swh:1:snp:92f3f585b9ae79620ad8c41a332d6329b31fd381
Tip revision: 078c79d8734a9ed2860303a7c1662004284fe853 authored by Ron Burkey on 07 August 2022, 15:04:04 UTC
Fixed a potential string-overflow bug in yaASM. Removed timestamps from
Fixed a potential string-overflow bug in yaASM. Removed timestamps from
Tip revision: 078c79d
MISSION_PHASE_2_GUIDANCE_REFERENCE_RELEASE_PLUS_BOOST_MONITOR.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: MISSION_PHASE_2_GUIDANCE_REFERENCE_RELEASE_PLUS_BOOST_MONITOR.agc
## Purpose: A module for revision 0 of BURST120 (Sunburst). It
## is part of the source code for the Lunar Module's
## (LM) Apollo Guidance Computer (AGC) for Apollo 5.
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo/index.html
## Mod history: 2016-09-30 RSB Created draft version.
## 2016-10-23 MAS Transcribed.
## 2016-10-32 RSB Typos.
## 2016-12-06 RSB Comments proofed using octopus/ProoferComments,
## changes made.
## 2017-06-13 RSB Fixes identified whilst transcribing SUNBURST 37.
## Page 673
# PROGRAM NAME - MISSION PHASE 2 GUIDANCE REFERENCE RELEASE + BOOST MONITOR.
# MODIFICATION NUMBER - 1 DATE - NOVEMBER 22, 1966 MODIFICATION BY - COVELLI
# FUNCTIONAL DESCRIPTION -
# THE FUNCTION OF MISSION PHASE 2 IS TO CONTROL THE SEQUENCE OF EVENTS IN THE 206 FLIGHT FROM GUIDANCE
# REFERENCE RELEASE THROUGH LIFTOFF TO THE SIVB BOOSTER SHUTDOWN.
# AT GUIDANCE REFERENCE RELEASE, THE GRR FLAG IS SET, PREREAD IS CALLED TO BEGIN COMPUTATION OF POSITION AND
# VELOCITY, AND CALLS ARE MADE FOR DFI T/M CALIBRATION AND LIFTOFF
# WHEN PRELAUNCH DETECTS THAT THE GRR FLAG IS SET, IT TERMINATES GYROCOMPASSING AND CALLS MP2JOB. MP2JOB
# DISPLAYS 7 IN THE MAJOR MODE AND GOES TO MATRXJOB TO COMPUTE REFSMMAT.
# AT LIFTOFF, THE LGC CLOCK IS ZEROED, CALLS ARE MADE FOR THE COLD FIRE PURGE AND POST LET JETTISON PROGRAMS.
# THE MAJOR MODE IS CHANGED TO 11.
# AT POST LET JETTISON, THE DV MONITOR IS ENABLED TO DETECT BOOSTER SHUTDOWN, THE ABORT COMMAND MONITOR AND THE
# TUMBLE MONITOR ARE ENABLED, AND THE MAJOR MODE IS CHANGED TO 12.
# THE VARIOUS LMP COMMANDS REQUIRED FOR MP2 ARE SCHEDULED BY WAITLIST CALLS.
# AT DETECTION OF SIVB SHUTDOWN, AN EXECUTIVE CALL IS MADE TO MISSION PHASE 6.
# CALLING SEQUENCE :
# MISSION PHASE 2 IS BEGUN UPON RECEIPT OF THE GUIDANCE REFERENCE RELEASE SIGNAL (VERB 65 ENTER) VIA UPLINK.
