551 lines
14 KiB
Plaintext
551 lines
14 KiB
Plaintext
# Copyright: Public domain.
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# Filename: WAITLIST.agc
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# Purpose: Part of the source code for Colossus 2A, AKA Comanche 055.
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# It is part of the source code for the Command Module's (CM)
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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: 1221-1235
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# Mod history: 2009-05-14 RSB Adapted from the Colossus249/ file of the
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# same name, using Comanche055 page images.
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#
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# This source code has been transcribed or otherwise adapted from digitized
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# images of a hardcopy from the MIT Museum. The digitization was performed
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# by Paul Fjeld, and arranged for by Deborah Douglas of the Museum. Many
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# thanks to both. The images (with suitable reduction in storage size and
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# consequent reduction in image quality as well) are available online at
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# www.ibiblio.org/apollo. If for some reason you find that the images are
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# illegible, contact me at info@sandroid.org about getting access to the
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# (much) higher-quality images which Paul 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 055 of AGC program Comanche by NASA
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# 2021113-051. 10:28 APR. 1, 1969
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#
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# This AGC program shall also be referred to as
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# Colossus 2A
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# Page 1221
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# PROGRAM DESCRIPTION DATE -- 10 OCTOBER 1966
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# MOD NO -- 2 LOG SECTION -- WAITLIST
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# MOD BY -- MILLER (DTMAX INCREASED TO 162.5 SEC) ASSEMBLY -- SUNBURST REV 5
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# MOD 3 BY KERNAN (INHINT INSERTED AT WAITLIST) 2/28/68 SKIPPER REV 4
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# MOD 4 BY KERNAN (TWIDDLE IN 54) 3/28/68 SKIPPER REV 13.
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#
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# FUNCTIONAL DESCRIPTION --
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# PART OF A SECTION OF PROGRAMS -- WAITLIST, TASKOVER, T3RUPT, USED TO CALL A PROGRAM (CALLED A TASK),
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# WHICH IS TO BEGIN IN C(A) CENTISECONDS. WAITLIST UPDATES TIME3, LST1, AND LST2. THE MEANING OF THESE LISTS
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# FOLLOW.
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#
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# C(TIME3) = 16384 -(T1-T) CENTISECONDS, (T=PRESENT TIME, T1-TIME FOR TASK1)
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#
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# C(LST1) = -(T2-T1)+1
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# C(LST1 +1) = -(T3-T2)+1
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# C(LST1 +2) = -(T4-T3)+1
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# ...
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# C(LST1 +6) = -(T8-T7)+1
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# C(LST1 +7) = -(T9-T8)+1
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#
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# C(LST2) = 2CADR OF TASK1
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# C(LST2 +2) = 2CADR OF TASK2
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# ...
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# C(LST2 +14) = 2CADR OF TASK8
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# C(LST2 +16) = 2CADR OF TASK9
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#
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# WARNINGS --
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# 1) 1 <= C(A) <= 16250D (1 CENTISECOND TO 162.5 SEC)
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# 2) 9 TASKS MAXIMUM
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# 3) TASKS CALLED UNDER INTERRUPT INHIBITED
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# 4) TASKS END BY TC TASKOVER
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#
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# CALLING SEQUENCE --
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# L-1 CA DELTAT (TIME IN CENTISECONDS TO TASK START)
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# L TC WAITLIST
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# L+1 2CADR DESIRED TASK
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# L+2 (MINOR OF 2CADR)
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# L+3 RELINT (RETURNS HERE)
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#
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# TWIDDLE --
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# TWIDDLE IS FOR USE WHEN THE TASK BEING SET UP IS IN THE SAME EBANK AND FBANK AS THE USER. IN
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# SUCH CASES, IT IMPROVES UPON WAITLIST BY ELIMINATING THE NEED FOR THE BBCON HALF OF THE 2CADR,
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# Page 1222
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# SAVING A WORD. TWIDDLE IS LIKE WAITLIST IN EVERY RESPECT EXCEPT CALLING SEQUENCE, TO WIT,
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# L-1 CA DELTAT
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# L TC TWIDDLE
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# L+1 ADRES DESIRED TASK
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# L+2 RELINT (RETURNS HERE)
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#
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# NORMAL EXIT MODES --
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# AT L+3 OF CALLING SEQUENCE.
