 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
2016-12-28 16:11:25 +00:00
# 16:27 JULY 14, 1969
2016-07-07 08:47:26 +00:00
# Page 1403
# PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
# (2) DOT6RUPT
# MODIFICATION BY: LOWELL G. HULL (A.C.ELECTRONICS)
#
# THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
# SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
# ESTABLISHED AND MUST NOT BE TAMPERED WITH:
# 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
# 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
# 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
# A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
# B. THE TIME6 CLOCK IS ENABLED.
# C. TIME6 IS INTERROGATED AND IS:
# I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
# II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
# III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
# IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
# A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
# B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
# C. A T6RUPT IS IN PROCESS NOW.
# 4. ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
# EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
# (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
#
# T6JOBCHK CALLING SEQUENCE:
# L TC T6JOBCHK
# L+1 (RETURN)
#
# DOT6RUPT CALLING SEQUENCE:
# DXCH ARUPT # T6RUPT LEAD IN AT LOCATION 4004.
# EXTEND
# DCA T6ADR
# DTCB
#
# SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
#
# NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
# DOT6RUPT TRANSFERS CONTROL TO RESUME.
#
# ALARM/ABORT MODES: NONE.
#
# INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
# T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
# T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
#
# DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
BLOCK 02
# Page 1404
BANK 17
SETLOC DAPS2
BANK
EBANK= T6NEXT
COUNT* $$/DAPT6
T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
TC Q # NONE: CLOCK COUNTING DOWN.
TC CCSHOLE
TC T6JOBCHK +3
# CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E., WHEN A T6RUPT MUST BE PROCESSED).
T6JOB CAF POSMAX # DISABLE CLOCK: NEEDED SINCE RUPT OCCURS
EXTEND # 1 DINC AFTER T6 = 77777. FOR 625 MUSECS
WAND CHAN13 # MUST NOT HAVE T6 = +0 WITH ENABLE SET
CA POSMAX
ZL
DXCH T6FURTHA
DXCH T6NEXT
LXCH NXT6ADR
TS TIME6
AD PRIO37
TS A
TCF ENABLET6
CA POSMAX
TS TIME6
TCF GOCH56
ENABLET6 CA BIT15
EXTEND
WOR CHAN13
CA T6NEXT
AD PRIO37
TS A
TCF GOCH56
CA POSMAX
TS T6NEXT
GOCH56 INDEX L
TCF WRITEP -1
BLOCK 02
SETLOC FFTAG9
BANK
EBANK= CDUXD
COUNT* $$/DAPT6
CA NEXTP
WRITEP EXTEND
WRITE CHAN6
# Page 1405
TC Q
CA NEXTU
WRITEU TS L
CS 00314OCT
EXTEND
RAND CHAN5
AD L
EXTEND
WRITE CHAN5
TC Q
CA NEXTV
WRITEV TS L
CA 00314OCT
TCF -9D
00314OCT OCT 00314
BANK 17
SETLOC DAPS2
BANK
EBANK= T6NEXT
COUNT* $$/DAPT6
DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
EXTEND
QXCH QRUPT
TC T6JOBCHK # CALL T6JOBCHK.
TCF RESUME # END TIME6 INTERRUPT PROCESSOR.