S-BAND_ANTENNA_FOR_CM.agc
### FILE="Main.annotation"
## Copyright: Public domain.
## Filename: S-BAND_ANTENNA_FOR_CM.agc
## Purpose: A section of Comanche revision 044.
## It is part of the reconstructed source code for the
## original release of the flight software for the Command
## Module's (CM) Apollo Guidance Computer (AGC) for Apollo 10.
## The code has been recreated from a copy of Comanche 055. It
## has been adapted such that the resulting bugger words
## exactly match those specified for Comanche 44 in NASA drawing
## 2021153D, which gives relatively high confidence that the
## reconstruction is correct.
## Assembler: yaYUL
## Contact: Ron Burkey <info@sandroid.org>.
## Website: www.ibiblio.org/apollo/index.html
## Mod history: 2020-12-03 MAS Created from Comanche 51.
## Page 934
BANK 23
SETLOC SBAND
BANK
COUNT* $$/R05
EBANK= EMSALT
SBANDANT TC BANKCALL # V 64 E GETS US HERE
CADR R02BOTH # CHECK IF IMU IS ON AND ALIGNED
TC INTPRET
RTB CALL
LOADTIME # PICKUP CURRENT TIME SCALED B-28
CDUTRIG # COMPUTE SINES AND COSINES OF CDU ANGLES
STCALL TDEC1 # ADVANCE INTEGRATION TO TIME IN TDEC1
CSMCONIC # USING CONIC INTEGRATION
SLOAD BHIZ # ORIGIN OF REFERENCE INERTIAL SYSTEM IS
X2 # EARTH = 0, MOON = 2
EISOI
VLOAD
RATT
STORE RCM # MOVE RATT TO PREVENT WIPEOUT
DLOAD CALL # MOON, PUSH ON
TAT # GET ORIGINAL TIME
LUNPOS # COMPUTE POSITION VECTOR OF MOON
VAD VCOMP # R= -(REM+RCM) = NEG. OF S/C POS. VEC
RCM
GOTO
EISOI +2
EISOI VLOAD VCOMP # EARTH, R= -RCM
RATT
SETPD MXV # RCS TO STABLE MEMBER- B-1X B-29X B+1
2D # 2D
REFSMMAT # STABLE MEMBER. B-1X B-29X B+1= B-29
VSL1 PDDL # 8D
HI6ZEROS
STOVL YAWANG # ZERO OUT YAWANG, SET UP FOR SMNB
RCM # TRANSFORMATION. SM COORD. SCALED B-29
CALL
*SMNB*
STORE R # SAVE NAV. BASE COORDINATES
UNIT PDVL # 14D
R
VPROJ VSL2 # COMPUTE PROJECTION OF VECTOR INTO CM
HIUNITZ # XY-PLANE, R-(R.UZ)UZ
BVSU BOV # CLEAR OVERFLOW INDICATOR IF SET
R
COVCNV
COVCNV UNIT BOV # TEST OVERFLOW FOR INDICATION OF NULL
NOADJUST # VECTOR
PUSH DOT # 20D
## Page 935
HIUNITX # COMPUTE YAW ANGLE = ACOS (URP.UX)
SL1 ACOS # REVOLUTIONS SCALED B0
PDVL DOT # 22D YAWANG
URP
HIUNITY # COMPUTE FOLLOWING- URP.UY
SL1 BPL # POSITIVE
NOADJUST # YES, 0-180 DEGREES
DLOAD DSU # NO, 181-360 DEGREES 20D
DPPOSMAX # COMPUTE 2 PI MINUS YAW ANGLE
PUSH # 22D YAWANG
NOADJUST VLOAD DOT # COMPUTE PITCH ANGLE
UR # ACOS (UR.UZ) - PI/2
HIUNITZ
SL1 ACOS # REVOLUTIONS B0
DSU
HIDP1/4
STODL RHOSB
YAWANG
STORE GAMMASB # PATCH FOR CHECKOUT
EXIT
CA EXTVBACT # IS BIT 5 STILL ON
MASK BIT5
EXTEND
BZF ENDEXT # NO, WE HAVE BEEN ANSWERED
CAF V06N51 # DISPLAY ANGLES
TC BANKCALL
CADR GOMARKFR
TC B5OFF # TERMINATE
TC B5OFF
TC ENDOFJOB # RECYCLE
CAF BIT3 # IMMEDIATE RETURN
TC BLANKET # BLANK R3
CAF BIT1 # DELAY MINIMUM TIME TO ALLOW DISPLAY IN
TC BANKCALL
CADR DELAYJOB
TCF SBANDANT +2
V06N51 VN 0651
RCM EQUALS 2D
UR EQUALS 8D
URP EQUALS 14D
YAWANG EQUALS 20D
PITCHANG EQUALS 22D
R EQUALS RCM
SBANK= LOWSUPER