### FILE="Main.annotation"
## Copyright:   Public domain.
## Filename:    KEYRUPT,_UPRUPT.agc
## Purpose:     A section of Luminary revision 173.
##              It is part of the reconstructed source code for the second
##              (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 178, as well as Luminary memo 167 (revision 1).
##              It has been adapted such that the resulting bugger words
##              exactly match those specified for Luminary 173 in NASA
##              drawing 2021152N, which gives relatively high confidence
##              that the reconstruction is correct.
## Reference:   pp. 1327-1329
## Assembler:   yaYUL
## Contact:     Ron Burkey <info@sandroid.org>.
## Website:     www.ibiblio.org/apollo/index.html
## Mod history: 2019-09-18 MAS  Created from Luminary 178.

## Page 1327
                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 1328
# 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
                CA      FLAGWRD3        # AFTER EARTH LAUNCH?
                MASK    NOP07BIT
                CCS     A
                TCF     UPRPT1          # YES
                CA      KEYTEMP1        # NO: SUM UPLINK DATA
                ADS     UPSUM
                INCR    UPSUM +1      
UPRPT1          CAF     BIT3            # TURN ON UPACT LIGHT
                EXTEND                  # (BIT 3 OF CHANNEL 11)
                WOR     DSALMOUT
                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

UPOK            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
## Page 1329
                                        # 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
                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.