Reassign AGC file extension to assembly files
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Alhadis
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Luminary099/RTB_OP_CODES.agc
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Luminary099/RTB_OP_CODES.agc
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# Copyright: Public domain.
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# Filename: RTB_OP_CODES.agc
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# Purpose: Part of the source code for Luminary 1A build 099.
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# It is part of the source code for the Lunar Module's (LM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 1397-1401
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# Mod history: 2009-05-10 SN (Sergio Navarro). Started adapting
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# from the Luminary131/ file of the same
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# name, using Luminary099 page images.
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#
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# This source code has been transcribed or otherwise adapted from
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# digitized images of a hardcopy from the MIT Museum. The digitization
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# was performed by Paul Fjeld, and arranged for by Deborah Douglas of
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# the Museum. Many thanks to both. The images (with suitable reduction
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# in storage size and consequent reduction in image quality as well) are
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# available online at www.ibiblio.org/apollo. If for some reason you
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# find that the images are illegible, contact me at info@sandroid.org
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# about getting access to the (much) higher-quality images which Paul
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# actually created.
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#
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# Notations on the hardcopy document read, in part:
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#
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# Assemble revision 001 of AGC program LMY99 by NASA 2021112-61
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# 16:27 JULY 14, 1969
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# Page 1397
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BANK 22
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SETLOC RTBCODES
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BANK
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EBANK= XNB
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COUNT* $$/RTB
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# LOAD TIME2, TIME1 INTO MPAC:
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LOADTIME EXTEND
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DCA TIME2
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TCF SLOAD2
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# CONVERT THE SINGLE PRECISION 2'S COMPLEMENT NUMBER ARRIVING IN MPAC (SCALED IN HALF-REVOLUTIONS) TO A
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# DP 1'S COMPLEMENT NUMBER SCALED IN REVOLUTIONS.
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CDULOGIC CCS MPAC
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CAF ZERO
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TCF +3
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NOOP
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CS HALF
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TS MPAC +1
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CAF ZERO
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XCH MPAC
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EXTEND
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MP HALF
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DAS MPAC
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TCF DANZIG # MODE IS ALREADY AT DOUBLE-PRECISION
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# FORCE TP SIGN AGREEMENT IN MPAC:
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SGNAGREE TC TPAGREE
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TCF DANZIG
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# CONVERT THE DP 1'S COMPLEMENT ANGLE SCALED IN REVOLUTIONS TO A SINGLE PRECISION 2'S COMPLEMENT ANGLE
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# SCALED IN HALF-REVOLUTIONS.
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1STO2S TC 1TO2SUB
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CAF ZERO
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TS MPAC +1
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TCF NEWMODE
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# DO 1STO2S ON A VECTOR OF ANGLES:
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V1STO2S TC 1TO2SUB # ANSWER ARRIVES IN A AND MPAC.
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DXCH MPAC +5
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DXCH MPAC
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TC 1TO2SUB
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# Page 1398
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TS MPAC +2
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DXCH MPAC +3
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DXCH MPAC
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TC 1TO2SUB
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TS MPAC +1
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CA MPAC +5
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TS MPAC
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TPMODE CAF ONE # MODE IS TP.
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TCF NEWMODE
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# V1STO2S FOR 2 COMPONENT VECTOR. USED BY RR.
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2V1STO2S TC 1TO2SUB
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DXCH MPAC +3
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DXCH MPAC
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TC 1TO2SUB
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TS L
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CA MPAC +3
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TCF SLOAD2
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# SUBROUTINE TO DO DOUBLING AND 1'S TO 2'S CONVERSION:
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1TO2SUB DXCH MPAC # FINAL MPAC +1 UNSPECIFIED.
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DDOUBL
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CCS A
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AD ONE
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TCF +2
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COM # THIS WAS REVERSE OF MSU.
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TS MPAC # AND SKIP ON OVERFLOW.
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TC Q
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INDEX A # OVERFLOW UNCORRECT AND IN MSU.
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CAF LIMITS
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ADS MPAC
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TC Q
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# THE FOLLOWING ROUTINE INCREMENTS IN 2S COMPLEMENT THE REGISTER WHOSE ADDRESS IS IN BUF BY THE 1S COMPL.
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# QUANTITY FOUND IN TEM2. THIS MAY BE USED TO INCRMENT DESIRED IMU AND OPTICS CDU ANGLES OR ANY OTHER 2S COMPL.
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# (+0 UNEQUAL TO -0) QUANTITY. MAY BE CALLED BY BANKCALL/SWCALL.
