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P30_P37.agc
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# Copyright: Public domain.
# Filename: P30_P37.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: 614-617
# Mod history: 2009-05-17 RSB Adapted from the corresponding
# Luminary131 file, using page
# images from Luminary 1A.
# 2009-06-05 RSB Removed 4 lines of code that shouldn't
# have survived from Luminary 131.
#
# 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 614
# 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,
# TIG/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* $$/P30
P30 TC UPFLAG # SET UPDATE FLAG
ADRES UPDATFLG
TC UPFLAG # SET TRACK FLAG
ADRES TRACKFLG
P30N33 CAF V06N33 # T OF IGN
TC VNPOOH # RETURNS ON PROCEED, POOH ON TERMINATE
CAF V06N81 # DISPLAY DELTA V (LV)
TC VNPOOH # REDISPLAY ON RECYCLE
TC DOWNFLAG # RESET UPDATE FLAG
ADRES UPDATFLG
TC INTPRET
CALL
S30.1
SET EXIT
UPDATFLG
PARAM30 CAF V06N42 # DISPLAY APOGEE,PERIGEE ,DELTA V
TC VNPOOH
# Page 615
TC INTPRET
SETGO
XDELVFLG # FOR P40'S: EXTERNAL DELTA-V GUIDANCE.
REVN1645 # TRKMKCNT, T60, +MGA DISPLAY
V06N33 VN 0633
V06N42 VN 0642
# Page 616
# PROGRAM DESCRIPTION S30.1 DATE 9NOV66
# MOD NO 1 LOG SECTION P30,P37
# MOD BY RAMA AIYAWAR **
# FUNCTIONAL DESCRIPTION
# BASED ON STORED TARGET PARAMETERS(R OF IGNITION(RTIG),V OF
# IGNITION(VTIG),TIME OF IGNITION (TIG)),COMPUTE PERIGEE ALTITUDE
# APOGEE ALTITUDE AND DELTAV REQUIRED(DELVSIN).
# CALLING SEQUENCE
# L CALL
# L+1 s30.1
# NORMAL EXIT MODE
# AT L+2 OR CALLING SEQUENCE (GOTO L+2)
# SUBROUTINES CALLED
# LEMPREC
# PERIAPO
# ALARM OR ABORT EXIT MODES
# NONE
# ERASABLE INITIALIZATION REQUIRED
# TIG TIME OF IGNITION DP B28CS
# DELVSLV SPECIFIED DELTA-V IN LOCAL VERT.
# COORDS. OF ACTIVE VEHICLE AT
# TIME OF IGNITION VECTOR B+7 METERS/CS
#
# OUTPUT
# RTIG POSITION AT TIG VECTOR B+29 METERS
# VTIG VELOCITY AT TIG VECTOR B+29 METERS/CS
# PDL 4D APOGEE ALTITUDE DP B+29 M , B+27 METERS.
# HAPO APOGEE ALTITUDE DP B+29 METERS
# PDL 8D PERIGEE ALTITUDE DP B+29 M , B+27 METERS.
# HPER PERIGEE ALTITUDE DP B+29 METERS
# DELVSIN SPECIFIED DELTA-V IN INTERTIAL
# COORD. OF ACTIVE VEHICLE AT
# TIME OF IGNITION VECTOR B+7 METERS/CS
# DELVSAB MAG. OF DELVSIN VECTOR B+7 METERS/CS
#
# DEBRIS QTEMP TEMP. ERASABLE
# QPRET,MPAC
# PUSHLIST
SETLOC P30S1
BANK
COUNT* $$/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 617
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