Apollo-11/Luminary099/RESTARTS_ROUTINE.agc

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# Copyright: Public domain.
# Filename: RESTARTS_ROUTINE.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: Onno Hommes <ohommes@cmu.edu>.
# Website: www.ibiblio.org/apollo.
# Pages: 1303-1309
# Mod history: 2009-05-27 OH Transcribed from page images.
#
# 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 2021112-61
# 16:27 JULY 14, 1969
# Page 1303
BANK 01
SETLOC RESTART
BANK
EBANK= PHSNAME1 # GOPROG MUST SWITCH TO THIS EBANK
COUNT* $$/RSROU
RESTARTS CA MPAC +5 # GET GROUP NUMBER -1
DOUBLE # SAVE FOR INDEXING
TS TEMP2G
CA PHS2CADR # SET UP EXIT IN CASE IT IS AN EVEN
TS TEMPSWCH # TABLE PHASE
CA RTRNCADR # TO SAVE TIME ASSUME IT WILL GET NEXT
TS GOLOC +2 # GROUP AFTER THIS
CA TEMPPHS
MASK OCT1400
CCS A # IS IT A VARIABLE OR TABLE RESTART
TCF ITSAVAR # IT'S A VARIABLE RESTART
GETPART2 CCS TEMPPHS # IS IT AN X.1 RESTART
CCS A
TCF ITSATBL # NO, IT'S A TABLE RESTART
CA PRIO14 # IT IS AN X.1 RESTART, THEREFORE START
TC FINDVAC # THE DISPLAY RESTART JOB
EBANK= LST1
2CADR INITDSP
TC RTRNCADR # FINISHED WITH THIS GROUP, GET NEXT ONE
ITSAVAR MASK OCT1400 # IS IT TYPE B ?
CCS A
TCF ITSLIKEB # YES, IT IS TYPE B
EXTEND # STORES THE JOB (OR TASK) 2CADR FOR EXIT
NDX TEMP2G
DCA PHSNAME1
DXCH GOLOC
CA TEMPPHS # SEE IF THIS IS A JOB, TASK, OR A LONGCALL
MASK OCT7
AD MINUS2
CCS A
TCF ITSLNGCL # IT'S A LONGCALL
RTRNCADR TC SWRETURN # CAN'T GET HERE.
# Page 1304
TCF ITSAWAIT
TCF ITSAJOB # IT'S A JOB
ITSAWAIT CA WTLTCADR # SET UP WAITLIST CALL
TS GOLOC -1
NDX TEMP2G # DIRECTLY STORED
CA PHSPRDT1
TIMETEST CCS A # IS IT AN IMMEDIATE RESTART
INCR A # NO.
TCF FINDTIME # FIND OUT WHEN IT SHOULD BEGIN
TCF ITSINDIR # STORED INDIRECTLY
TCF IMEDIATE # IT WANTS AN IMMEDIATE RESTART
# ***** THIS MUST BE IN FIXED FIXED *****
BLOCK 02
SETLOC FFTAG2
BANK
COUNT* $$/RSROU
ITSINDIR LXCH GOLOC +1 # GET THE CORRECT E BANK IN CASE THIS IS
LXCH BB # SWITCHED ERASABLE
NDX A # GET THE TIME INDIRECTLY
CA 1
LXCH BB # RESTORE THE BB AND GOLOC
LXCH GOLOC +1
TCF FINDTIME # FIND OUT WHEN IT SHOULD BEGIN
# ***** YOU MAY RETURN TO SWITCHED FIXED *****
BANK 01
SETLOC RESTART
BANK
COUNT* $$/RSROU
FINDTIME COM # MAKE NEGATIVE SINCE IT WILL BE SUBTRACTED
TS L # AND SAVE
NDX TEMP2G
CS TBASE1
EXTEND
SU TIME1
CCS A
COM
# Page 1305
AD OCT37776
AD ONE
AD L
CCS A
CA ZERO
TCF +2
TCF +1
IMEDIATE AD ONE
TC GOLOC -1
ITSLIKEB CA RTRNCADR # TYPE B, SO STORE RETURN IN
TS TEMPSWCH # TEMPSWCH IN CASE OF AN EVEN PHASE
CA PRT2CADR # SET UP EXIT TO GET TABLE PART OF THIS
TS GOLOC +2 # VARIABLE TYPE OF PHASE
CA TEMPPHS # MAKE THE PHASE LOOK RIGHT FOR THE TABLE
MASK OCT177 # PART OF THIS VARIABLE PHASE
TS TEMPPHS
EXTEND
NDX TEMP2G # OBTAIN THE JOB'S 2CADR
DCA PHSNAME1
DXCH GOLOC
ITSAJOB NDX TEMP2G # NOW ADD THE PRIORITY AND LET'S GO
CA PHSPRDT1
CHKNOVAC TS GOLOC -1 # SAVE PRIO UNTIL WE SEE IF IT'S
EXTEND # A FINDVAC OR A NOVAC
BZMF ITSNOVAC
CAF FVACCADR # POSITIVE, SET UP FINDVAC CALL.
