P30-P31.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: P30-P31.agc
## Purpose: Part of the source code for Artemis (i.e., Colossus 3),
## build 072. This is for the Command Module's (CM)
## Apollo Guidance Computer (AGC), for
## Apollo 15-17.
## Assembler: yaYUL
## Contact: Jim Lawton <jim DOT lawton AT gmail DOT com>
## Website: www.ibiblio.org/apollo/index.html
## Page Scans: www.ibiblio.org/apollo/ScansForConversion/Artemis072/
## Mod history: 2009-08-11 JL Adapted from corresponding Comanche 055 file.
## 2009-09-03 JL Fixed symbol names.
## 2010-02-01 JL Fixed build errors.
## 2010-02-20 RSB Un-##'d this header.
## 2017-02-06 RSB Proofed comment text using octopus/ProoferComments,
## though the printout/scan quality is really too poor,
## since no corresponding file exists in any other AGC
## version against which it can be diff'd, and since
## traditional proofing is so poor at catching errors.
## Page 643
# PROGRAM DESCRIPTION P30 DATE 5-1-69
#
# MOD.I BY S. ZELDIN- TO ADD P31 AND ADAPT P30 FOR P31 USE. 22DEC67
# MOD.II BY P.WOLFF TO REDUCE CODING AND DELETE RESTART PROTECTION 4-30-69
# MOD.III BY C.BEALS TO DELETE P31 1NOV69
#
# FUNCTIONAL DESCRIPTION
# P30 (EXTERNAL DELTA-V TARGETTING PROGRAM)
# ACCEPTS ASTRONAUT INPUTS OF TIG,DELV(LV) AND COMPUTES, FOR DISPLAY,
# APOGEE, PERIGEE, DELV(MAG), MGA ASSOCIATED WITH DESIRED MANEUVER
#
# THE FOLLOWING SUBROUTINES ARE USED IN P30
# S30/31.1 COMPUTES APOGEE AND PERIGEE ALTITUDE
# P30/P31 - DISPLAYS TIG
# CNTUP30 - DISPLAYS DELV(LV)
# COMPTGO CLOCKTASK COMPUTE TTOGO
# LOMAT COMPUTE X,Y,Z IN LV COORDS
# PARAM30 - DISPLAYS APOGEE, PERIGEE, DELV(MAG), MGA, TIME FROM TIG,
# MARKS SINCE LAST THRUSTING MANEUVER
#
# CALLING SEQUENCE VIA JOB FROM V37
#
# EXIT VIA V37 CALL OR GOTOPOOH
#
# OUTPUT FOR POWERED FLIGHT
# VTIG X
# RTIG
# DELVSIN X
#
# P30 CALCULATIONS
#
# P30 CALC