### FILE="Main.annotation"
## Copyright:	Public domain.
## Filename:	ALARM_AND_ABORT.agc
## Purpose:	Part of the source code for Colossus, build 249.
##		It is part of the source code for the Command Module's (CM)
##		Apollo Guidance Computer (AGC), for Apollo 9.
## Assembler:	yaYUL
## Reference:	Starts on p. 1461
## Contact:	Ron Burkey <info@sandroid.org>.
## Website:	www.ibiblio.org/apollo.
## Mod history:	08/30/04   RSB	Adapted from corresponding Luminary131 file.
##		2010-10-24 JL	Indentation fixes.
##              2011-05-07 JL   Removed workarounds.
##		2017-01-06 RSB	Page numbers now agree with those on the
##				original harcopy, as opposed to the PDF page
##				numbers in 1701.pdf.
##		2017-01-07 RSB	Cross-diff'd comment text (not whitespace)
##				vs the already-proofed corresponding Colossus
##				237 and Comanche 55 source-code files
##				and corrected errors found.
##
## The contents of the "Colossus249" files, in general, are transcribed 
## from a scanned copy of the program listing.  Notations on this
## document read, in part:
##
##	Assemble revision 249 of AGC program Colossus by NASA
##	2021111-041.  October 28, 1968.  
##
##	This AGC program shall also be referred to as
##				Colossus 1A
##
##	Prepared by
##			Massachusetts Institute of Technology
##			75 Cambridge Parkway
##			Cambridge, Massachusetts
##	under NASA contract NAS 9-4065.
##
## Refer directly to the online document mentioned above for further information.
## Please report any errors (relative to the scanned pages) to info@sandroid.org.
##
## In some cases, where the source code for Luminary 131 overlaps that of 
## Colossus 249, this code is instead copied from the corresponding Luminary 131
## source file, and then is proofed to incorporate any changes.

## Page 1461
# THE FOLLOWING SUBROUTINE MAY BE CALLED TO DISPLAY A NON-ABORTIVE ALARM CONDITION.  IT MAY BE CALLED
# EITHER IN INTERRUPT OR UNDER EXECUTIVE CONTROL.
#
# CALLING SEQUENCE IS AS FOLLOWS:
#		TC	ALARM
#		OCT	AAANN		ALARM NO. NN IN GENERAL AREA AAA.
#					(RETURNS HERE)

		BLOCK	02
		SETLOC	FFTAG7
		BANK

		EBANK=	FAILREG

		COUNT	02/ALARM

# ALARM TURNS ON THE PROGRAM ALARM LIGHT, BUT DOES NOT DISPLAY.

ALARM		INHINT

		CA	Q
ALARM2		TS	ALMCADR
		INDEX	Q
		CA	0
BORTENT		TS	L

PRIOENT		CA	BBANK
 +1		EXTEND
		ROR	SUPERBNK	# ADD SUPER BITS.
		TS	ALMCADR +1

LARMENT		CA	Q		# STORE RETURN FOR ALARM
		TS	ITEMP1

CHKFAIL1	CCS	FAILREG		# IS ANYTHING IN FAILREG
		TCF	CHKFAIL2	# YES TRY NEXT REG
		LXCH	FAILREG
		TCF	PROGLARM	# TURN ALARM LIGHT ON FOR FIRST ALARM

CHKFAIL2	CCS	FAILREG +1
		TCF	FAIL3
		LXCH	FAILREG +1
		TCF	MULTEXIT
		
FAIL3		CA	FAILREG +2
		MASK	POSMAX
		CCS	A
		TCF	MULTFAIL
		LXCH	FAILREG +2
## Page 1462
		TCF	MULTEXIT
		
PROGLARM	CS	DSPTAB +11D
		MASK	OCT40400
		ADS	DSPTAB +11D

MULTEXIT	XCH	ITEMP1		# OBTAIN RETURN ADDRESS IN A
		RELINT
		INDEX	A
		TC	1

MULTFAIL	CA	L
		AD	BIT15
		TS	FAILREG +2
		
		TCF	MULTEXIT

# PRIOLARM DISPLAYS V05N09 VIA PRIODSPR WITH 3 RETURNS TO THE USER FROM THE ASTRONAUT AT CALL LOC +1,+2,+3 AND
# AN IMMEDIATE RETURN TO THE USER AT CALL LOC +4.  EXAMPLE FOLLOWS,
#		CAF	OCTXX		ALARM CODE
#		TC	BANKCALL
#		CADR	PRIOLARM
#		...	...
#		...	...
#		...	...		ASTRONAUT RETURN
#		TC	PHASCHNG	IMMEDIATE RETURN TO USER.  RESTART
#		OCT	X.1		PHASE CHANGE FOR PRIO DISPLAY

		BANK	10
		SETLOC	DISPLAYS
		BANK

		COUNT	10/DSPLA
PRIOLARM	INHINT			# * * * KEEP IN DISPLAY ROUTINES BANK
		TS	L		# SAVE ALARM CODE

		CA	BUF2		# 2 CADR OF PRIOLARM USER
		TS	ALMCADR
		CA	BUF2 +1
		TC	PRIOENT +1	# * LEAVE L ALONE
-2SEC		DEC	-200		# *** DONT MOVE
		CAF	V05N09
		TCF	PRIODSPR

		BLOCK	02
		SETLOC	FFTAG7
		BANK

## Page 1463
		COUNT	02/ALARM
		
BAILOUT		INHINT
		CA	Q
		TS	ALMCADR

		INDEX	Q
		CAF	0
		TC	BORTENT
OCT40400	OCT	40400

		INHINT
WHIMPER		CA	TWO
		AD	Z
		TS	BRUPT
		RESUME
		TC	POSTJUMP	# RESUME SENDS CONTROL HERE
		CADR	ENEMA
POODOO		INHINT
		CA	Q
ABORT2		TS	ALMCADR
		INDEX	Q
		CAF	0
		TC	BORTENT
OCT77770	OCT	77770		# DONT MOVE
		CA	V37FLBIT	# IS AVERAGE G ON
		MASK	FLAGWRD7
		CCS	A
		TC	WHIMPER -1	# YES.  DONT DO POODOO.  DO BAILOUT.

		TC	BANKCALL
		CADR	MR.KLEAN
		TC	WHIMPER
		
CCSHOLE		INHINT
		CA	Q
		TC	ABORT2
OCT1103		OCT	1103
CURTAINS	INHINT
		CA	Q
		TC	ALARM2
OCT217		OCT	00217
		TC	ALMCADR		# RETURN TO USER

DOALARM		EQUALS	ENDOFJOB

# CALLING SEQUENCE FOR VARALARM
#		CAF	(ALARM)
#		TC	VARALARM
## Page 1464

# VARALARM TURNS ON PROGRAM ALARM LIGHT BUT DOES NOT DISPLAY

VARALARM	INHINT

		TS	L		# SAVE USERS ALARM CODE

		CA	Q		# SAVE USERS Q
		TS	ALMCADR

		TC	PRIOENT
OCT14		OCT	14		# DONT MOVE

		TC	ALMCADR		# RETURN TO USER

ABORT		EQUALS	BAILOUT		# *** TEMPORARY UNTIL ABORT CALLS OUT