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#
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# ALARM OR ABORT EXIT MODES --
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# TC ABORT
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# OCT 1203 (WAITLIST OVERFLOW -- TOO MANY TASKS)
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#
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# ERASABLE INITIALIZATION REQUIRED --
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# ACCOMPLISHED BY FRESH START -- LST2, ..., LST2 +16 = ENDTASK
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# LST1, ..., LST1 +7 = NEG1/2
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#
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# OUTPUT --
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# LST1 AND LST2 UPDATED WITH NEW TASK AND ASSOCIATED TIME.
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#
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# DEBRIS --
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# CENTRALS -- A,Q,L
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# OTHER -- WAITEXIT, WAITADR, WAITTEMP, WAITBANK
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#
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# DETAILED ANALYSIS OF TIMING --
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# CONTROL WILL NOT BE RETURNED TO THE SPECIFIED ADDRESS (2CADR) IN EXACTLY DELTA T CENTISECONDS.
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# THE APPROXIMATE TIME MAY BE CALCULATED AS FOLLOWS:
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# LET T0 = THE TIME OF THE TC WAITLIST
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# LET TS = T0 +147U + COUNTER INCREMENTS (SET UP TIME)
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# LET X = TS -(100TS)/100 (VARIANCE FROM COUNTERS)
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# LET Y = LENGTH OF TIME OF INHIBIT INTERRUPT AFTER T3RUPT
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# LET Z = LENGTH OF TIME TO PROCESS TASKS WHICH ARE DUE THIS T3RUPT BUT DISPATCHED EARLIER.
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# (Z=0, USUALLY).
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# LET DELTD = THE ACTUAL TIME TAKEN TO GIVE CONTROL TO 2CADR
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# THEN DELTD = TS+DELTA T -X +Y +Z +1.05MS* +COUNTERS*
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# *THE TIME TAKEN BY WAITLIST ITSELF AND THE COUNTER TICKING DURING THIS WAITLIST TIME.
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# IN SHORT, THE ACTUAL TIME TO RETURN CONTROL TO A 2CADR IS AUGMENTED BY THE TIME TO SET UP THE TASK'S
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# INTERRUPT, ALL COUNTERS TICKING, THE T3RUPT PROCESSING TIME, THE WAITLIST PROCESSING TIME AND THE POSSIBILITY
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# OF OTHER TASKS INHIBITING THE INTERRUPT.
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BLOCK 02
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# Page 1223
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EBANK= LST1 # TASK LISTS IN SWITCHED E BANK.
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COUNT 02/WAIT
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TWIDDLE INHINT
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TS L # SAVE DELAY TIME IN L
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CA POSMAX
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ADS Q # CREATING OVERFLOW AND Q-1 IN Q
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CA BBANK
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EXTEND
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ROR SUPERBNK
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XCH L
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WAITLIST INHINT
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EXTEND
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BZMF WATLST0-
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XCH Q # SAVE DELTA T IN Q AND RETURN IN
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TS WAITEXIT # WAITEXIT.
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EXTEND
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INDEX WAITEXIT # IF TWIDDLING, THE TS SKIPS TO HERE
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DCA 0 # PICK UP 2CADR OF TASK.
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-1 TS WAITADR # BBCON WILL REMAIN IN L
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DLY2 CAF WAITBB # ENTRY FROM FIXDELAY AND VARDELAY.
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XCH BBANK
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TCF WAIT2
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WATLST0- TC P00DOO
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OCT 1204 # WAITLIST CALL WITH ZERO OR NEG DT
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# RETURN TO CALLER AFTER TASK INSERTION:
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LVWTLIST DXCH WAITEXIT
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AD TWO
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DTCB
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EBANK= LST1
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WAITBB BBCON WAIT2
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# RETURN TO CALLER +2 AFTER WAITING DT SPECIFIED AT CALLER +1.