# SUBROUTINES CALLED :
# PREREAD 1LMP
# TUMTASK 2LMP
# NEWMODEX PHASCHNG
# FINDVAC NEWPHASE
# NOVAC DFITMCAL
# SPVAC IBNKCALL
# WAITLIST
# LONGCALL
# NORMAL EXIT MODES :
## Page 674
# EXIT TO MISSION PHASE 6 AT SIVB SHUTDOWN.
# ABORT EXIT MODES :
# TO MISSION PHASE 3 IF SUBORBITAL ABORT COMMAND RECEIVED VIA UPLINK.
# TO MISSION PHASE 4 IF CONTINGENCY ORBIT INSERTION COMMAND RECEIVED VIA UPLINK.
# TO CHARALRM IF EITHER OF THE ABOVE ABORT COMMANDS RECEIVED WHILE ABORT COMMAND MONITOR NOT ENABLED.
# OUTPUT :
# TGRR TIME OF GUIDANCE REFERENCE RELEASE
# TPRELTER TIME OF GYROCOMPASSING TERMINATION
# TLIFTOFF TIME OF LIFTOFF AND LGC CLOCK ZEROING
# GRR FLAG BIT2 FLAGWRD1 SET TO INDICATE GRR SIGNAL RECEIVED
# SERVICER IS GOING AT END OF MISSION PHASE 2
# MAJOR MODE DISPLAYS
# ERASABLE INITIALIZATION :
# DT-LIFT DELTA TIME FROM GRR TO LIFTOFF, SINGLE PRECISION SCALED AT 2(+14) CS.
# DT-LETJT DELTA TIME FROM LIFTOFF TO POST LET JETTISON, DOUBLE PRECISION SCALED AT 2(+28) CS.
# RAVEGON POSITION AT GRR IN SM CO-ORDINATES, VECTOR SCALED AT 2(+24) M.
# VAVEGON VELOCITY AT GRR IN SM CO-ORDINATES, VECTOR SCALED AT 2(+7) M/CS.
# ******** ALL OF THE ERASABLE INITIALIZATION MUST BE DONE DURING THE PRE-LAUNCH ERASABLE LOAD *****************
# DEBRIS :
# CENTRALS AND EXECUTIVE WORK AREA.
BANK 27
EBANK= TGRR
GRRPLACE TC FLAG1UP
OCT 2
TC ENDOFJOB
MP2TASK CA PRIO15
TC FINDVAC
## Page 675
EBANK= TGRR
2CADR MP2JOB
CA DT-LIFT
TC WAITLIST # SET UP CALL TO LIFTOFF PROGRAM
EBANK= TGRR
2CADR LIFTOFF
TC 2PHSCHNG
OCT 00375 # 5.37 SPOT FOR MP2TASK.
OCT 00273 # 3.27 SPOT TO FINISH PRELAUNCH.
TC 2PHSCHNG
OCT 40132 # 2.13 SPOT FOR LIFTOFF.
OCT 00074 # 4.7 SPOT FOR MP2JOB.
CAF BIT2
TC SETRSTRT # SET RESTART FLAG
SETPIPDT CAF PRIO31 # TWO SECONDS SCALED AT (CS) X 2(+8)
TS 1/PIPADT
CA AVEGADRS
TS DVSELECT
EXTEND
DCA SVEXADRS
DXCH AVGEXIT
EXTEND
DCA SVEXADRS
DXCH DVMNEXIT
CA EBANK5
TS EBANK
CA EBANK4
TS Q
EBANK= TEMPTIME
EXTEND # GET TEMPTIME
DCA TEMPTIME
DXCH TPRELTER
EXTEND
DCA TPRELTER
EXTEND
QXCH EBANK
EBANK= TAVEGON
DXCH TAVEGON # STORE IN TAVEGON
EBANK= TGRR
## Page 676
EXTEND
DCA BBBBBBBB
DTCB
EBANK= DVCNTR
BBBBBBBB 2CADR BIBIBIAS
MP2JOB TC INTPRET
SSP DLOAD
PHASENUM
2
TPRELTER
STORE TGRR
STORE TEVENT # FOR DOWNLINK.
