447 lines
11 KiB
Plaintext
447 lines
11 KiB
Plaintext
# Copyright: Public domain.
|
|
# Filename: POWERED_FLIGHT_SUBROUTINES.agc
|
|
# Purpose: Part of the source code for Luminary 1A build 099.
|
|
# It is part of the source code for the Lunar Module's (LM)
|
|
# Apollo Guidance Computer (AGC), for Apollo 11.
|
|
# Assembler: yaYUL
|
|
# Contact: Ron Burkey <info@sandroid.org>.
|
|
# Website: www.ibiblio.org/apollo.
|
|
# Pages: 1259-1267
|
|
# Mod history: 2009-05-26 RSB Adapted from the corresponding
|
|
# Luminary131 file, using page
|
|
# images from Luminary 1A.
|
|
# 2011-01-06 JL Fixed pseudo-label indentation.
|
|
#
|
|
# 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 001 of AGC program LMY99 by NASA 2021112-061
|
|
# 16:27 JULY 14, 1969
|
|
|
|
# Page 1259
|
|
BANK 14 # SAME FBANK AS THE FINDCDUD SUB-PROGRAM
|
|
SETLOC POWFLITE
|
|
BANK
|
|
|
|
EBANK= DEXDEX
|
|
COUNT* $$/POWFL
|
|
|
|
# CDUTRIG, CDUTRIG1, CDUTRIG2, AND CD*TR*GS ALL COMPUTE THE SINES AND
|
|
# COSINES OF THREE 2'S COMPLEMENT ANGLES AND PLACE THE RESULT, DOUBLE
|
|
# PRECISION, IN THE SAME ORDER AS THE INPUTS, AT SINCDU AND COSCDU. AN
|
|
# ADDITIONAL OUTPUT IS THE 1'S COMPLEMENT ANGLES AT CDUSPOT. THESE
|
|
# ROUTINES GO OUT OF THEIR WAY TO LEAVE THE MPAC AREA AS THEY FIND IT,
|
|
# EXCEPT FOR THE GENERALLY UNIMPORTANT MPAC +2. THEY DIFFER ONLY IN
|
|
# WHERE THEY GET THE ANGLES, AND IN METHOD OF CALLING.
|
|
#
|
|
# CDUTRIG (AND CDUTRIG1, WHICH CAN BE CALLED IN BASIC) COMPUTE THE
|
|
# SINES AND COSINES FROM THE CURRENT CONTENTS OF THE CDU REGISTERS.
|
|
# THE CONTENTS OF CDUTEMP, ETC., ARE NOT TOUCHED SO THAT THEY MAY
|
|
# CONTINUE TO FORM A CONSISTENT SET WITH THE LATEST PIPA READINGS.
|
|
#
|
|
# CDUTRIG1 IS LIKE CDUTRIG EXCEPT THAT IT CAN BE CALLED IN BASIC.
|
|
#
|
|
# CD*TR*GS FINDS CDU VALUES IN CDUSPOT RATHER THAN IN CDUTEMP. THIS
|
|
# ALLOWS USERS TO MAKE TRANSFORMATIONS USING ARBITRARY ANGLES, OR REAL
|
|
# ANGLES IN AN ORDER OTHER THAN X Y Z. A CALL TO THIS ROUTINE IS
|
|
# NECESSARY IN PREPARATION FOR A CALL TO AX*SR*T IN EITHER OF ITS TWO
|
|
# MODES (SMNB OR NBSM). SINCE AX*SR*T EXPECTS TO FIND THE SINES AND
|