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FIXDELAY INDEX Q # BOTH ROUTINES MUST BE CALLED UNDER
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# Was CAF --- RSB 2004.
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CA 0 # WAITLIST CONTROL AND TERMINATE THE TASK
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INCR Q # IN WHICH THEY WERE CALLED.
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# RETURN TO CALLER +1 AFTER WAITING THE DT AS ARRIVING IN A.
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VARDELAY XCH Q # DT TO Q. TASK ADRES TO WAITADR.
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TS WAITADR
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CA BBANK # BBANK IS SAVED DURING DELAY.
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EXTEND
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# Page 1224
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ROR SUPERBNK # ADD SBANK TO BBCON.
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TS L
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CAF DELAYEX
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TS WAITEXIT # GO TO TASKOVER AFTER TASK ENTRY.
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TCF DLY2
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DELAYEX TCF TASKOVER -2 # RETURNS TO TASKOVER.
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# Page 1225
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# ENDTASK MUST ENTERED IN FIXED-FIXED SO IT IS DISTINGUISHABLE BY ITS ADRES ALONE.
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EBANK= LST1
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ENDTASK -2CADR SVCT3
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SVCT3 CCS FLAGWRD2 # DRIFT FLAG
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TCF TASKOVER
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TCF TASKOVER
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TCF +1
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CCS IMUCADR # DON'T DO NBDONLY IF SOMEONE ELSE IS IN
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TCF SVCT3X
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TCF +3
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TCF SVCT3X
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TCF SVCT3X
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+3 CAF PRIO35 # COMPENSATE FOR NBD COEFFICIENTS ONLY.
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TC NOVAC # ENABLE EVERY 81.93 SECONDS
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EBANK= NBDX
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2CADR NBDONLY
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TCF TASKOVER
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SETLOC FFTAG6
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BANK
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SVCT3X TC FIXDELAY # DELAY MAX OF 2 TIMES FOR IMU ZERO
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DEC 500
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TC SVCT3
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# Page 1226
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# BEGIN TASK INSERTION.
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BANK 01
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COUNT 01/WAIT
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WAIT2 TS WAITBANK # BBANK OF CALLING PROGRAM.
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CS TIME3
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AD BIT8 # BIT 8 = OCT 200
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CCS A # TEST 200 - C(TIME3). IF POSITIVE,
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# IT MEANS THAT TIME3 OVERFLOW HAS OCCURRED PRIOR TO CS TIME3 AND THAT
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# C(TIME3) = T - T1, INSTEAD OF 1.0 - (T1 - T). THE FOLLOWING FOUR
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# ORDERS SET C(A) = TD - T1 + 1 IN EITHER CASE.
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AD OCT40001 # OVERFLOW HAS OCCURRED. SET C(A) =
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CS A # T - T1 + 1.0 - 201
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# NORMAL CASE (C(A) NNZ) YIELDS SAME C(A): -( -(1.0-(T1-T)) + 200) - 1
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AD OCT40201
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AD Q # RESULT = TD - T1 + 1.
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CCS A # TEST TD - T1 +1.
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AD LST1 # IF TD - T1 POS, GO TO WTLST5 WITH
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TCF WTLST5 # C(A) = (TD - T1) + C(LST1) = TD-T2+1
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NOOP
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CS Q
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# NOTE THAT THIS PROGRAM SECTION IS NEVER ENTERED WHEN T-T1 G/E -1,
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# SINCE TD-T1+1 = (TD-T) + (T-T1+1), AND DELTA T = TD-T G/E +1. (G/E
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# SYMBOL MEANS GREATER THAN OR EQUAL TO). THUS THERE NEED BE NO CON-
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# CERN OVER A PREVIOUS OR IMMINENT OVERFLOW OF TIME3 HERE.