## Page 677
# PROGRAM DESCRIPTION- MATRXJOB DATE: 18 JAN 1967
# MOD NO: 2 LOG SECTION- MP 2 GRR + BOOST MONITOR
# MOD BY: MILLER, LICKLY, KERNAN ASSEMBLY: SUNBURST REVISION 79
# FUNCTIONAL DESCRIPTION
# THIS PROGRAM CONSTRUCTS THE MATRIX WHICH RELATES THE STABLE MEMBER INERTIAL FRAME TO THE REFERENCE
# FRAME (Z NORTH, X ALONG THE VERNAL EQUINOX.)
# TWO INTERMEDIATE COORDINATE SYSTEMS ARE USED: A LOCAL, EARTH FIXED, VERTICAL, SOUTH, EAST SYSTEM AND AN
# EARTH REFERENCE X, Y, Z SYSTEM. IN THIS LATTER SYSTEM, THE Z AXIS IS THE EARTH'S ROTATION AXIS, THE X AXIS IS
# NORMAL TO Z IN THE PLANE OF Z AND THE LOCAL VERTICAL, POSITIVE IN THE DIRECTION OF V. Y IS Z CROSS X.
# THE FIRST COMPUTATION IS OF AZGR, THE ANGLE BETWEEN THE REFERENCE INERTIAL AND EARTH REFERENCE X-Z
# PLANES (THE Z AXES ARE COINCIDENT). AZGR IS COMPUTED BY CONVERTING THE TIME FROM THE BEGINNING OF THE EPHEMERIS
# YEAR TO RELEASE (TEPHEM + TPRELTER) TO REVOLUTIONS (DAYS). THE WHOLE REVS ARE DISCARDED AND THE INITIAL ANGLE
# (AZ0) BETWEEN THE GREENWICH MERIDIAN AND THE REFERENCE X-Z PLANES IS ADDED. ADDING THE LONGITUDE YIELDS AZGR.
# THE FOLLOWING COMPUTATIONS ARE THEN PERFORMED.
# LOCAL VERTICAL(ER) = COS(LATITUDE), 0, SIN(LATITUDE) IN EARTH REFERENCE
# LOCAL VERTICAL(IR) = COS(LAT)COS(AZGR), COS(LAT)SIN(AZGR), SIN(LAT) IN INERTIAL REFERENCE
# LOCAL EAST(IR) = UNIT(NXV) = -SIN(AZGR), COS(AZGR), 0 IN INERTIAL REFERENCE
# LOCAL SOUTH(IR) = E(IR) X V(IR)
## In the following line, the printout reads "... V. S, F AXES ..."; however,
## the corresponding line in SUNBURST 37 is "... V, S, E AXES ...", which is
## clearly correct in terms of content. My assumption is that the SUNBURST 120
## printout is faulty and that SUNBURST 37 is correct. — RSB
# THE RELATIONSHIP OF THE STABLE MEMBER AXES TO THE V, S, E AXES IS GIVEN BY ZSMAZ, THE ANGLE FROM NORTH
# TO ZSM, AND TILT, THE ANGLE ABOUT ZSM FROM VERTICAL TO XSM.
# ZSM(IR) = EAST(IR)SIN(ZSMAZ) - SOUTH(IR)COS(ZSMAZ)
# YSM(IR) = (ZSM(IR) X V(IR))COS(TILT) - V(IR)SIN(TILT)
# XSM(IR) = YSM(IR) X ZSM(IR)
# THESE THREE HALF-UNIT VECTORS, XSM(IR), YSM(IR), AND ZSM(IR) ARE THE SM AXES EXPRESSED IN INERTIAL
# REFERENCE COORDINATES AND THEY FORM REFSMMAT, THE REFERENCE TO STABLE MEMBER MATRIX.
# THE INPUT (PRELAUNCH ERASABLE LOAD) REQUIREMENTS ARE:
# 1) TEPHEM THE TRIPLE PRECISION TIME IN CENTISECONDS FROM MIDNIGHT JULY 1, OF THE EPHEMERIS YEAR TO
# MIDNIGHT OF THE LAUNCH DAY (SIDEREAL CONVERTED TO MEAN SOLAR.)
