swh:1:snp:cac5fb5e02e08ee7616a46f7bfbaeee022e40e15
Tip revision: 62edbcc8c6021789df156749d71229308ba4313a authored by Ronald Burkey on 08 August 2021, 00:25:00 UTC
Merge pull request #1149 from virtualagc/yagcb1_fixes
Merge pull request #1149 from virtualagc/yagcb1_fixes
Tip revision: 62edbcc
RADAR_LEADIN_ROUTINES.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: RADAR_LEADIN_ROUTINES.agc
## Purpose: A section of Luminary revision 163.
## It is part of the reconstructed source code for the first
## (unflown) release of the flight software for the Lunar
## Module's (LM) Apollo Guidance Computer (AGC) for Apollo 14.
## The code has been recreated from a reconstructed copy of
## Luminary 173, as well as Luminary memos 157 amd 158.
## It has been adapted such that the resulting bugger words
## exactly match those specified for Luminary 163 in NASA
## drawing 2021152N, which gives relatively high confidence
## that the reconstruction is correct.
## Reference: pp. 498-499
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo/index.html
## Mod history: 2019-08-21 MAS Created from Luminary 173. Moved RADSAMP back
## to bank 25. Changed the TWIDDLE to RADSAMP to
## a WAITLIST call.
## Page 498
BANK 25
SETLOC RRLEADIN
BANK
EBANK= RSTACK
# RADAR SAMPLING LOOP.
COUNT* $$/RLEAD
RADSAMP CCS RSAMPDT # TIMES NORMAL ONCE-PER-SECOND SAMPLING.
TCF +2
TCF TASKOVER # +0 INSERTED MANUALLY TERMINATES TEST.
TC WAITLIST
EBANK= RSTACK
2CADR RADSAMP
CAF PRIO25
TC NOVAC
EBANK= RSTACK
2CADR DORSAMP
CAF BIT14 # FOR CYCLIC SAMPLING, RTSTDEX=
EXTEND # RTSTLOC/2 + RTSTBASE
MP RTSTLOC
AD RTSTBASE # 0 FOR RR, 2 FOR LR.
TS RTSTDEX
TCF TASKOVER
# DO THE ACTUAL RADAR SAMPLE.
DORSAMP TC VARADAR # SELECTS VARIABLE RADAR CHANNEL.
TC BANKCALL
CADR RADSTALL
INCR RFAILCNT # ADVANCE FAIL COUNTER BUT ACCEPT BAD DATA
DORSAMP2 INHINT
CA FLAGWRD5 # DON'T UPDATE RSTACK IF IN R77.
MASK R77FLBIT
CCS A
TCF R77IN
DXCH SAMPLSUM
INDEX RTSTLOC
DXCH RSTACK
## Page 499
CA RADMODES
EXTEND
RXOR CHAN33
MASK BIT6
EXTEND
BZF R77IN
TC ALARM
OCT 522
INCR RFAILCNT
R77IN CS RTSTLOC # CYCLE RTSTLOC
AD RTSTMAX
EXTEND
BZF +3
CA RTSTLOC
AD TWO # STORAGE IS DP
TS RTSTLOC
TCF ENDOFJOB # CONTINUOUS SAMPLING AND 2N TRIES - GONE.
# VARIABLE RADAR DATA CALLER FOR ONE MEASUREMENT ONLY.
VARADAR CAF ONE # WILL BE SENT TO RADAR ROUTINE IN A BY
TS BUF2 # SWCALL.
INDEX RTSTDEX
CAF RDRLOCS
TCF SWCALL # NOT TOUCHING Q.
RDRLOCS CADR RRRANGE # = 0
CADR RRRDOT # = 1
CADR LRVELX # = 2
CADR LRVELY # = 3
CADR LRVELZ # = 4
CADR LRALT # = 5