|
# COSINES IN THE ORDER Y Z X THE ANGLES MUST HAVE BEEN PLACED IN CDUSPOT
|
|
# IN THIS ORDER. CD*TR*GS NEED NOT BE REPEATED WHEN AX*SR*T IS CALLED
|
|
# MORE THAN ONCE, PROVIDED THE ANGLES HAVE NOT CHANGED. NOTE THAT SINCE
|
|
# IT CLOBBERS BUF2 (IN THE SINE AND COSINE ROUTINES) CD*TR*GS CANNOT BE
|
|
# CALLED USING BANKCALL. SORRY.
|
|
#
|
|
# CD*TR*G IS LIKE CD*TR*GS EXCEPT THAT IT CAN BE CALLED IN
|
|
# INTERPRETIVE.
|
|
|
|
CDUTRIG EXIT
|
|
TC CDUTRIGS
|
|
TC INTPRET
|
|
RVQ
|
|
|
|
CD*TR*G EXIT
|
|
TC CD*TR*GS
|
|
TC INTPRET
|
|
RVQ
|
|
|
|
CDUTRIGS CA CDUX
|
|
TS CDUSPOT +4
|
|
CA CDUY
|
|
TS CDUSPOT
|
|
# Page 1260
|
|
CA CDUZ
|
|
TS CDUSPOT +2
|
|
|
|
CD*TR*GS EXTEND
|
|
QXCH TEM2
|
|
CAF FOUR
|
|
TR*GL**P MASK SIX # MAKE IT EVEN AND SMALLER
|
|
TS TEM3
|
|
INDEX TEM3
|
|
CA CDUSPOT
|
|
DXCH MPAC # STORING 2'S COMP ANGLE, LOADING MPAC
|
|
DXCH VBUF +4 # STORING MPAC FOR LATER RESTORATION
|
|
TC USPRCADR
|
|
CADR CDULOGIC
|
|
EXTEND
|
|
DCA MPAC
|
|
INDEX TEM3
|
|
DXCH CDUSPOT # STORING 1'S COMPLEMENT ANGLE
|
|
TC USPRCADR
|
|
CADR COSINE
|
|
DXCH MPAC
|
|
INDEX TEM3
|
|
DXCH COSCDU # STORING COSINE
|
|
EXTEND
|
|
INDEX TEM3
|
|
DCA CDUSPOT # LOADING 1'S COMPLEMENT ANGLE
|
|
TC USPRCADR
|
|
CADR SINE +1 # SINE +1 EXPECTS ARGUMENT IN A AND L
|
|
DXCH VBUF +4 # BRINGING UP PRIOR MPAC TO BE RESTORED
|
|
DXCH MPAC
|
|
INDEX TEM3
|
|
DXCH SINCDU
|
|
CCS TEM3
|
|
TCF TR*GL**P
|
|
TC TEM2
|
|
# Page 1261
|
|
# *******************************************************************************************************
|
|
# QUICTRIG, INTENDED FOR GUIDANCE CYCLE USE WHERE TIME IS CRITICAL, IS A MUCH FASTER VERSION OF CD*TR*GS.
|
|
# QUICTRIG COMPUTES AND STORES THE SINES AND COSINES OF THE 2'S COMPLEMENT ANGLES AT CDUSPOT, CDUSPOT +2,
|
|
# AND CDUSPOT +4. UNLIKE CD*TR*GS, QUICTRIG DOES NOT LEAVE THE 1'S COMPLEMENT VERSIONS OF THE ANGLES IN
|
|
# CDUSPOT. QUICTRIG'S EXECUTION TIME IS 4.1 MS; THIS IS 10 TIMES AS FAST AS CD*TR*GS. QUICTRIG MAY BE
|
|
# CALLED FROM INTERPRETIVE AS AN RTB OP-CODE, OR FROM BASIC VIA BANKCALL OR IBNKCALL.
|
|
|
|
QUICTRIG INHINT # INHINT SINCE DAP USES THE SAME TEMPS