# IT IS ASSUMED THAT DURING THE LAUNCH COUNTDOWN THE LGC CLOCK (TIME2, TIME1) WILL BE ALIGNED TO REFLECT A
# ZERO VALUE AT MIDNIGHT OF THE LAUNCH DAY. IF NOT, THE DIFFERENCE MUST BE ADDED TO TEPHEM.
# 2) TILT THE ROTATION OF XSM ABOUT ZSM (RIGHT HAND RULE) FROM VERTICAL IN REVOLUTIONS.
## Page 678
# 3) ZSMAZ THE ANGLE FROM NORTH TO ZSM IN REVOLUTIONS.
# THE OUTPUTS OF THIS PROGRAM ARE:
# 1) REFSMMAT THE HALF-UNIT MATRIX WHICH TRANSFORMS FROM REFERENCE INERTIAL TO SM INERTIAL.
# 2) AZGR THE ANGLE BETWEEN PAD 37 B VERTICAL AND THE REFERENCE X-Z PLANE IN REVOLUTIONS.
# CALLING SEQUENCE : CONTINUATION OF MP2JOB
# NORMAL EXIT MODE- TC ENDOFJOB
# ALARM OR ABORT EXITS- NONE
# DEBRIS- SPECIALS, CENTRALS AND EXECUTIVE WORK AREA.
MATRXJOB DLOAD SR
TPRELTER # MAKE ALIGN STOP TIME TP.
14D
TAD RTB
TEPHEM # TP CS FROM JULY 1 TO LAUNCH DAY.
TPMODE # SET STORE MODE TO TRIPLE.
STORE 20D # TP CS FROM JULY 1 TO RELEASE.
SLOAD NORM
20D
X1 # -9 OR -10.
DMP RTB
WEARTH # REVS PER 2(28)CS.
SGNAGREE
SR* PDDL
0 -19D,1 # GETS RID OF WHOLE REVS.
21D
DMP RTB
WEARTH
SGNAGREE
SLR DAD
5 # DP FRACTION OF A REV.
DAD DAD
AZ0 # MERIDIAN ANGLE AT JULY 1.
P37BLONG # PAD ANGLE TO MERIDIAN.
STORE AZGR # VERT. AZ. AT RELEASE WRT X-Z INERTIAL.
SIN
STODL REFSMMAT +6 # SIN(AZGR).
AZGR
COS
STODL MPAC +3 # Y OF EAST IN INERTIAL = COS(AZGR).
P37BLAT # LOCAL VERTICAL Z IN EARTH REF. SIN(L).
SIN
STODL REFSMMAT +4 # ALSO LOCAL VERT Z IN REF. INERTIAL.
P37BLAT
## Page 679
COS SL1 # SAVES 2 SL'S LATER.
STORE 20D # LOCAL VER. X IN EARTH REF. COS(L).
DMP
MPAC +3
STODL REFSMMAT # X OF VERT IN INERTIAL = COS(L)COS(AZGR).
REFSMMAT +6 # SIN(AZGR).
DMP
20D
STODL REFSMMAT +2 # Y OF VERT IN INERTIAL = COS(L)SIN(AZGR).
DPZRO
STODL MPAC +5 # Z OF EAST IN INERTIAL = 0.
REFSMMAT +6 # SIN(AZGR).
DCOMP RTB # ALSO -X OF EAST IN INERTIAL.
VECMODE # SET STORE MODE TO VECTOR.
PUSH VXV # INERTIAL EAST INTO PD.
REFSMMAT
UNIT # INERTIAL SOUTH = UNIT(EXV).
STODL REFSMMAT +12D # INTO REF +12D (TEMP).
ZSMAZ # ZSM WRT NORTH.
COS VXSC
REFSMMAT +12D # SOUTH(IR)COS(ZSMAZ).
STODL REFSMMAT +12D # INTO REF +12D (TEMP).
ZSMAZ
SIN VXSC # EAST(IR)SIN(ZSMAZ).
VSU UNIT
REFSMMAT +12D # UNIT(ZSM) IN INERTIAL =
STORE REFSMMAT +12D # EAST(IR)SIN(ZSMAZ) - SOUTH(IR)COS(ZSMAZ)
VXV UNIT
REFSMMAT # YREFSM(UNTILTED)= Z CROSS VERT = Y1.
PDDL COS # INTO PD.
TILT # TILT IS POS ABOUT ZSM FROM UNTILTED YSM.
VXSC
PDDL SIN # (Y1)COS(T) INTO PD.
TILT
VXSC BVSU
REFSMMAT
UNIT
STORE REFSMMAT +6 # YREFSM = (Y1)COS(T) - (VERT)SIN(T).
VXV UNIT
REFSMMAT +12D
STORE REFSMMAT # XREFSM = Y CROSS Z.
