### FILE="Main.annotation"
## Copyright:   Public domain.
## Filename:    P30,P37.agc
## Purpose:     A section of LUM69 revision 2.
##              It is part of the reconstructed source code for the flown
##              version of the flight software for the Lunar Module's (LM)
##              Apollo Guidance Computer (AGC) for Apollo 10. The code has
##              been recreated from a copy of Luminary revsion 069, using
##              changes present in Luminary 099 which were described in
##              Luminary memos 75 and 78. The code has been adapted such
##              that the resulting bugger words exactly match those specified
##              for LUM69 revision 2 in NASA drawing 2021152B, which gives
##              relatively high confidence that the reconstruction is correct.
## Reference:   pp. 624-627
## Assembler:   yaYUL
## Contact:     Ron Burkey <info@sandroid.org>.
## Website:     www.ibiblio.org/apollo/index.html
## Mod history: 2019-07-27 MAS  Created from Luminary 69.

## Page 624
# 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	EXIT
			UPDATFLG
PARAM30		CAF	V06N42		# DISPLAY APOGEE,PERIGEE ,DELTA V
		TC	VNPOOH
## Page 625		
		
		TC	INTPRET
		SETGO
			XDELVFLG	# FOR P40'S: EXTERNAL DELTA-V GUIDANCE.
			REVN1645	# TRKMKCNT, TGO, +MGA  DISPLAY
			
V06N33		VN	0633
V06N42		VN	0642

## Page 626
# 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 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 627
			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