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AD POS1/2 # WHEN TD IS NEXT, FORM QUANTITY
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AD POS1/2 # 1.0 - DELTA T = 1.0 - (TD - T)
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XCH TIME3
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AD NEGMAX
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AD Q # 1.0 - DELTAT T NOW COMPLETE.
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EXTEND # ZERO INDEX Q.
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QXCH 7 # (ZQ)
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# Page 1227
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WTLST4 XCH LST1
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XCH LST1 +1
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XCH LST1 +2
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XCH LST1 +3
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XCH LST1 +4
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XCH LST1 +5
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XCH LST1 +6
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XCH LST1 +7
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CA WAITADR # (MINOR PART OF TASK CADR HAS BEEN IN L.)
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INDEX Q
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TCF +1
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DXCH LST2
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DXCH LST2 +2
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DXCH LST2 +4
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DXCH LST2 +6
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DXCH LST2 +8D
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DXCH LST2 +10D # AT END, CHECK THAT C(LST2 +10) IS STD
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DXCH LST2 +12D
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DXCH LST2 +14D
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DXCH LST2 +16D
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AD ENDTASK # END ITEM, AS CHECK FOR EXCEEDING
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# THE LENGTH OF THE LIST.
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EXTEND # DUMMY TASK ADRES SHOULD BE IN FIXED-
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BZF LVWTLIST # FIXED SO ITS ADRES ALONE DISTINGUISHES
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TCF WTABORT # IT.
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# Page 1228
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WTLST5 CCS A # TEST TD - T2 + 1
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AD LST1 +1
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TCF +4
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AD ONE
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TC WTLST2
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OCT 1
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+4 CCS A # TEST TD - T3 + 1
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AD LST1 +2
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TCF +4
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AD ONE
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TC WTLST2
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OCT 2
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+4 CCS A # TEST TD - T4 + 1
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AD LST1 +3
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TCF +4
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AD ONE
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TC WTLST2
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OCT 3
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+4 CCS A # TEST TD - T5 + 1
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AD LST1 +4
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TCF +4
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AD ONE
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TC WTLST2
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OCT 4
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+4 CCS A # TEST TD - T6 + 1
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AD LST1 +5
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TCF +4
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AD ONE
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TC WTLST2
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OCT 5
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+4 CCS A # TEST TD - T7 + 1
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AD LST1 +6
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TCF +4
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AD ONE
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TC WTLST2
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OCT 6
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# Page 1229
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+4 CCS A
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AD LST1 +7
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TCF +4
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AD ONE
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TC WTLST2
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OCT 7
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+4 CCS A
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WTABORT TC BAILOUT # NO ROOM IN THE INN
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OCT 1203
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AD ONE
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TC WTLST2
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OCT 10
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OCT40201 OCT 40201
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# Page 1230
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# THE ENTRY TC WTLST2 JUST PRECEDING OCT N IS FOR T LE TD LE T -1.
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# N N+1
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#
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# (LE MEANS LESS THAN OR EQUAL TO). AT ENTRY, C(A) = -(TD - T + 1)
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# N+1
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#
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# THE LST1 ENTRY-(T -T +1) IS TO BE REPLACED BY -(TD - T + 1), AND
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# N+1 N N
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#
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# THE ENTRY-(T - TD + 1) IS TO BE INSERTED IMMEDIATELY FOLLOWING.
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# N+1
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WTLST2 TS WAITTEMP # C(A) = -(TD - T + 1)
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INDEX Q
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# Was CAF --- RSB 2004.
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CA 0
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TS Q # INDEX VALUE INTO Q.
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CAF ONE
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AD WAITTEMP
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INDEX Q # C(A) = -(TD - T ) + 1.
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ADS LST1 -1 # N
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CS WAITTEMP
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INDEX Q
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TCF WTLST4
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# Page 1231
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# ENTERS HERE ON T3 RUPT TO DISPATCH WAITLISTED TASK.