|
|
EXTEND
|
|
QXCH ITEMP1
|
|
CAF FOUR
|
|
+4 MASK SIX
|
|
TS ITEMP2
|
|
INDEX ITEMP2
|
|
CA CDUSPOT
|
|
TC SPSIN
|
|
EXTEND
|
|
MP BIT14 # SCALE DOWN TO MATCH INTERPRETER OUTPUTS
|
|
INDEX ITEMP2
|
|
DXCH SINCDU
|
|
INDEX ITEMP2
|
|
CA CDUSPOT
|
|
TC SPCOS
|
|
EXTEND
|
|
MP BIT14
|
|
INDEX ITEMP2
|
|
DXCH COSCDU
|
|
CCS ITEMP2
|
|
TCF QUICTRIG +4
|
|
CA ITEMP1
|
|
RELINT
|
|
TC A
|
|
|
|
# Page 1262
|
|
#****************************************************************************
|
|
# THESE INTERFACE ROUTINES MAKE IT POSSIBLE TO CALL AX*SR*T, ETC., IN
|
|
# INTERPRETIVE. LATER, WHERE POSSIBLE, THEY WILL BE ELIMINATED.
|
|
#
|
|
# THESE INTERFACE ROUTINES ARE PERMANENT. ALL RESTORE USER'S EBANK
|
|
# SETTING. ALL ARE STRICT INTERPRETIVE SUBROUTINES, CALLED USING "CALL",
|
|
# RETURNING VIA QPRET. ALL EXPECT AND RETURN THE VECTOR TO BE TRANSFOR-
|
|
# MED INTERPRETER-STYLE IN MPAC; COMPONENTS AT MPAC, MPAC +3, AND MPAC +5.
|
|
#
|
|
# TRG*SMNB AND TRG*NBSM BOTH EXPECT TO SEE THE 2'S COMPLEMENT ANGLES
|
|
# AT CDUSPOT (ORDER Y Z X, AT CDUSPOT, CDUSPOT +2, AND CDUSPOT +4; ODD
|
|
# LOCATIONS NEED NOT BE ZEROED). TRG*NBSM DOES THE NB TO SM TRANSFOR-
|
|
# MATION; TRG*SMNB, VICE VERSA.
|
|
#
|
|
# CDU*NBSM DOES ITS TRANSFORMATION USING THE PRESENT CONTENTS OF
|
|
# THE CDU COUNTERS. OTHERWISE IT IS LIKE TRG*NBSM.
|
|
#
|
|
# CDU*SMNB IS THE COMPLEMENT OF CDU*NBSM.
|
|
|
|
CDU*SMNB EXIT
|
|
TC CDUTRIGS
|
|
TCF C*MM*N1
|
|
|
|
TRG*SMNB EXIT
|
|
TC CD*TR*GS
|
|
C*MM*N1 TC MPACVBUF # AX*SR*T EXPECTS VECTOR IN VBUF
|
|
CS THREE # SIGNAL FOR SM TO NB TRANSFORMATION
|
|
C*MM*N2 TC AX*SR*T
|
|
TC INTPRET
|
|
VLOAD RVQ
|
|
VBUF
|
|
|
|
CDU*NBSM EXIT
|
|
TC CDUTRIGS
|
|
TCF C*MM*N3
|
|
|
|
TRG*NBSM EXIT
|
|
TC CD*TR*GS
|
|
C*MM*N3 TC MPACVBUF # FOR AX*SR*T
|
|
CA THREE # SIGNAL FOR NB TO SM TRANSFORMATION
|
|
TCF C*MM*N2
|
|
|
|
# *NBSM* AND *SMNB* EXPECT TO SEE THE SINES AND COSINES (AT SINCDU
|
|
# AND COSCDU) RATHER THAN THE ANGLES THEMSELVES. OTHERWISE THEY ARE
|
|
# LIKE TRG*NBSM AND TRG*SMNB.
|
|
#
|
|
# NOTE THAT JUST AS CD*TR*GS NEED BE CALLED ONLY ONCE FOR EACH SERIES
|
|
