### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: TVCMASSPROP.agc
## Purpose: Part of the source code for Colossus 2A, AKA Comanche 055.
## It is part of the source code for the Command Module's (CM)
## Apollo Guidance Computer (AGC), for Apollo 11.
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo.
## Pages: 951-955
## Mod history: 2009-05-13 RSB Adapted from the Colossus249/ file of the
## same name, using Comanche055 page images.
## 2016-12-21 RSB Proofed comment text using octopus/ProoferComments
## and corrected the errors found.
## 2017-01-20 RSB Fixed comment-text errors noted while diff'ing
## vs Colossus 249.
##
## This source code has been transcribed or otherwise adapted from digitized
## images of a hardcopy from the MIT Museum. The digitization was performed
## by Paul Fjeld, and arranged for by Deborah Douglas of the Museum. Many
## thanks to both. The images (with suitable reduction in storage size and
## consequent reduction in image quality as well) are available online at
## www.ibiblio.org/apollo. If for some reason you find that the images are
## illegible, contact me at info@sandroid.org about getting access to the
## (much) higher-quality images which Paul actually created.
##
## Notations on the hardcopy document read, in part:
##
## Assemble revision 055 of AGC program Comanche by NASA
## 2021113-051. 10:28 APR. 1, 1969
##
## This AGC program shall also be referred to as
## Colossus 2A
## Page 951
# PROGRAM NAME....MASSPROP
# LOG SECTION....TVCMASSPROP PROGRAMMER...MELANSON (ENGEL, SCHLUNDT)
#
# FUNCTIONAL DESCRIPTION:
#
# MASSPROP OPERATES IN TWO MODES: (1) IF LEM MASS OR CONFIGURATION ARE UPDATED (MASSPROP DOES NOT TEST
# FOR THIS) THE ENTIRE PROGRAM MUST BE RUN THROUGH, BREAKPOINT VALUES AND DERIVATIVES OF THE OUTPUTS WITH
# RESPECT TO CSM MASS BEING CALCULATED PRIOR TO CALCULATION OF THE OUTPUTS. (2) OTHERWISE, THE OUTPUTS CAN BE
# CALCULATED USING PREVIOUSLY COMPUTED BREAKPOINT VALUES AND DERIVATIVES.
#
# CALLING SEQUENCES
#
# IF LEM MASS OR CONFIGURATION HAS BEEN UPDATED, TRANSFER TO MASSPROP, OTHERWISE TRANSFER TO FIXCW.
# L TC BANKCALL OR IBNKCALL
# L+1 CADR MASSPROP
# OR
# L+1 CADR FIXCW
# L+2 RETURNS VIA Q
#
# CALLED IN PARTICULAR BY DONOUN47 (JOB) AND TVCEXECUTIVE (TASK)
#
# JOBS OR TASKS INITIATED - NONE
#
# SUBROUTINES CALLED - NONE
#
# ERASABLE INITIALIZATION REQUIRED
#
# LEMMASS MUST CONTAIN LEM MASS SCALED AT B+16 IN KILOGRAMS
# CSMMASS MUST CONTAIN CSM MASS SCALED AT B+16 IN KILOGRAMS
# DAPDATR1 MUST BE SET TO INDICATE VEHICLE CONFIGURATION.
# BITS (15,14,13) = ( 0 , 0 , 1 ) LEM OFF
# ( 0 , 1 , 0 ) LEM ON (ASCNT,DSCNT)
# ( 1 , 1 , 0 ) LEM ON (ASCNT ONLY)
#
# ALARMS - NONE
#
# EXIT - TC Q
#
# OUTPUTS:
#
# (1) IXX, SINGLE PRECISION SCALED AT B+20 IN KG-M SQ.
# (2) IAVG, SINGLE PRECISION SCALED AT B+20 IN KG-M SQ.
# (3) IAVG/TLX, SINGLE PRECISION, SCALED AT B+2 SEC-SQD
#
# THEY ARE STORED IN CONSECUTIVE REGISTERS IXX0, IXX1, IXX2
# CONVERSION FACTOR: (SLUG-FTSQ) = 0.737562 (KG-MSQ)
## Page 952
#
# OUTPUTS ARE CALCULATED AS FOLLOWS:
#
# (1) IF LEM DOCKED, LEMMASS IS FIRST ELIMINATED AS A PARAMETER
#
# VARST0 = INTVALUE0 + LEMMASS(SLOPEVAL0) IXX BREAKPOINT VALUE
# VARST1 = INTVALUE1 + LEMMASS(SLOPEVAL1) IAVG BREAKPOINT VALUE
# VARST2 = INTVALUE2 + LEMMASS(SLOPEVAL2) IAVG/TLX BREAKPOINT VALUE
#
# VARST3 = INTVALUE3 + LEMMASS(SLOPEVAL3) IAVG/TLX SLOPE FOR CSMMASS > 33956 LBS (SPS > 10000 