XCH GOLOC -1 # PICK UP PRIO
TC GOLOC -1 # AND GO
ITSNOVAC CAF NOVACADR # NEGATIVE,
XCH GOLOC -1 # SET UP NOVAC CALL,
COM # CORRECT PRIO,
TC GOLOC -1 # AND GO
ITSATBL TS CYR # FIND OUT IF THE PHASE IS ODD OR EVEN
CCS CYR
TCF +1 # IT'S EVEN
TCF ITSEVEN
CA RTRNCADR # IN CASE THIS IS THE SECOND PART OF A
TS GOLOC +2 # TYPE B RESTART, WE NEED PROPER EXIT
CA TEMPPHS # SET UP POINTER FOR FINDING OUR PLACE IN
TS SR # THE RESTART TABLES
AD SR
# Page 1306
NDX TEMP2G
AD SIZETAB +1
TS POINTER
CONTBL2 EXTEND # FIND OUT WHAT'S IN THE TABLE
NDX POINTER
DCA CADRTAB # GET THE 2CADR
LXCH GOLOC +1 # STORE THE BB INFORMATION
CCS A # IS IT A JOB OR IT IT TIMED
INCR A # POSITIVE, MUST BE A JOB
TCF ITSAJOB2
INCR A # MUST BE EITHER A WAITLIST OR LONGCALL
TS GOLOC # LET'S STORE THE CORRECT CADR
CA WTLTCADR # SET UP OUR EXIT TO WAITLIST
TS GOLOC -1
CA GOLOC +1 # NOW FIND OUT IF IT IS A WAITLIST CALL
MASK BIT10 # THIS SHOULD BE ONE IF WE HAVE -BB
CCS A # FOR THAT MATTER SO SHOULD BE BITS 9,8,7,
# 6,5, AND LAST BUT NOT LEAST (PERHAPS NOT
# IN IMPORTANCE ANYWAY. BIT 4
TCF ITSWTLST # IT IS A WAITLIST CALL
NDX POINTER # OBTAIN THE ORIGINAL DELTA T
CA PRDTTAB # ADDRESS FOR THIS LONGCALL
TCF ITSLGCL1 # NOW GO GET THE DELTA TIME
# ***** THIS MUST BE IN FIXED FIXED *****
BLOCK 02
SETLOC FFTAG2
BANK
COUNT* $$/RSROU
ITSLGCL1 LXCH GOLOC +1 # OBTAIN THE CORRECT E BANK
LXCH BB
LXCH GOLOC +1 # AND PRESERVE OUR E AND F BANKS
EXTEND # GET THE DELTA TIME
NDX A
DCA 0
LXCH GOLOC +1 # RESTORE OUR E AND F BANK
LXCH BB # RESTORE THE TASKS E AND F BANKS
LXCH GOLOC +1 # AND PRESERVE OUR L
# Page 1307
TCF ITSLGCL2 # NOT LET'S PROCESS THIS LONGCALL
# ***** YOU MAY RETURN TO SWITCHED FIXED *****
BANK 01
SETLOC RESTART
BANK
COUNT* $$/RSROU
ITSLGCL2 DXCH LONGTIME
EXTEND # CALCULATE TIME LEFT
DCS TIME2
DAS LONGTIME
EXTEND
DCA LONGBASE
DAS LONGTIME
CCS LONGTIME # FIND OUT HOW THIS SHOULD BE RESTARTED
TCF LONGCLCL
TCF +2
TCF IMEDIATE -3
CCS LONGTIME +1
TCF LONGCLCL
NOOP # CAN'T GET HERE ************
TCF IMEDIATE -3
TCF IMEDIATE
LONGCLCL CA LGCLCADR # WE WILL GO TO LONGCALL
TS GOLOC -1
EXTEND # PREPARE OUR ENTRY TO LONGCALL
DCA LONGTIME
TC GOLOC -1
ITSLNGCL CA WTLTCADR # ASSUME IT WILL GO TO WAITLIST
TS GOLOC -1
NDX TEMP2G
CS PHSPRDT1 # GET THE DELTA T ADDRESS
TCF ITSLGCL1 # NOW GET THE DELTA TIME
ITSWTLST CS GOLOC +1 # CORRECT THE BBCON INFORMATION
TS GOLOC +1
NDX POINTER # GET THE DT AND FIND OUT IF IT WAS STORED
CA PRDTTAB # DIRECTOY OR INDIRECTLY
TCF TIMETEST # FIND OUT HOW THE TIME IS STORED
# Page 1308
ITSAJOB2 XCH GOLOC # STORE THE CADR
NDX POINTER # ADD THE PRIORITY AND LET'S GO
CA PRDTTAB
TCF CHKNOVAC
ITSEVEN CA TEMPSWCH # SET FOR EITHER THE SECOND PART OF THE
TS GOLOC +2 # TABLE, OR A RETURN FOR THE NEXT GROUP
NDX TEMP2G # SET UP POINTER FOR OUR LOCATION WITHIN
CA SIZETAB # THE TABLE
AD TEMPPHS # THIS MAY LOOK BAD BUT LET'S SEE YOU DO
AD TEMPPHS # BETTER IN TIME OR NUMBER OF LOCATIONS
AD TEMPPHS
TS POINTER
TCF CONTBL2 # NO PROCESS WHAT IS IN THE TABLE
PHSPART2 CA THREE # SET THE POINTER FOR THE SECOND HALF OF
ADS POINTER # THE TABLE
CA RTRNCADR # THIS WILL BE OUR LAST TIME THROUGH THE
TS GOLOC +2 # EVEN TABLE, SO AFTER IT GET THE NEXT
# GROUP
TCF CONTBL2 # SO LET'S GET THE SECOND ENTRY IN THE TBL
TEMPPHS EQUALS MPAC
TEMP2G EQUALS MPAC +1
POINTER EQUALS MPAC +2
TEMPSWCH EQUALS MPAC +3
GOLOC EQUALS VAC5 +20D
MINUS2 EQUALS NEG2
OCT177 EQUALS LOW7
PHS2CADR GENADR PHSPART2
PRT2CADR GENADR GETPART2
LGCLCADR GENADR LONGCALL
FVACCADR GENADR FINDVAC
WTLTCADR GENADR WAITLIST
NOVACADR GENADR NOVAC