EXIT
TC PHASCHNG
OCT 00004 # DEACTIVATE GROUP 4
TC ENDOFJOB
## Page 680
DFITMCAL TC 1LMP # MUST BE CALLED BY IBNKCALL (OR ISWCALL)
DEC 236 # IN INTERRUPT OR INHIBITED
CA 12SEC
TC WAITLIST # CALL DFITMCL1 IN 12 SECONDS
EBANK= TGRR
2CADR DFITMCL1
TCF ISWRETRN
DFITMCL1 TC 2LMP
DEC 237 # DFI T/M CALIBRATE OFF
DEC 198 # MASTER C+W ALARM RESET - COMMAND
TC FIXDELAY
DEC 200 # DELAY 2 SECONDS
DFITMCL2 TC 1LMP
DEC 199 # MASTER C+W ALARM RESET - COMMAND RESET
TCF TASKOVER
LIFTOFF TC NEWMODEX # DISPLAY MAJOR MODE 11
OCT 11
CA 61OCT
TC NEWPHASE # IMMEDIATE RESTART HERE
OCT 2
REDO2.61 ZL # THIS SECTION OF CODING ZEROES THE LGC
CS HALF # CLOCK AND MAKES THE CORRESPONDING
DOUBLE # CORRECTION TO TBASE5 , SO THAT READACCS
AD TIME1 # IS NOT CALLED TOO SOON. THE NEW TBASE5
ADS TBASE5 # IS OVERFLOW CORRECTED.
CA ZERO
DXCH TIME2
DXCH TLIFTOFF # SAVE TIME OF LIFTOFF
CA 63OCT
TC NEWPHASE # DO NOT REPEAT THE ABOVE
OCT 2
REDO2.63 EXTEND
DCA DT-LETJT
TC LONGCALL
EBANK= TGRR
2CADR POSTLET
TC 2PHSCHNG
OCT 00073 # RESTART POSTLET LONGCALL GROUP 3
OCT 25012 # AND CONTINUE LIFTOFF (SET LONGBASE HERE)
OCT 77777
## Page 681
TC 2PHSCHNG
OCT 2
OCT 47016 # PROTECT RCSPURGE.
DEC 10500
EBANK= TGRR
2CADR RCSPURGE
TC FIXDELAY
DEC 10500
RCSPURGE CA +XJETSON
EXTEND
WRITE 5 # TURN ON +X TRANSLATION
TCF TASKOVER
POSTLET CS FLAGWRD2 # ENABLE ABORT COMMAND MONITOR
MASK BIT9 # BIT 9 FLAGWORD 2
ADS FLAGWRD2
TC NEWMODEX
OCT 12 # MAJOR MODE 12
CA BIT1
TC WAITLIST # ENABLE TUMBLE MONITOR
EBANK= OMEGA
2CADR TUMTASK
TC 2PHSCHNG
OCT 00053 # RESTART TUMTASK GR 3
OCT 47012
DEC 1000
EBANK= TGRR
2CADR MONBOOST
TC FIXDELAY
DEC 1000 # WAIT 10 SECONDS FOR STAGING + SIVB IGN.
MONBOOST CA BOOSTADR # MONITOR DELV FOR BOOSTER SHUTDOWN
TS DVSELECT
TC PHASCHNG
OCT 47012
DEC 2100
EBANK= TGRR
2CADR PURGEOFF
TC FIXDELAY
DEC 2100 # WAIT 21 SECONDS
## Page 682
PURGEOFF CA ZERO
TC NEWPHASE
OCT 6
CA ZERO
EXTEND
WRITE 6
EXTEND
WRITE 5 # TURN OFF RCS JETS
TC 1LMP+DT
DEC 186 # ECS PRIMARY WATER VALVE OPEN
DEC 200 # WAIT 2 SECONDS
WATEROFF TC 1LMP
DEC 187 # ECS PRIMARY WATER VALVE - OPEN RESET
TC PHASCHNG
OCT 00002 # DEACTIVATE GROUP 2
TCF TASKOVER # END OF MISSION PHASE 2
# DELTA T S AND OTHER CONSTANTS FOR MP2
AVEGADRS GENADR AVERAGEG
BOOSTADR GENADR BOOSTMON
SVEXADRS EQUALS SVEXITAD
12SEC DEC 1200
WEARTH 2DEC 31.1539787 B-5 # REVOLUTIONS PER 2(28) CENTISECONDS.