LBS)
# VARST4 = INTVALUE4 + LEMMASS(SLOPEVAL4) IAVG SLOPE FOR CSMMASS > 33956 LBS (SPS > 10000 LBS)
#
# VARST5 = INTVALUE5 + LEMMASS(SLOPEVAL5) IXX SLOPE FOR ALL VALUES OF CSMMASS
#
# VARST6 = INTVALUE6 + LEMMASS(SLOPEVAL6) IAVG SLOPE FOR CSMMASS < 33956 LBS (SPS < 10000 LBS)
# VARST7 = INTVALUE7 + LEMMASS(SLOPEVAL7) IAVG/TLX SLOPE FOR CSMMASS < 33956 LBS (SPS < 10000 LBS)
#
# VARST8 = INTVALUE8 + LEMMASS(SLOPEVAL8) IAVG DECREMENT TO BRKPT VALUE WHEN LEM DSCNT STAGE OFF
# VARST9 = INTVALUE9 + LEMMASS(SLOPEVAL9) IAVG/TLX DECREMENT TO BRKPT VALUE WHEN LEM DSCNT STAGE OFF
#
# (2) IF LEM NOT DOCKED
#
# VARST0 = NOLEMVAL0 WHERE THE MEANING AND SCALING OF VARST0
# . . TO VARST9 ARE THE SAME AS GIVEN ABOVE
# . .
# . . NOTE... FOR THIS CASE, VARST8,9 HAVE NO
# VARST9 = NOLEMVAL9 MEANING (THEY ARE COMPUTED BUT NOT USED)
#
# (3) THE FINAL OUTPUT CALCULATIONS ARE THEN DONE
#
# IXX0 = VARST0 + (CSMMASS + NEGBPW)VARST5 IXX
#
# IXX1 = VARST1 + (CSMMASS + NEGBPW)VARST(4 OR 6) IAVG
#
# IXX2 = VARST2 + (CSMMASS + NEGBPW)VARST(3 OR 7) IAVG/TLX
#
# THE DATA USED CAME FROM CSM/LM SPACECRAFT OPERATIONAL DATA BOOK.
# VOL. 3, NASA DOCUMENT SNA-8-D-027 (MARCH 1968)
#
# PERTINENT MASS DATA: CSM WEIGHT (FULL) 64100 LBS
# (EMPTY) 23956 LBS
# LEM WEIGHT (FULL) 32000 LBS
# (EMPTY) 14116 LBS
#
# (WEIGHTS ARE FROM AMENDMENT #1 (APRIL 24, 1968) TO ABOVE DATA BOOK)
## Page 953
BANK 25
SETLOC DAPMASS
BANK
EBANK= BZERO
COUNT* $$/MASP
MASSPROP CAF NINE # MASSPROP USES TVC/RCS INTERUPT TEMPS
TS PHI333 # SET UP TEN PASSES
LEMTEST CAE DAPDATR1 # DETERMINE LEM STATUS
MASK BIT13
EXTEND
BZF LEMYES
LEMNO INDEX PHI333 # LEM NOT ATTACHED
CAF NOLEMVAL
TCF STOINST
LEMYES CAE LEMMASS # LEM IS ATTACHED
DOUBLE
EXTEND
INDEX PHI333
MP SLOPEVAL
DDOUBL
INDEX PHI333
AD INTVALUE
STOINST INDEX PHI333 # STORAGE INST BEGIN HERE
TS VARST0
CCS PHI333 # ARE ALL TEN PASSES COMPLETED
TCF MASSPROP +1 # NO - GO DECREMENT PHI333
DXTEST CCS DAPDATR1 # IF NEG, BIT15 IS 1, LEM DSCNT STAGE OFF
TCF FIXCW
TCF FIXCW
DXCH VARST0 +8D
DAS VARST0 +1
CA DXITFIX
ADS VARST0 +7
FIXCW CAF BIT2 # COMPUTATION PHASE BEGINS HERE. SET UP
TS PHI333 # THREE PASSES
TS PSI333
CAE CSMMASS # GET DELTA CSM WEIGHT - SIGN DETERMINES
AD NEGBPW # SLOPE LOCATIONS.
DOUBLE
TS TEMP333
## Page 954
EXTEND
BZMF PEGGY # DETERMINE CORRECT SLOPE
CAF NEG2
TS PHI333
PEGGY INDEX PHI333 # ALL IS READY - CALCULATE OUTPUTS NOW
CAE VARST5 # GET SLOPE
EXTEND
MP TEMP333 # MULT BY DELTA CSM WEIGHT
DOUBLE
INDEX PSI333
AD VARST0 # ADD BREAKPOINT VALUE
INDEX PSI333
TS IXX # ****** OUTPUTS (IXX0, IXX1, IXX2) ******
CCS PSI333 # BOOKKEEPING - MASSPROP FINISHED OR NOT
TCF BOKKEP2 # NO - GO TAKE CARE OF INDEXING REGISTERS
CAE DAPDATR1 # UPDATE WEIGHT/G
MASK BIT14
CCS A
CA LEMMASS
AD CSMMASS
TS WEIGHT/G # SCALED AT B+16 IN KILOGRAMS
ENDMASSP TC Q
BOKKEP2 TS PSI333 # REDUCE PSI BY ONE
EXTEND
DIM PHI333
TCF PEGGY
## Page 955
NOLEMVAL DEC 25445 B-20
DEC 87450 B-20
DEC .30715 B-2
DEC 1.22877 E-5 B+12
DEC 1.6096 B-6
DEC 1.54 B-6
DEC 7.77177 B-6
DEC 3.46458 E-5 B+12
INTVALUE DEC 26850 B-20
DEC 127518 B-20
DEC .54059 B-2
DEC .153964 E-4 B+12
DEC -.742923 B-6
DEC 1.5398 B-6
DEC 9.68 B-6
DEC .647625 E-4 B+12
DEC -27228 B-20
DEC -.206476 B-2
SLOPEVAL DEC 1.96307 B-6
DEC 27.5774 B-6
DEC 2.3548 E-5 B+12
DEC 2.1777 E-9 B+26
DEC 1.044 E-3 B+8
DEC 0
DEC 2.21068 E-3 B+8
DEC 1.5166 E-9 B+26
DEC -1.284 B-6
DEC 2 E-5 B+12
NEGBPW DEC -15402.17 B-16
DXITFIX DEC* -1.88275 E-5 B+12*