246 lines
6.7 KiB
Plaintext
246 lines
6.7 KiB
Plaintext
# Copyright: Public domain.
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# Filename: TVCMASSPROP.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: 951-955
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# Mod history: 2009-05-13 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 951
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# PROGRAM NAME....MASSPROP
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# LOG SECTION....TVCMASSPROP PROGRAMMER...MELANSON (ENGEL, SCHLUNDT)
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#
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#
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# FUNCTIONAL DESCRIPTION:
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#
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# MASSPROP OPERATES IN TWO MODES:(1)IF LEM MASS OR CONFIGURATION ARE UPDATED (MASSPROP DOES NOT TEST
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# FOR THIS) THE ENTIRE PROGRAM MUST BE RUN THROUGH, BREAKPOINT VALUES AND DERIVATIVES OF THE OUTPUTS WITH
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# RESPECT TO CSM MASS BEING CALCULATED PRIOR TO CALCULATION OF THE OUTPUTS. (2)OTHERWISE, THE OUTPUTS CAN BE
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# CALCULATED USING PREVIOUSLY COMPUTED BREAKPOINT VALUES AND DERIVATIVES.
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#
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# CALLING SEQUENCES
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#
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# IF LEM MASS OR CONFIGURATION HAS BEEN UPDATED, TRANSFER TO MASSPROP, OTHERWISE TRANSFER TO FIXCW.
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# L TC BANKCALL OR IBNKCALL
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# L+1 CADR MASSPROP
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# OR
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# L+1 CADR FIXCW
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#
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# L+2 RETURNS VIA Q
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#
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# CALLED IN PARTICULAR BY DONOUN47 (JOB) AND TVCEXECUTIVE (TASK)
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#
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# JOBS OR TASKS INITIATED - NONE
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#
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# SUBROUTINES CALLED - NONE
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#
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# ERASABLE INITIALIZATION REQUIRED
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#
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# LEMMASS MUST CONTAIN LEM MASS SCALED AT B+16 KILOGRAMS
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# CSMMASS MUST CONTAIN CSM MASS SCALED AT B+16 KILOGRAMS
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#
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# DAPDATR1 MUST BE SET TO INDICATE VEHICLE CONFIGURATION.
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# BITS (15,14,13) = ( 0 , 0 , 1 ) LEM OFF
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# ( 0 , 1 , 0 ) LEM ON (ASCNT,DSCNT)
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# ( 1 , 1 , 0 ) LEM ON (ASCNT ONLY)
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#
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#
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# ALARMS - NONE
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#
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# EXIT - TC Q
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#
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# OUTPUTS:
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#
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# (1)IXX, SINGLE PRECISION SCALED AT B+20 IN KG-M SQ.
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# (2)IAVG, SINGLE PRECISION SCALED AT B+20 IN KG-M SQ.
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# (3)IAVG/TLX, SINGLE PRECISION, SCALED AT B+2 SEC-SQD
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# THEY ARE STORED IN CONSECUTIVE REGISTERS IXX0, IXX1, IXX2
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#
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# CONVERSION FACTOR : (SLUG-FTSQ) = 0.737562 (KG-MSQ)
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# Page 952
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#
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# OUTPUTS ARE CALCULATED AS FOLLOWS:
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#
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# (1) IF LEM DOCKED, LEMMASS IS FIRST ELIMINATED AS A PARAMETER
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#
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# VARST0 = INTVALUE0 + LEMMASS(SLOPEVAL0) IXX BREAKPOINT VALUE
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# VARST1 = INTVALUE1 + LEMMASS(SLOPEVAL1) IAVG BREAKPOINT VALUE
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# VARST2 = INTVALUE2 + LEMMASS(SLOPEVAL2) IAVG/TLX BREAKPOINT VALUE
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#
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# VARST3 = INTVALUE3 + LEMMASS(SLOPEVAL3) IAVG/TLX SLOPE FOR CSMMASS > 33956 LBS ( SPS > 10000 LBS)
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# VARST4 = INTVALUE4 + LEMMASS(SLOPEVAL4) IAVG SLOPE FOR CSMMASS > 33956 LBS ( SPS > 10000 LBS)
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#
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# VARST5 = INTVALUE5 + LEMMASS(SLOPEVAL5) IXX SLOPE FOR ALL VALUES OF CSMMASS
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#
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# VARST6 = INTVALUE6 + LEMMASS(SLOPEVAL6) IAVG SLOPE FOR CSMMASS < 33956 LBS ( SPS < 10000 LBS)
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# VARST7 = INTVALUE7 + LEMMASS(SLOPEVAL7) IAVG/TLX SLOPE FOR CSMMASS < 33956 LBS ( SPS < 10000 LBS)
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#
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# VARST8 = INTVALUE8 + LEMMASS(SLOPEVAL8) IAVG DECREMENT TO BRKPT VALUE WHEN LEM DSCNT STAGE OFF
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# VARST9 = INTVALUE9 + LEMMASS(SLOPEVAL9) IAVG/TLX DECREMENT TO BRKPT VALUE WHEN LEM DSCNT STAGE OFF
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#
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# (2) IF LEM NOT DOCKED
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#
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# VARST0 = NOLEMVAL0 WHERE THE MEANING AND SCALING OF VARST0
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# . . TO VARST9 ARE THE SAME AS GIVEN ABOVE
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# . .