# OF TRANSFORMATIONS USING THE SAME ANGLES, SO TOO ONLY ONE OF TRG*NBSM
|
|
# Page 1263
|
|
# AND TRG*SMNB NEED BE CALLED FOR EACH SERIES. FOR SUBSEQUENT TRANFOR-
|
|
# MATIONS USE *NBSM* AND *SMNB*.
|
|
|
|
*SMNB* EXIT
|
|
TCF C*MM*N1
|
|
|
|
*NBSM* EXIT
|
|
TCF C*MM*N3
|
|
|
|
# AX*SR*T COMBINES THE OLD SMNB AND NBSM. FOR THE NB TO SM
|
|
# TRANSFORMATION, ENTER WITH +3 IN A. FOR SM TO NB, ENTER WITH -3.
|
|
# THE VECTOR TO BE TRANSFORMED ARRIVES, AND IS RETURNED, IN VBUF.
|
|
# AX*SR*T EXPECTS TO FIND THE SINES AND COSINES OF THE ANGLES OF ROTATION
|
|
# AT SINCDU AND COSCDU, IN THE ORDER Y Z X. A CALL TO CD*TR*GS, WITH
|
|
# THE 2'S COMPLEMENT ANGLES (ORDER Y Z X) AT CDUSPOT, WILL TAKE CARE OF
|
|
# THIS. HERE IS A SAMPLE CALLING SEQUENCE:-
|
|
# TC CDUTRIGS
|
|
# CS THREE # ("CA THREE" FOR NBSM)
|
|
# TC AX*SR*T
|
|
# THE CALL TO CD*TR*GS NEED NOT BE REPEATED, WHEN AX*SR*T IS CALLED MORE
|
|
# THAN ONCE, UNLESS THE ANGLES HAVE CHANGED.
|
|
#
|
|
# AX*SR*T IS GUARANTEED SAFE ONLY FOR VECTORS OF MAGNITUDE LESS THAN
|
|
# UNITY. A LOOK AT THE CASE IN WHICH A VECTOR OF GREATER MAGNITUDE
|
|
# HAPPENS TO LIE ALONG AN AXIS OF THE SYSTEM TO WHICH IT IS TO BE TRANS-
|
|
# FORMED CONVINCES ONE THAT THIS IS A RESTRICTION WHICH MUST BE ACCEPTED.
|
|
|
|
AX*SR*T TS DEXDEX # WHERE IT BECOMES THE INDEX OF INDEXES
|
|
EXTEND
|
|
QXCH RTNSAVER
|
|
|
|
R*TL**P CCS DEXDEX # +3 --> 0 -3 --> 2
|
|
CS DEXDEX # THUS: +2 --> 1 -2 --> 1
|
|
AD THREE # +1 --> 2 -1 --> 0
|
|
EXTEND
|
|
INDEX A
|
|
DCA INDEXI
|
|
DXCH DEXI
|
|
|
|
CA ONE
|
|
TS BUF
|
|
EXTEND
|
|
INDEX DEX1
|
|
DCS VBUF
|
|
TCF LOOP1 # REALLY BE A SUBTRACT, AND VICE VERSA
|
|
|
|
LOOP2 DXCH BUF # LOADING VECTOR COMPONENT, STORING INDEX
|
|
# Page 1264
|
|
LOOP1 DXCH MPAC
|
|
CA SINSLOC
|
|
AD DEX1
|
|
TS ADDRWD
|
|
|
|
TC DMPSUB # MULTIPLY AT SIN(CDUANGLE)
|
|
CCS DEXDEX
|
|
DXCH MPAC # NBSM CASE
|
|
TCF +3
|
|
EXTEND # SMNB CASE
|
|
DCS MPAC
|
|
DXCH TERM1TMP
|
|
|
|
CA SIX # SINCDU AND COSCDU (EACH 6 WORDS) MUST
|
|
ADS ADDRWD # BE CONSECUTIVE AND IN THAT ORDER
|
|
|
|
EXTEND
|
|
INDEX BUF
|
|
INDEX DEX1
|
|
DCA VBUF
|
|
DXCH MPAC
|
|
TC DMPSUB # MULTIPLY BY COS(CDUANGLE)
