### FILE="Main.annotation"
## Copyright:	Public domain.
## Filename:	MYSUBS.agc
## Purpose:	Part of the source code for Colossus 2A, AKA Comanche 055.
##		It is part of the source code for the Command Module's (CM)
##		Apollo Guidance Computer (AGC), for Apollo 11.
## Assembler:	yaYUL
## Contact:	Ron Burkey <info@sandroid.org>.
## Website:	www.ibiblio.org/apollo.
## Pages:	999-1001
## Mod history:	2009-05-13 RSB	Adapted from the Colossus249/ file of the
##				same name, using Comanche055 page images.
##		2009-05-20 RSB	Corrections: EBANK= changed from MPAC to KMPAC.
##		2016-12-21 RSB	Proofed comment text using octopus/ProoferComments
##				but no errors found.
##
## 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 055 of AGC program Comanche by NASA
##	2021113-051.  10:28 APR. 1, 1969  
##
##	This AGC program shall also be referred to as
##			Colossus 2A

## Page 999
		BANK	20
		SETLOC	MYSUBS
		BANK
		
		EBANK=	KMPAC
SPCOS1		EQUALS	SPCOS
SPSIN1		EQUALS	SPSIN
SPCOS2		EQUALS	SPCOS
SPSIN2		EQUALS	SPSIN

		COUNT	21/DAPMS
		
# ONE AND ONE HALF PRECISION MULTIPLICATION ROUTINE

SMALLMP		TS	KMPTEMP		# A(X+Y)
		EXTEND
		MP	KMPAC 	+1
		TS	KMPAC 	+1	# AY
		CAF	ZERO
		XCH	KMPAC
		EXTEND
		MP	KMPTEMP		# AX
		DAS	KMPAC		# AX+AY
		TC	Q
		
# SUBROUTINE FOR DOUBLE PRECISION ADDITIONS OF ANGLES
# A AND L CONTAIN A DP(1S) ANGLE SCALED BY 180 DEGS TO BE ADDED TO KMPAC.
# RESULT IS PLACED IN KMPAC.  TIMING = 6 MCT (22 MCT ON OVERFLOW)

DPADD		DAS	KMPAC
		EXTEND
		BZF	TSK 	+1	# NO OVERFLOW
		CCS	KMPAC
		TCF	DPADD+		# + OVERFLOW
		TCF	+2
		TCF	DPADD-		# - OVERFLOW
		CCS	KMPAC 	+1
		TCF	DPADD2+		# UPPER = 0, LOWER +
		TCF	+2
		COM			# UPPER = 0, LOWER -
		AD	POSMAX		# LOWER = 0, A = 0
		TS	KMPAC 	+1	# CAN NOT OVERFLOW
		CA	POSMAX		# UPPER WAS = 0
TSK		TS	KMPAC
		TC	Q
		
DPADD+		AD	NEGMAX		# KMPAC GREATER THAN 0
		TCF	TSK

## Page 1000
DPADD-		COM
		AD	POSMAX		# KMPAC LESS THAN 0
		TCF	TSK
		
DPADD2+		AD	NEGMAX		# CAN NOT OVERFLOW
		TS	KMPAC 	+1
		CA	NEGMAX		# UPPER WAS = 0
		TCF	TSK

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