KEYRUPT,_UPRUPT.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: KEYRUPT,_UPRUPT.agc
## Purpose: A section of Luminary revision 116.
## It is part of the source code for the Lunar Module's (LM)
## Apollo Guidance Computer (AGC) for Apollo 12.
## This file is intended to be a faithful transcription, except
## that the code format has been changed to conform to the
## requirements of the yaYUL assembler rather than the
## original YUL assembler.
## Reference: pp. 1328-1330
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo/index.html
## Mod history: 2017-01-22 MAS Created from Luminary 99.
## 2017-02-03 RRB Updated for Luminary 116.
## 2017-03-13 RSB Proofed comment text via 3-way diff vs
## Luminary 99 and 131.
## Page 1328
BANK 14
SETLOC KEYRUPT
BANK
COUNT* $$/KEYUP
KEYRUPT1 TS BANKRUPT
XCH Q
TS QRUPT
TC LODSAMPT # TIME IS SNATCHED IN RUPT FOR NOUN 65.
CAF LOW5
EXTEND
RAND MNKEYIN # CHECK IF KEYS 5M-1M ON
KEYCOM TS RUPTREG4
CS FLAGWRD5
MASK DSKYFBIT
ADS FLAGWRD5
ACCEPTUP CAF CHRPRIO # (NOTE: RUPTREG4 = KEYTEMP1)
TC NOVAC
EBANK= DSPCOUNT
2CADR CHARIN
CA RUPTREG4
INDEX LOCCTR
TS MPAC # LEAVE 5 BIT KEY CDE IN MPAC FOR CHARIN
TC RESUME
## Page 1329
# UPRUPT PROGRAM
UPRUPT TS BANKRUPT
XCH Q
TS QRUPT
TC LODSAMPT # TIME IS SNATCHED IN RUPT FOR NOUN 65.
CAF ZERO
XCH INLINK
TS KEYTEMP1
CAF BIT3 # TURN ON UPACT LIGHT
EXTEND # (BIT 3 OF CHANNEL 11)
WOR DSALMOUT
UPRPT1 CAF LOW5 # TEST FOR TRIPLE CHAR REDUNDANCY
MASK KEYTEMP1 # LOW5 OF WORD
XCH KEYTEMP1 # LOW5 INTO KEYTEMP1
EXTEND
MP BIT10 # SHIFT RIGHT 5
TS KEYTEMP2
MASK LOW5 # MID 5
AD HI10
TC UPTEST
CAF BIT10
EXTEND
MP KEYTEMP2 # SHIFT RIGHT 5
MASK LOW5 # HIGH 5
COM
TC UPTEST
UPCK CS ELRCODE # CODE IS GOOD. IF CODE = 'ERROR RESET',
AD KEYTEMP1 # CLEAR UPLOCKFL(SET BIT4 OF FLAGWRD7 = 0)
EXTEND # IF CODE DOES NOT = 'ERROR RESET', ACCEPT
BZF CLUPLOCK # CODE ONLY IF UPLOCKFL IS CLEAR (=0).
CAF UPLOCBIT # TEST UPLOCKFL FOR 0 OR 1
MASK FLAGWRD7
CCS A
TC RESUME # UPLOCKFL = 1
TC ACCEPTUP # UPLOCKFL = 0
CLUPLOCK CS UPLOCBIT # CLEAR UPLOCKFL (I.E., SET BIT 4 OF )
MASK FLAGWRD7 # FLAGWRD7 = 0)
TS FLAGWRD7
TC ACCEPTUP
# CODE IS BAD
TMFAIL2 CS FLAGWRD7 # LOCK OUT FURTHER UPLINK ACTIVITY
MASK UPLOCBIT # (BY SETTING UPLOCKFL = 1) UNTIL
ADS FLAGWRD7 # 'ERROR RESET' IS SENT VIA UPLINK.
TC RESUME
UPTEST AD KEYTEMP1
## Page 1330
CCS A
TC TMFAIL2
HI10 OCT 77740
TC TMFAIL2
TC Q
ELRCODE OCT 22
# 'UPLINK ACTIVITY LIGHT' IS TURNED OFF BY .....
# 1. VBRELDSP
# 2. ERROR RESET
# 3. UPDATE PROGRAM (P27) ENTERED BY V70,V71,V72, AND V73.
# -
# THE RECEPTION OF A BAD CODE (I.E CCC FAILURE) LOCKS OUT FURTHER UPLINK ACTIVITY BY SETTING BIT4 OF FLAGWRD7 = 1.
# THIS INDICATION WILL BE TRANSFERRED TO THE GROUND BY THE DOWNLINK WHICH DOWNLINKS ALL FLAGWORDS.
# WHEN UPLINK ACTIVITY IS LOCKED OUT, IT CAN BE ALLOWED WHEN THE GROUND UPLINKS AND 'ERROR RESET' CODE.
# (IT IS RECOMMENDED THAT THE 'ERROR LIGHT RESET' CODE IS PRECEEDED BY 16 BITS THE FIRST OF WHICH IS 1 FOLLOWED
# BY 15 ZEROES. THIS WILL ELIMINATE EXTRANEOUS BITS FROM INLINK WHICH MAY HAVE BEEN LEFT OVER FROM THE ORIGINAL
# FAILURE)
# UPLINK ACTIVITY IS ALSO ALLOWED (UNLOCKED) DURING FRESH START WHEN FRESH START SETS BIT4 OF FLAGWRD7 = 0.