BASED ON STORED TARGET PARAMETERS (R OF IGNITION (RTIG), V OF
# IGNITION (VTIG), TIME OF IGNITION (TIG), DELV(LV), COMPUTE PERIGEE ALTITUDE
# APOGEE ALTITUDE AND DELTA-V REQUIRED IN REF. COORDS. (DELVSIN)
#
# ERASABLE INITIALIZATION REQUIRED
# TIG TIME OF IGNITION DP B28CS
# DELVSLV SPECIFIED DELTA-V IN LOCAL VERT.
# COORDS. OF ACTIVE VEHICLE AT
# TIME OF IGNITION VCT. B+7M/CS
#
# SUBROUTINES CALLED
# THISPREC
#
# OUTPUT
# RTIG POSITION AT TIG VCT. B+29M
# VTIG VELOCITY AT TIG VCT. B+7M
# DELVSIN DELVSLV IN REF COORDS VCT. B+7M/CS
#
# DEBRIS QTEMP TEMP. ERASABLE
# QPRET, MPAC
# PUSHLIST
SETLOC P30S1
BANK
## Page 644
EBANK= +MGA
COUNT* $$/P30
P30 TC UPFLAG
ADRES UPDATFLG # SET UPDATFLG
TC UPFLAG
ADRES TRACKFLG # SET TRACKFLG
DSP0633 CAF V06N33 # DISPLAY TIME OF IGNITION
TC VNFLASH
CAF V06N81
TC VNFLASH
TC UPFLAG
ADRES XDELVFLG # BIT 8 FLAG 2
TC INTPRET
CLEAR DLOAD
UPDATFLG # RESET UPDATFLG
TIG # TIME IGNITION SCALED AT 2(+28)CS
STCALL TDEC1
THISPREC # ENCKE ROUTINE FOR
VLOAD SXA,2
VATT
RTX2
STOVL VTIG
RATT
STORE RTIG
STORE RACT3
VXV UNIT
VTIG
STCALL UNRM
LOMAT
VLOAD VXM
DELVSLV
0
VSL1 SXA,1
RTX1
STORE DELVSIN
ABVAL
STOVL VGDISP # MAG DELV
RTIG
PDVL VAD
DELVSIN
VTIG
CALL
S30/31.1
EXIT
PARAM30 CAF V06N42 # DISPLAY HAPO, HPER, DELTAV
TC VNFLASH
REFTEST TC INTPRET
BOFF VLOAD
## Page 645
REFSMFLG # TEST FOR REFSMFLAG ON
NOTSET
DELVSIN
PUSH CALL
GET+MGA
EXIT
DISPMGA TC COMPTGO
DISP45 CAF V16N45 # DISPLAY MARK CNT, TFI, +MGA
TC VNFLASH
TC DOWNFLAG
ADRES TIMRFLAG # RESET TIMRFLAG
TCF GOTOPOOH
COMPTGO EXTEND
QXCH PHSPRDT6
TC UPFLAG # SET TIMRFLAG
ADRES TIMRFLAG
CAF ZERO
TS NVWORD1
CAF ONE
TC WAITLIST
EBANK= TIG
2CADR CLOKTASK
TC 2PHSCHNG
OCT 40036 # 6.3SPOT FOR CLOKTASK
OCT 05024 # GROUP 4 CONTINUES HERE
OCT 13000
6P3SPT1 = 6.3SPOT
TC PHSPRDT6
NOTSET DLOAD DCOMP
MARSDP
STORE +MGA
RTB
DISPMGA
MARSDP OCT 00000 # (00000) (16440) = (+00001)