|
|
DXCH MPAC
|
|
DAS TERM1TMP
|
|
DXCH TERM1TMP
|
|
DDOUBL
|
|
INDEX BUF
|
|
INDEX DEX1
|
|
DXCH VBUF
|
|
DXCH BUF # LOADING INDEX, STORING VECTOR COMPONENT
|
|
|
|
CCS A # 'CAUSE THAT'S WHERE THE INDEX NOW IS
|
|
TCF LOOP2
|
|
|
|
EXTEND
|
|
DIM DEXDEX # DECREMENT MAGNITUDE PRESERVING SIGN
|
|
|
|
TSTPOINT CCS DEXDEX # ONLY THE BRANCHING FUNCTION IS USED
|
|
TCF R*TL**P
|
|
TC RTNSAVER
|
|
TCF R*TL**P
|
|
TC RTNSAVER
|
|
|
|
SINSLOC ADRES SINCDU # FOR USE IN SETTING ADDRWD
|
|
|
|
INDEXI DEC 4 # ********** DON'T ***********
|
|
DEC 2 # ********** TOUCH ***********
|
|
DEC 0 # ********** THESE ***********
|
|
# Page 1265
|
|
DEC 4 # ********** CONSTANTS ***********
|
|
|
|
# ******************************************************************************
|
|
|
|
BANK 10
|
|
SETLOC FLESHLOC
|
|
BANK
|
|
COUNT* $$/POWFL
|
|
|
|
# ROUTINE FLESHPOT COMPUTES THE BODY-STABLE MEMBER TRANSFORMATION MATRIX (COMMONLY CALLED XNB) AND STORES
|
|
# IT IN THE LOCATIONS SPECIFIED BY THE ECADR ENTERING IN A.
|
|
|
|
CALCSMSC EXIT
|
|
TC BANKCALL
|
|
CADR FLESHPOT -1
|
|
TC INTPRET
|
|
RVQ
|
|
|
|
XNBECADR ECADR XNB
|
|
|
|
-1 CAF XNBECADR
|
|
|
|
FLESHPOT TS TEM2
|
|
XCH EBANK
|
|
XCH TEM2
|
|
MASK LOW8
|
|
AD OCT1400
|
|
TS TEM1
|
|
|
|
EXTEND
|
|
DCA COSCDUY
|
|
DXCH MPAC
|
|
TC DMP
|
|
ADRES COSCDUZ
|
|
DXCH MPAC
|
|
DDOUBL
|
|
INDEX TEM1
|
|
DXCH 0 # = COSY COSZ
|
|
|
|
EXTEND
|
|
DCA SINCDUZ
|
|
INDEX TEM1
|
|
DXCH 2 # = SINZ
|
|
|
|
EXTEND
|
|
DCS SINCDUY
|
|
DXCH MPAC
|
|
TC DMPSUB # ADDRWD SET TO COSCDUZ
|
|
# Page 1266
|
|
DXCH MPAC
|
|
DDOUBL
|
|
INDEX TEM1
|
|
DXCH 4 # = - SINY COSZ
|
|
|
|
EXTEND
|
|
DCS SINCDUX
|
|
DXCH MPAC
|
|
TC DMPSUB # ADDRWD SET TO COSCDUZ STILL
|
|
DXCH MPAC
|
|
DDOUBL
|
|
DXCH MPAC +3
|
|
|
|
EXTEND
|
|
DCS SINCDUX
|
|
DXCH MPAC
|
|
TC DMP
|
|
ADRES SINCDUZ
|
|
EXTEND
|
|
DCS MPAC
|
|
DXCH MPAC +5
|
|
TC DMP
|
|
ADRES SINCDUY
|
|
DXCH MPAC
|
|
DDOUBL
|
|
DDOUBL
|
|
DXCH MPAC +5
|
|
|
|
DXCH MPAC
|
|
TC DMP
|
|
ADRES COSCDUY
|
|
DXCH MPAC
|
|
DDOUBL
|
|
DDOUBL
|
|
DXCH BUF
|
|
|
|
EXTEND
|
|
DCA COSCDUY
|
|
DXCH MPAC
|
|
TC DMP
|
|
ADRES COSCDUX
|
|
DXCH MPAC
|
|
DDOUBL
|
|
DAS MPAC +5
|
|
|
|
EXTEND
|
|
DCA SINCDUY
|
|
DXCH MPAC
|
|
TC DMPSUB # ADDRWD SET TO COSCDUX
|
|
DXCH MPAC
|
|
|
|
# Page 1267
|
|
DDOUBL
|
|
DAS BUF
|
|
|
|
DXCH BUF
|
|
DXCH MPAC
|
|
|
|
EXTEND
|
|
DCA MPAC
|
|
INDEX TEM1
|
|
DXCH 14 # = SINY COSX + SINX SINZ COSY
|
|
|
|
EXTEND
|
|
DCA MPAC +3
|
|
INDEX TEM1
|
|
DXCH 16 # = - SINX COSZ
|
|
|
|
EXTEND
|
|
DCA MPAC +5
|
|
INDEX TEM1
|
|
DXCH 20 # = COSX COSY - SINX SINY SINZ
|
|
|
|
CA TEM1
|
|
TS ADDRWD
|
|
EXTEND
|
|
DCA Z
|
|
AD FOUR
|
|
DXCH LOC
|
|
CAF BIT8
|
|
TS EDOP
|
|
TCF VXV
|
|
DXCH MPAC
|
|
DDOUBL
|
|
INDEX TEM1
|
|
DXCH 6
|
|
|
|
DXCH MPAC +3
|
|
DDOUBL
|
|
INDEX TEM1
|
|
DXCH 10
|
|
|
|
DXCH MPAC +5
|
|
DDOUBL
|
|
INDEX TEM1
|
|
DXCH 12
|
|
|
|
CA TEM2
|
|
TS EBANK
|
|
TCF SWRETURN
|