P30,P37.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: P30_P37.agc
## Purpose: A section of Luminary 1C, revision 131.
## It is part of the source code for the Lunar Module's (LM)
## Apollo Guidance Computer (AGC) for Apollo 13.
## This file is intended to be a faithful transcription, except
## that the code format has been changed to conform to the
## requirements of the yaYUL assembler rather than the
## original YUL assembler.
## Reference: pp. 619-622
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo
## Mod history: 05/19/03 RSB. Began transcribing.
## 2017-01-06 RSB Page numbers now agree with those on the
## original harcopy, as opposed to the PDF page
## numbers in 1701.pdf.
## 2017-02-24 RSB Proofed comment text using octopus/ProoferComments.
## 2017-03-09 RSB Fixed VNP00H to VNPOOH.
## 2017-03-14 RSB Comment-text fixes noted in proofing Luminary 116.
## Page 619
# PROGRAM DESCRIPTION P30 DATE 3-6-67
# MOD.1 BY RAMA AIYAWAR
#
# FUNCTIONAL DESCRIPTION
# ACCEPT ASTRONAUT INPUTS OF TIG,DELV(LV)
# CALL IMU STATUS CHECK ROUTINE (R02)
# DISPLAY TIME TO GO, APOGEE, PERIGEE, DELV(MAG), MGA AT IGN
# REQUEST BURN PROGRAM
#
# CALLING SEQUENCE VIA JOB FROM V37
#
# EXIT VIA V37 CALL OR TO GOTOPOOH (V34E)
#
# SUBROUTINE CALLS - FLAGUP, PHASCHNG, BANKCALL, ENDOFJOB, GOFLASH, GOFLASHR
# GOPERF3R, INTPRET, BLANKET, GOTOPOOH, R02BOTH, S30.1,
# TTG/N35, MIDGIM, DISPMGA
#
# ERASABLE INITIALIZATION - STATE VECTOR
#
# OUTPUT - RINIT, VINIT, +MGA, VTIG, RTIG, DELVSIN, DELVSAB, DELVSLV, HAPO,
# HPER, TTOGO
#
# DEBRIS - A, L, MPAC, PUSHLIST
BANK 32
SETLOC P30S
BANK
EBANK= +MGA
COUNT* $$/P30
P30 TC UPFLAG # SET UPDATE FLAG
ADRES UPDATFLG
TC UPFLAG # SET TRACK FLAG
ADRES TRACKFLG
P30N33 CAF V06N33 # T OF IGN
TC VNPOOH # RETURNS ON PROCEED, POOH ON TERMINATE
CAF V06N81 # DISPLAY DELTA V (LV)
TC VNPOOH # REDISPLAY ON RECYCLE
TC DOWNFLAG # RESET UPDATE FLAG
ADRES UPDATFLG
TC INTPRET
CALL
S30.1
SET SET
UPDATFLG
XDELVFLG
EXIT
PARAM30 CAF V06N42 # DISPLAY APOGEE,PERIGEE,DELTA V
## Page 620
TC VNPOOH
TC INTPRET
SET
FINALFLG
REVN1645 CALL
VN1645
GOTO # COMES HERE ON RECYCLE RESPONSE
REVN1645
V06N33 VN 0633
V06N42 VN 0642
## Page 621
# PROGRAM DESCRIPTION S30.1 DATE 9NOV66
# MOD NO 1 LOG SECTION P30,P37
# MOD BY RAMA AIYAWAR **
#
# FUNCTIONAL DESCRIPTION
# BASED ON STORED TARGET PARAMETERS (R OF IGNITION (RTIG), V OF
# IGNITION (VTIG), TIME OF IGNITION (TIG)), COMPUTE PERIGEE ALTITUDE
# APOGEE ALTITUDE AND DELTAV REQUIRED (DELVSIN).
#
# CALLING SEQUENCE
# L CALL
# L+1 S30.1
#
# NORMAL EXIT MODE
# AT L+2 OR CALLING SEQUENCE (GOTO L+2)
#
# SUBROUTINES CALLED
# LEMPREC
# PERIAPO
#
# ALARM OR ABORT EXIT MODES
# NONE
#
# ERASABLE INITIALIZATION REQUIRED
# TIG TIME OF IGNITION DP B28CS
# DELVSLV SPECIFIED DELTA-V INLOCAL VERT.
# COORDS. OF ACTIVE VEHICLE AT
# TIME OF IGNITION VECTOR B+7 METERS/CS
#
# OUTPUT
# RTIG POSITION AT TIG VECTOR B+29 METERS
# VTIG VELOCITY AT TIG VECTOR B+29 METERS/CS
# PDL 4D APOGEE ALTITUDE DP B+29 M, B+27 METERS.
# HAPO APOGEE ALTITUDE DP B+29 METERS
# PDL 8D PERIGEE ALTITUDE DP B+29 M, B+27 METERS.
# HPER PERIGEE ALTITUDE DP B+29 METERS
# DELVSIN SPECIFIED DELTA-V IN INERTIAL
# COORD. OF ACTIVE VEHICLE AT
# TIME OF IGNITION VECTOR B+7 METERS/CS
# DELVSAB MAG. OF DELVSIN VECTOR B+7 METERS/CS
#
# DEBRIS QTEMP TEMP.ERASABLE
# QPRET, MPAC
# PUSHLIST
SETLOC P30S1
BANK
COUNT* $$/S30S
S30.1 STQ DLOAD
QTEMP
TIG # TIME IGNITION SCALED AT 2(+28)CS
STCALL TDEC1
LEMPREC # ENCKE ROUTINE FOR LEM
VLOAD SXA,2
## Page 622
RATT
RTX2
STORE RTIG # RADIUS VECTOR AT IGNITION TIME
UNIT VCOMP
STOVL DELVSIN # ZRF/LV IN DELVSIN SCALED AT 2
VATT # VELOCITY VECTOR AT TIG, SCALED 2(7) M/CS
STORE VTIG
VXV UNIT
RTIG
SETPD SXA,1
0
RTX1
PUSH VXV # YRF/LV PDL 0 SCALED AT 2
DELVSIN
VSL1 PDVL
PDVL PDVL # YRF/LV PDL 6 SCALED AT 2
DELVSIN # ZRF/LV PDL 12D SCALED AT 2
DELVSLV
VXM VSL1
0
STORE DELVSIN # DELTAV IN INERT. COOR. SCALED TO B+7M/CS
ABVAL
STOVL DELVSAB # DELTA V MAG.
RTIG # (FOR PERIAPO)
PDVL VAD # VREQUIRED = VTIG + DELVSIN (FOR PERIAPO)
VTIG
DELVSIN
CALL
PERIAPO1
CALL
SHIFTR1 # RESCALE IF NEEDED
CALL # LIMIT DISPLAY TO 9999.9 N. MI.
MAXCHK
STODL HPER # PERIGEE ALT 2(29) METERS, FOR DISPLAY
4D
CALL
SHIFTR1 # RESCALE IF NEEDED
CALL # LIMIT DISPLAY TO 9999.9 N. MI.
MAXCHK
STCALL HAPO # APOGEE ALT 2(29) METERS, FOR DISPLAY
QTEMP