OCT 35100
# ( .01 ) DEGREES IN THE LOW ORDER REGISTE
V06N42 VN 0642
## Page 646
# S30/31.1 SUBROUTINE USED BY P30/P31 CALCULATIONS
# MOD NO 1 LOG SECTION P30,P37
#
# FUNCTIONAL DESCRIPTION
# THROUGH A SERIES OF CALLS COMPUTES APOGEE AND PERIGEE ALTITUDE
#
# SUBROUTINES CALLED
# PERIAPO1
# SHIFTR1
# MAXCHK
#
# CALLING SEQUENCE
# L CALL
# L+1 S30/31.1
#
# NORMAL EXIT MODE
# AT L+2 OR CALLING SEQUENCE
#
# OUTPUT
# HAPO APOGEE ALT. DP B+29 M
# HPER PERIGEE ALT. DP B+29 M
SETLOC P30S1A
BANK
COUNT* $$/P30
S30/31.1 STQ CALL
QTEMP
PERIAPO1
CALL
SHIFTR1
CALL
MAXCHK
STODL HPER # PERIGEE ALT B+29
4D
CALL
SHIFTR1
CALL
MAXCHK
STCALL HAPO # APOGEE ALT B+29
QTEMP
## Page 647
# SUBROUTINE NAME: DELRSPL (CONTINUATION OF V 82 IN CSM IF P11 ACTI
# TRANSFERRED COMPLETELY FROM SUNDISK, P30S REV 33. 9 SEPT 67.
# MOD NO: 0 MOD BY: ZELDIN DATE:
# MOD NO: 1 MOD BY: RR BAIRNSFATHER DATE: 11 APR 67
# MOD NO: 2 MOD BY: RR BAIRNSFATHER DATE: 12 MAY 67 ADD UR.RT CALC WHEN BELOW 300K FT
# MOD NO: 2.1 MOD BY: RR BAIRNSFATHER DATE: 5 JULY 67 FIX ERROR IN MOD. 2.
# MOD NO: 3 MOD BY: RR BAIRNSFATHER DATE: 12 JUL 67 CHANGE SIGN OF DISPLAYED ERROR.
# MOD 4 MOD BY S.ZELDIN DATE 3 APRIL 68 CHANGE EQUATIONS FOR L/D=.18 WHICH REPLA
#
# FUNCTION: CALCULATE (FOR DISPLAY ON CALL) AN APPROXIMATE MEASURE OF IN-PLANE SPLASH DOWN
# ERROR. IF THE FREE-FALL TRANSFER ANGLE TO 300K FT ABOVE PAD RADIUS IS POSITIVE:
# SPLASH ERROR= -RANGE TO TARGET + FREE-FALL TRANSFER ANGLE + ESTIMATED ENTRY ANGLE.
# THE TARGET LOCATION AT ESTIMATED TIME OF IMPACT IS USED. IF THE FREE-FALL TRANSFER
# ANGLE IS NEGATIVE: SPLASH ERROR= -RANGE TO TARGET
# THE PRESENT TARGET LOCATION IS USED.
#
# CALLING SEQUENCE CALLED AFTER SR30.1 IF IN CSM AND IF P11 OPERATING (UNDER CONTROL OF V82)
#
# SUBROUTINES CALLED: VGAMCALC, TFF/TRIG, LALOTORV.
#
# EXIT RETURN DIRECTLY TO V 82 PROG. AT SPLRET
#
# ERASABLE INITIALIZATION LEFT BY SR30.1 AND V82GON1
#
# OUTPUT: RSP-RREC RANGE IN REVOLUTIONS DSKY DISPLAY IN N. MI.
#
# DEBRIS: QPRET, PDL0 ... PDL7, PDL10
# THETA(1)
SETLOC DELRSPL1
BANK
COUNT* $$/P30 # PROGRAMS: P30 EXTERNAL DELTA V
DELRSPL STORE 8D
BPL DSU
CANTDO # GONE PAST 300K FT ALT
1BITDP
BOV CALL
CANTDO # POSMAX INDICATES NO 300K FT SOLUTION.
VGAMCALC # +GAMMA(REV) IN PMAC,V300 MAG(B-7)=PDL 0
PUSH CALL
TFF/TRIG
CALL
AUGEKUGL
PDDL ACOS # T ENTRY PDL 6
CDELF/2
DAD
4
GETARG STOVL THETA(1)
LAT(SPL)
STODL LAT
HI6ZEROS
STODL ALT # ALT=0 = LAT +4
PIPTIME
BON DLOAD
## Page 648
V37FLAG
+2
TSTART82
DSU DAD
8D
CLEAR CALL
ERADFLAG
LALOTORV # R RECOV. IN ALPHAV AND MPAC
UNIT PDVL
RONE
UNIT DOT
SL1 ARCCOS
BDSU # ERROR = THETA EST - THETA TARG
# NEGATIVE NUMBER SIGNIFIES THAT WILL FALL SHORT.
# POSITIVE NUMBER SIGNIFIES THAT WILL OVERSHOOT.
THETA(1)
DELRDONE STCALL RSP-RREC # DOWNRANGE RECOVERY RANGE ERROR /360
INTWAKE0
CALL
SPLRET
CANTDO DLOAD PDDL # INITIALIZE ERASE TO DOT TARGET AND UR
# FOR RANGE ANGLE.
HIDPHALF # TO PDL 0 FOR DEN IN DDV.