+XJETSON OCT 00252 # BITS FOR +X TRANSLATION JETS
# ABORT COMMAND MONITOR - DETECTS
# SUBORBITAL ABORT AND CONTINGENCY
# ORBIT INSERTION
SUBABORT INHINT # SUBORBITAL ABORT - ZERO ABORTNDX TO
CAF ZERO # SET UP MISSION PHASE 3
TCF CONORBIT +2
CONORBIT INHINT # CONTINGENCY ORBIT INSERTION - ABORTNDX
CAF TWO # SET TO 2 TO SET UP MISSION PHASE 4
TS L # SAVE IN L
CS FLAGWRD2 # CHECK ABORT RECEIVED FLAG TO INSURE THAT
MASK BIT10 # MULTIBLE TRANSMISSIONS DON'T START
## Page 683
EXTEND # MULTIBLE JOBS. SINCE MULTIBLE XMISSIONS
BZF ENDOFJOB # ARE THE RULE, LEAVE WITH NO ALARM.
CS FLAGWRD2 # IS ABORT COMMAND MONITOR ENABLED
MASK BIT9
EXTEND
BZF SETABORT # YES.
TC ALARM # ABORT NOT ENABLED, SET ALARM AND EXIT.
OCT 00300
TC ENDOFJOB
SETABORT INHINT
CA EBANK3
TS EBANK
LXCH ABORTNDX # STORE ABORTNDX
CAF AVEGADRS
TS DVSELECT # TURN OFF BOOSTMON
TC 2PHSCHNG
OCT 00004
OCT 00006
TC 2PHSCHNG
OCT 00003
OCT 07022
OCT 21000
EBANK= ABORTNDX
2CADR TUMBL3/4
TC FLAG2UP
OCT 01000 # ABORT RECEIVED FLAG
TC POSTJUMP
CADR ENEMA # WIPE EVERYTHING OUT
TUMBL3/4 INHINT
CA BIT1
TC WAITLIST # RE-ESTABLISH TUMBLE MONITOR
EBANK= OMEGA
2CADR TUMTASK
TC 2PHSCHNG
OCT 00053 # 3.5 SPOT FOR TUMTASK
OCT 04022 # GR 2 FOR ABORT3/4
ABORT3/4 INHINT
CAF PRIO27
TS NEWPRIO # SET UP MP3 OR MP4 VIA SPVAC
EXTEND
## Page 684
INDEX ABORTNDX # GET RIGHT 2CADR
DCA MP3-4ADR
TC SPVAC # SET UP ABORT JOB.
TCF ENDOFJOB
EBANK= TDEC
MP3-4ADR 2CADR MP03JOB # DO NOT CHANGE THE ORDER OF THESE 2 CARDS
EBANK= TDEC
2CADR MP4JOB # THEY ARE IN AN INDEXED TABLE
EBANK= TDEC # LEFT-OVERS FROM DELETED MISSION PHASE 18
MIDAVEAD 2CADR MIDTOAVE
EBANK= TDEC
SVEXITAD 2CADR SERVEXIT
61OCT OCT 61
63OCT OCT 63
## Page 685
# SET UP & EXECUTE JOB TO ADD VELOCITY CORRECTION TO VN:
EBANK= GTSWTLST
LIFTFIXT CA PRIO17 # LESS THAN PRELAUNCH OR NORMLIZE
TC FINDVAC
EBANK= OLDGT
2CADR LIFTFIX
TC TASKOVER
LIFTFIX CS PIPTIME +1 # PRELAUNCH BY NOW HAS FOUND THE GRR FLAG
AD OLDGT # & SUBSEQUENTLY BEEN THRU PREREAD, VIA
EXTEND # MP2TASK.
BZMF +3
AD NEG1/2 # (IF TIME1 OVERFLOWED)
AD NEG1/2
TS MPAC +3
TC INTPRET
SLOAD DDV
MPAC +3
-1SEC214 # MAKE THE TIME-RATIO POSITIVE.
VXSC PDVL
GDT/2
DELV
VAD VSL1
DELVBUF
VXSC VAD
KPIP1
VAD
VN
STORE VN
EXIT
TC ENDOFJOB
-1SEC214 2DEC -100 B-14