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# . . NOTE... FOR THIS CASE, VARST8,9 HAVE NO
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# VARST9 = NOLEMVAL9 MEANING (THEY ARE COMPUTED BUT NOT USED)
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#
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# (3) THE FINAL OUTPUT CALCULATIONS ARE THEN DONE
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#
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# IXX0 = VARST0 + (CSMMASS + NEGBPW)VARST5 IXX
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#
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# IXX1 = VARST1 + (CSMMASS + NEGBPW)VARST(4 OR 6) IAVG
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#
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# IXX2 = VARST2 + (CSMMASS + NEGBPW)VARST(3 OR 7) IAVG/TLX
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#
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#
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# THE DATA USED CAME FROM CSM/LM SPACECRAFT OPERATIONAL DATA BOOK.
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# VOL. 3, NASA DOCUMENT SNA-8-D-027 (MARCH 1968)
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#
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# PERTINENT MASS DATA : CSM WEIGHT (FULL) 64100 LBS.
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# (EMPTY) 23956 LBS.
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# LEM WEIGHT (FULL) 32000 LBS.
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# (EMPTY) 14116 LBS.
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#
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# (WEIGHTS ARE FROM AMENDMENT #1 (APRIL 24,1968) TO ABOVE DATA BOOK)
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# Page 953
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BANK 25
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SETLOC DAPMASS
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BANK
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EBANK= BZERO
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COUNT* $$/MASP
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MASSPROP CAF NINE # MASSPROP USES TVC/RCS INTERRUPT TEMPS
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TS PHI333 # SET UP TEN PASSES
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LEMTEST CAE DAPDATR1 # DETERMINE LEM STATUS
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MASK BIT13
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EXTEND
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BZF LEMYES
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LEMNO INDEX PHI333 # LEM NOT ATTACHED
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CAF NOLEMVAL
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TCF STOINST
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LEMYES CAE LEMMASS # LEM IS ATTACHED
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DOUBLE
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EXTEND
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INDEX PHI333
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MP SLOPEVAL
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DDOUBL
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INDEX PHI333
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AD INTVALUE
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STOINST INDEX PHI333 # STORAGE INST BEGIN HERE
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TS VARST0
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CCS PHI333 # ARE ALL TEN PASSES COMPLETED
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TCF MASSPROP +1 # NO - GO DECREMENT PHI333
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DXTEST CCS DAPDATR1 # IF NEG, BIT15 IS 1, LEM DSCNT STAGE OFF
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TCF FIXCW
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TCF FIXCW
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DXCH VARST0 +8D
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DAS VARST0 +1
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CA DXITFIX
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ADS VARST0 +7
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FIXCW CAF BIT2 # COMPUTATION PHASE BEGINS HERE. SET UP
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TS PHI333 # THREE PASSES
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TS PSI333
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CAE CSMMASS # GET DELTA CSM WEIGHT - SIGN DETERMINES
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AD NEGBPW # SLOPE LOCATIONS.
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DOUBLE
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TS TEMP333
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# Page 954
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EXTEND
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BZMF PEGGY # DETERMINE CORRECT SLOPE
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CAF NEG2
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TS PHI333
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PEGGY INDEX PHI333 # ALL IS READY - CALCULATE OUTPUTS NOW
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CAE VARST5 # GET SLOPE
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EXTEND
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MP TEMP333 # MULT BY DELTA CSM WEIGHT
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DOUBLE
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INDEX PSI333
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AD VARST0 # ADD BREAKPOINT VALUE
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INDEX PSI333
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TS IXX # ****** OUTPUTS (IXX0, IXX1, IXX2) ******
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CCS PSI333 # BOOKKEEPING - MASSPROP FINISHED OR NOT
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TCF BOKKEP2 # NO - GO TAKE CARE OF INDEXING REGISTERS
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CAE DAPDATR1 # UPDATE WEIGHT/G
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MASK BIT14
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CCS A
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CA LEMMASS
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AD CSMMASS
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TS WEIGHT/G # SCALED AT B+16 KILOGRAMS
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ENDMASSP TC Q
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BOKKEP2 TS PSI333 # REDUCE PSI BY ONE
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EXTEND
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DIM PHI333
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TCF PEGGY
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# Page 955
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NOLEMVAL DEC 25445 B-20
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DEC 87450 B-20
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DEC .30715 B-2
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DEC 1.22877 E-5 B+12
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DEC 1.6096 B-6
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DEC 1.54 B-6
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DEC 7.77177 B-6
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DEC 3.46458 E-5 B+12
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INTVALUE DEC 26850 B-20
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DEC 127518 B-20
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DEC .54059 B-2
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DEC .153964 E-4 B+12
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DEC -.742923 B-6
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DEC 1.5398 B-6
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DEC 9.68 B-6
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DEC .647625 E-4 B+12
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DEC -27228 B-20
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DEC -.206476 B-2
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SLOPEVAL DEC 1.96307 B-6
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DEC 27.5774 B-6
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DEC 2.3548 E-5 B+12
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DEC 2.1777 E-9 B+26
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DEC 1.044 E-3 B+8
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DEC 0
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DEC 2.21068 E-3 B+8
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DEC 1.5166 E-9 B+26
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DEC -1.284 B-6
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DEC 2 E-5 B+12
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NEGBPW DEC -15402.17 B-16
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DXITFIX DEC* -1.88275 E-5 B+12*
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