HI6ZEROS
PUSH # ZERO TO PDL 2 FOR PHI ENTRY
STCALL 8D
GETARG # GO SET RSP-RREC =0
AUGEKUGL VLOAD
X1CON -2
STODL X1 -2
0
DSU BMN
V(21K)
LOOPSET
XSU,1 XCHX,2
S1
X1
XCHX,2 DSU
S1
V(3K)
BMN XCHX,2
LOOPSET
S1
DSU BMN
V(4K)
LOOPSET
XCHX,2 XCHX,2
S1
## Page 649
X1
DSU BMN
V(400)
LOOPSET
SXA,1
S1
LOOPSET INCR,1 GOTO
DEC 1
K1K2LOOP
K2CALC SXA,1
S1
K1K2LOOP DLOAD DSU*
0
V(32K) +1,1
DMP* DAD*
YK1K2 +1,1
CK1K2 +1,1
PDDL TIX,1
2
K2CALC
DSU BDDV
PUSH BOV # PHI ENTRY PDL 4D
MAXPHI
BMN DSU
MAXPHI
MAXPHIC
BPL
MAXPHI
PHICALC DLOAD DSU
0
V(26K)
BPL DLOAD
TGR26
TLESS26
DDV
0
TENT DMP RVQ
4D
TGR26 DLOAD GOTO
TGR26CON
TENT
MAXPHI DLOAD PDDL
MAXPHIC
GOTO
PHICALC
MAXPHIC 2DEC .09259298 # 2000 NM FOR MAXIMUM PHI ENTRY
COUNT* $$/P30
## Page 650
# BELOW
# <<<< TABLE IS INDEXED. KEEP IN ORDER >>>
2DEC 7.07304526 E-4 # 5500
2DEC 3.08641975 E-4 # 2400
2DEC 3.08641975 E-4 # 2400
2DEC -8.8888888 E-3 # -3.2
2DEC 2.7777777 E-3 # 1
CK1K2 2DEC 6.6666666 E-3 # 2.4
2DEC 0 # 0
2DEC* -1.86909989 E-5 B7* # -.443
2DEC 0
2DEC* 1.11639691 E-3 B7* # .001225
2DEC* 9.56911636 E-4 B7* # .00105
YK1K2 2DEC* 2.59733157 E-4 B7* # .000285
V(400) 2DEC 1.2192 B-7
V(28K) 2DEC 85.344 B-7
V(3K) 2DEC 9.144 B-7
V(24K) 2DEC 73.152 B-7
2DEC 85.344 B-7
V(32K) 2DEC 97.536 B-7
V(4K) 2DEC 12.192 B-7
V(21K) 2DEC 64.008 B-7
TLESS26 2DEC* 5.70146688 E7 B-35* # 8660PHI/V
TGR26CON 2DEC 7.2 E5 B-28 # PHI/3
V(26K) 2DEC 79.248 B-7 # 26000
X1CON DEC 10
## Page 651
DEC 8
DEC 6
# <<<< TABLE IS INDEXED. KEEP IN ORDER >>>
# ABOVE
## Page 652
# ***** AVFLAGA/P *****
#
# SUBROUTINES USED
#
# UPFLAG
# DOWNFLAG
SETLOC P30SUBS
BANK
COUNT* $$/P30
EBANK= SUBEXIT
AVFLAGA EXTEND # AVFLAG = CSM
QXCH SUBEXIT
TC DOWNFLAG
ADRES AVFLAG # BIT 5 FLAG 2
TC E7SETTER
EBANK= ECSTEER
CAF BIT13
TS ECSTEER # SET ECSTEER = 1
CAF EBANK4
TS EBANK
EBANK= SUBEXIT
TC SUBEXIT
AVFLAGP EXTEND # AVFLAG = LEM
QXCH SUBEXIT
TC UPFLAG
ADRES AVFLAG # BIT 5 FLAG 2
TC SUBEXIT
P20FLGON EXTEND
QXCH SUBEXIT
TC UPFLAG
ADRES TRACKFLG
TC UPFLAG
ADRES UPDATFLG
TC DOWNFLAG
ADRES PCFLAG
TC SUBEXIT
## Page 653
SETLOC P31TAG
BANK
COUNT* $$/P3136
P31 TC AVFLAGA
TC P20FLGON # SET TRACK,UPDATE, CLEAR FINAL FLAGS
TC INTPRET
P31ALMRT CLEAR CALL
CSISFLAG
INPUTDSP
BOFF AXC,1
CMOONFLG
COMPMU
10D
COMPMU VLOAD ABVAL
