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164 lines
4.4 KiB
Plaintext
164 lines
4.4 KiB
Plaintext
# Copyright: Public domain.
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# Filename: T6-RUPT_PROGRAMS.agc
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# Purpose: Part of the source code for Luminary 1A build 099.
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# It is part of the source code for the Lunar Module's (LM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 1403-1405
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# Mod history: 2009-05-10 SN (Sergio Navarro). Started adapting
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# from the Luminary131/ file of the same
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# name, using Luminary099 page images.
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#
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# This source code has been transcribed or otherwise adapted from
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# digitized images of a hardcopy from the MIT Museum. The digitization
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# was performed by Paul Fjeld, and arranged for by Deborah Douglas of
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# the Museum. Many thanks to both. The images (with suitable reduction
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# in storage size and consequent reduction in image quality as well) are
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# available online at www.ibiblio.org/apollo. If for some reason you
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# find that the images are illegible, contact me at info@sandroid.org
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# about getting access to the (much) higher-quality images which Paul
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# actually created.
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#
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# Notations on the hardcopy document read, in part:
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#
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# Assemble revision 001 of AGC program LMY99 by NASA 2021112-061
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# 16:27 JULY 14, 1969
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# Page 1403
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# PROGRAM NAMES: (1) T6JOBCHK MOD. NO. 5 OCTOBER 2, 1967
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# (2) DOT6RUPT
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# MODIFICATION BY: LOWELL G. HULL (A.C.ELECTRONICS)
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#
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# THESE PROGRAMS ENABLE THE LM DAP TO CONTROL THE THRUST TIMES OF THE REACTION CONTROL SYSTEM JETS BY USING TIME6.
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# SINCE THE LM DAP MAINTAINS EXCLUSIVE CONTROL OVER TIME6 AND ITS INTERRUPTS, THE FOLLOWING CONVENTIONS HAVE BEEN
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# ESTABLISHED AND MUST NOT BE TAMPERED WITH:
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# 1. NO NUMBER IS EVER PLACED INTO TIME6 EXCEPT BY LM DAP.
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# 2. NO PROGRAM OTHER THAN LM DAP ENABLES THE TIME6 COUNTER.
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# 3. TO USE TIME6, THE FOLLOWING SEQUENCE IS ALWAYS EMPLOYED:
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# A. A POSITIVE (NON-ZERO) NUMBER IS STORED IN TIME6.
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# B. THE TIME6 CLOCK IS ENABLED.
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# C. TIME6 IS INTERROGATED AND IS:
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# I. NEVER FOUND NEGATIVE (NON-ZERO) OR +0.
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# II. SOMETIMES FOUND POSITIVE (BETWEEN 1 AND 240D) INDICATING THAT IT IS ACTIVE.
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# III. SOMETIMES FOUND POSMAX INDICATING THAT IT IS INACTIVE AND NOT ENABLED.
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# IV. SOMETIMES FOUND NEGATIVE ZERO INDICATING THAT:
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# A. A T6RUPT IS ABOUT TO OCCUR AT THE NEXT DINC, OR
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# B. A T6RUPT IS WAITING IN THE PRIORITY CHAIN, OR
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# C. A T6RUPT IS IN PROCESS NOW.
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# 4. ALL PROGRAMS WHICH OPERATE IN EITHER INTERRUPT MODE OR WITH INTERRUPT INHIBITED MUST CALL T6JOBCHK
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# EVERY 5 MILLISECONDS TO PROCESS A POSSIBLE WAITING T6RUPT BEFORE IT CAN BE HONORED BY THE HARDWARE.
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# (5. PROGRAM JTLST, IN Q,R-AXES, HANDLES THE INPUT LIST.)
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#
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# T6JOBCHK CALLING SEQUENCE:
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# L TC T6JOBCHK
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# L+1 (RETURN)
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#
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# DOT6RUPT CALLING SEQUENCE:
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# DXCH ARUPT # T6RUPT LEAD IN AT LOCATION 4004.
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# EXTEND
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# DCA T6ADR
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# DTCB
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#
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# SUBROUTINES CALLED: DOT6RUPT CALLS T6JOBCHK.
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#
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# NORMAL EXIT MODES: T6JOBCHK RETURNS TO L +1.
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# DOT6RUPT TRANSFERS CONTROL TO RESUME.
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#
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# ALARM/ABORT MODES: NONE.
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#
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# INPUT: TIME6 NXT6ADR OUTPUT: TIME6 NXT6ADR CHANNEL 5
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# T6NEXT T6NEXT +1 T6NEXT T6NEXT +1 CHANNEL 6
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# T6FURTHA T6FURTHA +1 T6FURTHA T6FURTHA +1 BIT15/CH13
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#
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# DEBRIS: T6JOBCHK CLOBBERS A. DOT6RUPT CLOBBERS NOTHING.
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BLOCK 02
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# Page 1404
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BANK 17
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SETLOC DAPS2
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BANK
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EBANK= T6NEXT
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COUNT* $$/DAPT6
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T6JOBCHK CCS TIME6 # CHECK TIME6 FOR WAITING T6RUPT:
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TC Q # NONE: CLOCK COUNTING DOWN.
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TC CCSHOLE
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TC T6JOBCHK +3
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# CONTROL PASSES TO T6JOB ONLY WHEN C(TIME6) = -0 (I.E., WHEN A T6RUPT MUST BE PROCESSED).
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T6JOB CAF POSMAX # DISABLE CLOCK: NEEDED SINCE RUPT OCCURS
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EXTEND # 1 DINC AFTER T6 = 77777. FOR 625 MUSECS
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WAND CHAN13 # MUST NOT HAVE T6 = +0 WITH ENABLE SET
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CA POSMAX
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ZL
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DXCH T6FURTHA
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DXCH T6NEXT
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LXCH NXT6ADR
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TS TIME6
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AD PRIO37
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TS A
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TCF ENABLET6
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CA POSMAX
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TS TIME6
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TCF GOCH56
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ENABLET6 CA BIT15
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EXTEND
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WOR CHAN13
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CA T6NEXT
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AD PRIO37
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TS A
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TCF GOCH56
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CA POSMAX
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TS T6NEXT
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GOCH56 INDEX L
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TCF WRITEP -1
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BLOCK 02
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SETLOC FFTAG9
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BANK
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EBANK= CDUXD
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COUNT* $$/DAPT6
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CA NEXTP
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WRITEP EXTEND
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WRITE CHAN6
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# Page 1405
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TC Q
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CA NEXTU
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WRITEU TS L
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CS 00314OCT
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EXTEND
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RAND CHAN5
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AD L
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EXTEND
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WRITE CHAN5
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TC Q
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CA NEXTV
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WRITEV TS L
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CA 00314OCT
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TCF -9D
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00314OCT OCT 00314
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BANK 17
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SETLOC DAPS2
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BANK
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EBANK= T6NEXT
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COUNT* $$/DAPT6
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DOT6RUPT LXCH BANKRUPT # (INTERRUPT LEAD INS CONTINUED)
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EXTEND
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QXCH QRUPT
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TC T6JOBCHK # CALL T6JOBCHK.
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TCF RESUME # END TIME6 INTERRUPT PROCESSOR.
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