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T3RUPT EXTEND
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ROR SUPERBNK # READ CURRENT SUPERBANK VALUE AND
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TS BANKRUPT # SAVE WITH E AND F BANK VALUES.
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EXTEND
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QXCH QRUPT
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T3RUPT2 CAF NEG1/2 # DISPATCH WAITLIST TASK.
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XCH LST1 +7
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XCH LST1 +6
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XCH LST1 +5
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XCH LST1 +4 # 1. MOVE UP LST1 CONTENTS, ENTERING
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XCH LST1 +3 # A VALUE OF 1/2 +1 AT THE BOTTOM
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XCH LST1 +2 # FOR T6-T5, CORRESPONDING TO THE
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XCH LST1 +1 # INTERVAL 81.91 SEC FOR ENDTASK.
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XCH LST1
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AD POSMAX # 2. SET T3 = 1.0 - T2 - T USING LIST 1.
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ADS TIME3 # SO T3 WON'T TICK DURING UPDATE.
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TS RUPTAGN
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CS ZERO
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TS RUPTAGN # SETS RUPTAGN TO +1 ON OVERFLOW.
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EXTEND # DISPATCH TASK.
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DCS ENDTASK
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DXCH LST2 +16D
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DXCH LST2 +14D
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DXCH LST2 +12D
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DXCH LST2 +10D
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DXCH LST2 +8D
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DXCH LST2 +6
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DXCH LST2 +4
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DXCH LST2 +2
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DXCH LST2
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XCH L
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EXTEND
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WRITE SUPERBNK # SET SUPERBANK FROM BBCON OF 2CADR
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XCH L # RESTORE TO L FOR DXCH Z.
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DTCB
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# Page 1232
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# RETURN, AFTER EXECUTION OF T3 OVERFLOW TASK:
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BLOCK 02
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COUNT 02/WAIT
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TASKOVER CCS RUPTAGN # IF +1 RETURN TO T3RUPT, IF -0 RESUME.
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CAF WAITBB
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TS BBANK
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TCF T3RUPT2 # DISPATCH NEXT TASK IF IT WAS DUE.
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CA BANKRUPT
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EXTEND
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WRITE SUPERBNK # RESTORE SUPERBANK BEFORE RESUME IS DONE
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RESUME EXTEND
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QXCH QRUPT
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NOQRSM CA BANKRUPT
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XCH BBANK
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NOQBRSM DXCH ARUPT
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RELINT
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RESUME
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# Page 1233
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# LONGCALL
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# PROGRAM DESCRIPTION DATE -- 17 MARCH 1967
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# PROGRAM WRITTEN BY W.H.VANDEVER LOG SECTION WAITLIST
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# MOD BY -- R. MELANSON TO ADD DOCUMENTATION ASSEMBLY SUNDISK REV. 100
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#
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# FUNCTIONAL DESCRIPTION --
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# LONGCALL IS CALLED WITH THE DELTA TIME ARRIVING IN A,L SCALED AS TIME2,TIME1 WITH THE 2CADR OF THE TASK
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# IMMEDIATELY FOLLOWING THE TC LONGCALL. FOR EXAMPLE, IT MIGHT BE DONE AS FOLLOWS WHERE TIMELOC IS THE NAME OF
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# A DP REGISTER CONTAINING A DELTA TIME AND WHERE TASKTODO IS THE NAME OF THE LOCATION AT WHICH LONGCALL IS TO
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# START.