RRECTCSM
PUSH PDVL* # PL AT 04D
MUTABLE,1 # RTX1=1/MU B+34,B+28, RTMU=SQRT(MU)
STOVL RTX1 # B-18,B-15, RTSR1/MU=1/SQRT(MU) B+17,B+14
VRECTCSM
VSQ DMPR
RTX1 # VSQ/MU B+2 ,B+18
DMP SL3 # R VSQ/MU PL AT 02D B-6
BDSU SR1R
D1/32 # ( 2 - R VSQ/MU ) B-7
DDV PUSH # ( 2 - R VSQ/MU )/R AT 00D B+22,B+20
SQRT BDDV # 2 PI R/(2 - R VSQ/MU) B-15,B-14
2PISC
DMP PDDL # 2PI R SQRT(MU)/(2MU-R VSQ) B-2,B-0
RTSR1/MU
NORM PDDL
X1
SL* DDV
0 -7D,1 # HAFPA1 = PERIOD/2 B-28
BDSU # TIG = ( TCSI - HAFPA1 ) B-28
TCSI
STORE TIG # TIG = ( TCSI - PERIOD/2 ) B-28
EXIT
CA V06N33
TC VNFLASH
TC INTPRET
P31ONWRD CALL
SELECTMU
P31RECYC SET DLOAD
HAFLAG
TCSI
CALL
P31ENT
P31RT VLOAD
## Page 654
ZEROVEC
STODL DELVLVC
DIFFALT # DELTA H AT CDH
DAD DMPR
HAMDELH # METERS B-29
25THOUS # K = -.025 B-0
SL CALL
5D
N90/N81
CALL # X
VN1645 # S32/33.1, DISPLAYS AND COMPUTES DELVLVC
GOTO # AND DELVSIN.
P31RECYC
25THOUS 2DEC* -.4114470842 E-5 B+17* # B+17
130DEGLO OCT 13434
OCT 16163
208DEGLO OCT 22407
OCT 36673
SETLOC P36TAG
BANK
## Page 655
# PLANE CHANGE TARGETING PROGRAM P36
#
# PURPOSE
# TO COMPUTE PARAMETERS FOR PLANE CHANGE MANEUVER
#
# INPUT
# TCSI
#
# OUTPUT
# TIG TIME OF PLANE CHANGE MANEUVER COMPUTED TO BE
# TCSI + 90 DEG TRANSFER TIME
# DELVLVC DELTA VELOCITY AT PC - LOCAL VERTICAL
# DELVSIN DELTA VELOCITY AT PC - REFERENCE
COUNT* $$/P3136
P36 TC AVFLAGA
TC P20FLGON # SET TRACK,UPDATE - CLEAR PC FLAGS
TC UPFLAG
ADRES PCFLAG
TC INTPRET
CALL
SELECTMU
P36A SET DLOAD
XDELVFLG
TCSI
STCALL TDEC1
CSMCONIC # INTEGRATE STATES TO TCSI
DLOAD SET
ZEROVECS
RVSW
STODL CSTH # COS 90 DEGREES
CS359+
STOVL SNTH # SINE 90 DEGREES
RATT
PDVL CALL
VATT
VECSHIFT
STOVL VVEC
STADR
STCALL RVEC # COMPUTE TRANSFER TIME OF 90 DEG
TIMETHET
DAD
TCSI
STORE TIG
EXIT
CAF V06N33
TC VNFLASH
TC INTPRET
CALL
## Page 656
VN1645
P36RECYC VLOAD CALL
ZEROVECS
N90/N81 # DISPLAY N90,N81 COMPUTE YDOT
CALL
VN1645
GOTO
P36RECYC
SETLOC N90TAG
BANK
## Page 657
# ...... N90/N81 ....... COMPUTES YDOT, DISPLAYS N90 AND N81 FOR P31, P36
COUNT* $$/P3136
N90/N81 STQ
N90RET
STODL DELVLVC
TIG
STCALL TDEC1
PRECSET
BON SET
FINALFLG
+2
UPDATFLG
+2 VLOAD
VACT3
STOVL VTIG
RACT3
STCALL RTIG
DISPN90
CALL
LOMAT
VLOAD VXM
DELVLVC # ROTATE DV (LV TO REF)
0D
VSL1
STCALL DELVSIN
N90RET