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CDUINC TS TEM2 # 1S COMPL.QUANT. ARRIVES IN ACC. STORE IT
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INDEX BUF
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CCS 0 # CHANGE 2S COMPL. ANGLE(IN BUF)INTO 1S
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AD ONE
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TCF +4
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AD ONE
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# Page 1399
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AD ONE # OVEFLOW HERE IF 2S COMPL. IS 180 DEG.
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COM
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AD TEM2 # SULT MOVES FROM 2ND TO 3D QUAD. (OR BACK)
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CCS A # BACK TO 2S COMPL.
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AD ONE
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TCF +2
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COM
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TS TEM2 # STORE 14BIT QUANTITY WITH PRESENT SIGN
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TCF +4
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INDEX A # SIGN.
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CAF LIMITS # FIX IT, BY ADDING IN 37777 OR 40000
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AD TEM2
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INDEX BUF
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TS 0 # STORE NEW ANGLE IN 2S COMPLEMENT.
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TC Q
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# Page 1400
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# RTB TO TORQUE GYROS, EXCEPT FOR THE CALL TO IMUSTALL. ECADR OF COMMANDS ARRIVES IN X1.
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PULSEIMU INDEX FIXLOC # ADDRESS OF GYRO COMMANDS SHOULD BE IN X1
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CA X1
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TC BANKCALL
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CADR IMUPULSE
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TCF DANZIG
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# Page 1401
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# THE SUBROUTINE SIGNMPAC SETS C(MPAC, MPAC +1) TO SIGN(MPAC).
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# FOR THIS, ONLY THE CONTENTS OF MPAC ARE EXAMINED. ALSO +0 YIELDS POSMAX AND -0 YIELDS NEGMAX.
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#
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# ENTRY MAY BE BY EITHER OF THE FOLLOWING:
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# 1. LIMIT THE SIZE OF MPAC ON INTERPRETIVE OVERFLOW:
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# ENTRY: BOVB
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# SIGNMPAC
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# 2. GENERATE IN MPAC THE SIGNUM FUNCTION OF MPAC:
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# ENTRY: RTB
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# SIGNMPAC
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# IN EITHER CASE, RETURN IS TO TEH NEXT INTERPRETIVE INSTRUCTION IN THE CALLING SEQUENCE.
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SIGNMPAC EXTEND
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DCA DPOSMAX
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DXCH MPAC
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CCS A
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DPMODE CAF ZERO # SETS MPAC +2 TO ZERO IN THE PROCESS
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TCF SLOAD2 +2
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TCF +1
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EXTEND
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DCS DPOSMAX
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TCF SLOAD2
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# RTB OP CODE NORMUNIT IS LIKE INTERPRETIVE INSTRUCTION UNIT, EXCEPT THAT IT CAN BE DEPENDED ON NOT TO BLOW
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# UP WHEN THE VECTOR BEING UNITIZED IS VERY SMALL -- IT WILL BLOW UP WHEN ALL COMPONENT ARE ZERO. IF NORMUNIT
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# IS USED AND THE UPPER ORDER HALVES OF ALL COMPONENTS ARE ZERO, THE MAGNITUDE RETURNED IN 36D WILL BE TOO LARGE
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# BY A FACTOR OF 2(13) AND THE SQUARED MAGNITUDE RETURNED ATE 34D WILL BE TOO BIG BY A FACTOR OF 2(26).
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NORMUNX1 CAF ONE
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TCF NORMUNIT +1
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NORMUNIT CAF ZERO
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AD FIXLOC
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TS MPAC +2
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TC BANKCALL # GET SIGN AGREEMENT IN ALL COMPONENTS
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CADR VECAGREE
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CCS MPAC
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TCF NOSHIFT
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TCF +2
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TCF NOSHIFT
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CCS MPAC +3
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TCF NOSHIFT
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TCF +2
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TCF NOSHIFT
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CCS MPAC +5
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TCF NOSHIFT
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TCF +2
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TCF NOSHIFT
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# Page 1402
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CA MPAC +1 # SHIFT ALL COMPONENTS LEFT 13
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EXTEND
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MP BIT14
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DAS MPAC # DAS GAINS A LITTLE ACCURACY
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CA MPAC +4
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EXTEND
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MP BIT14
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DAS MPAC +3
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CA MPAC +6
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EXTEND
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MP BIT14
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DAS MPAC +5
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CAF THIRTEEN
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INDEX MPAC +2
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TS 37D
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OFFTUNIT TC POSTJUMP
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CADR UNIT +1 # SKIP THE "TC VECAGREE" DONE AT UNIT
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NOSHIFT CAF ZERO
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TCF OFFTUNIT -2
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# RTB VECSGNAG ... FORCES SIGN AGREEMENT OF VECTOR IN MPAC.
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VECSGNAG TC BANKCALL
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CADR VECAGREE
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TC DANZIG
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# *** END OF SKIPPER .087 ***
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