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#
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# CALLING SEQUENCE --
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# EXTEND
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# DCA TIMELOC
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# TC LONGCALL
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# 2CADR TASKTODO
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#
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# NORMAL EXIT MODE --
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# 1) TC WAITLIST
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# 2) DTCB (TC L+3 OF CALLING ROUTINE 1ST PASS THRU LONGCYCL)
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# 3) DTCB (TO TASKOVER ON SUBSEQUENT PASSES THRU LONGCYCL)
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#
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# ALARM OR ABORT EXIT MODE --
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# NONE
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#
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# OUTPUT --
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# LONGTIME AND LONGTIME+1 = DELTA TIME
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# LONGEXIT AND LONGEXIT+1 = RETURN 2CADR
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# LONGCADR AND LONGCADR+1 = TASK 2CADR
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# A = SINGLE PRECISION TIME FOR WAITLIST
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#
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# ERASABLE INITIALIZATION --
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# A = MOST SIGNIFICANT PART OF DELTA TIME
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# L = LEAST SIGNIFICANT PART OF DELTA TIME
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# Q = ADDRESS OF 2CADR TASK VALUE
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#
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# DEBRIS --
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# A,Q,L
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# LONGCADR AND LONGCADR+1
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# LONGEXIT AND LONGEXIT+1
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# LONGTIME AND LONGTIME+1
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#
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# *** THE FOLLOWING IS TO BE IN FIXED-FIXED AND UNSWITCHED ERRASIBLE ***
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BLOCK 02
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EBANK= LST1
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LONGCALL DXCH LONGTIME # OBTAIN THE DELTA TIME
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EXTEND # OBTAIN THE 2CADR
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# Page 1234
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NDX Q
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DCA 0
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DXCH LONGCADR
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EXTEND # NO GO TO THE APPROPRIATE SWITCHED BANK
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DCA LGCL2CDR # FOR THE REST OF LONGCALL
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DTCB
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EBANK= LST1
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LGCL2CDR 2CADR LNGCALL2
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# *** THE FOLLOWING MAY BE IN A SWITCHED BANK, INCLUDING ITS ERASABLE ***
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BANK 01
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COUNT 01/WAIT
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LNGCALL2 LXCH LONGEXIT +1 # SAVE THE CORRECT BB FOR RETURN
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CA TWO # OBTAIN THE RETURN ADDRESS
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ADS Q
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TS LONGEXIT
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# *** WAITLIST TASK LONGCYCL ***
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LONGCYCL EXTEND # CAN WE SUCCESFULLY TAKE ABOUT 1.25
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DCS DPBIT14 # MINUTES OFF OF LONGTIME
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DAS LONGTIME
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CCS LONGTIME +1 # THE REASONING BEHIND THIS PART IS
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TCF MUCHTIME # INVOLVED, TAKING INTO ACCOUNT THAT THE
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# WORDS MAY NOT BE SIGNED CORRECTED (DP
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# BASIC INSTRUCTIONS
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# DO NOT SIGN CORRECT) AND THAT WE SUBTRAC-
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# TED BIT14 (1 OVER HALF THE POS. VALUE
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# REPRESENTABLE IN SINGLE WORD)
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NOOP # CAN'T GET HERE *************
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TCF +1
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CCS LONGTIME
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TCF MUCHTIME
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DPBIT14 OCT 00000
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OCT 20000
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# LONGCALL
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LASTTIME CA BIT14 # GET BACK THE CORRECT DELTA TFOR WAITLIST
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ADS LONGTIME +1
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TC WAITLIST
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EBANK= LST1
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2CADR GETCADR # THE ENTRY TO OUR LONGCADR
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LONGRTRN CA TSKOVCDR # SET IT UP SO THAT ONLY THE FIRST EXIT IS
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# Page 1235
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DXCH LONGEXIT # TO THE CALLER OF LONGCALL
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DTCB # THE REST ARE TO TASKOVER
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MUCHTIME CA BIT14 # WE HAVE OVER OUR ABOUT 1.25 MINUTES
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TC WAITLIST # SO SET UP FOR ANOTHER CYCLE THROUGH HERE
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EBANK= LST1
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2CADR LONGCYCL
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TCF LONGRTRN # NOW EXIT PROPERLY
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# *** WAITLIST TASK GETCADR ***
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GETCADR DXCH LONGCADR # GET THE LONGCALL THAT WE WISHED TO START
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DTCB # AND TRANSFER CONTROL TO IT
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TSKOVCDR GENADR TASKOVER
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