Source Code

This is a reconstruction of the AGC program Luminary 99 Rev 0. It was the second release of the Lunar Module flight software targeted for use in Apollo 11, after Luminary 97. A bug (which had been around since at least Apollo 10, Luminary 69) was discovered in Rev 0 shortly before the Apollo 11 flight, resulting in a last minute revision into Rev 1, which is what actually flew rather than the Rev 0 presented here. A hardcopy of Rev 0 is known to exist — it belonged to AGC developer Allan Klumpp for many years — but unfortunately the Virtual AGC Project has not had access to that hardcopy. Thus the code you see here had been reconstructed (we believe accurately) rather than transcribed. The first step of the reconstruction of the Rev 0 source code was the transcription of the Rev 1 source code from a hardcopy in the MIT Museum collection. The process of reverting the active portion of the source code (i.e., other than program comments) from Rev 1 to Rev 0 was very minor, consisting only of moving the position of the STARTSB1 label in FRESH START AND RESTART. Allan had previously given us the checksums of the memory banks of Rev 0, and we have verified the program presented here has checksums identical to all banks of Allan's listing of Rev 0. The notations on Allan's Rev 0 program listing read, in part:

	GAP:  ASSEMBLE REVISION 099 OF AGC PROGRAM LUMINARY BY NASA 2021112-051

A single program comment is known to differ between Rev 0 and Rev 1, but these are harder to reconstruct and verify than changes to the active portion of the code. Thus it is possible that there are additional differences between the program comments in Rev 0 and Rev 1 that are unknown to us, and therefore are not reflected in the code presented here.

048005,000002:                                                                                                  ## Copyright:   Public domain.
048006,000003:                                                                                                  ## Filename:    SINGLE_PRECISION_SUBROUTINES.agc
048007,000004:                                                                                                  ## Purpose:     Part of the reconstructed source code for LMY99 Rev 0,
048008,000005:                                                                                                  ##              otherwise known as Luminary Rev 99, the second release
048009,000006:                                                                                                  ##              of the Apollo Guidance Computer (AGC) software for Apollo 11.
048010,000007:                                                                                                  ##              It differs from LMY99 Rev 1 (the flown version) only in the
048011,000008:                                                                                                  ##              placement of a single label. The corrections shown here have
048012,000009:                                                                                                  ##              been verified to have the same bank checksums as AGC developer
048013,000010:                                                                                                  ##              Allan Klumpp's copy of Luminary Rev 99, and so are believed
048014,000011:                                                                                                  ##              to be accurate. This file is intended to be a faithful 
048015,000012:                                                                                                  ##              recreation, except that the code format has been changed to 
048016,000013:                                                                                                  ##              conform to the requirements of the yaYUL assembler rather than 
048017,000014:                                                                                                  ##              the original YUL assembler.
048018,000015:                                                                                                  ##
048019,000016:                                                                                                  ## Assembler:   yaYUL
048020,000017:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
048021,000018:                                                                                                  ## Website:     www.ibiblio.org/apollo.
048022,000019:                                                                                                  ## Pages:       1102
048023,000020:                                                                                                  ## Mod history: 2009-05-25 RSB  Adapted from the corresponding 
048024,000021:                                                                                                  ##                              Luminary131 file, using page 
048025,000022:                                                                                                  ##                              images from Luminary 1A.
048026,000023:                                                                                                  ##              2010-12-31 JL   Fixed page number comment.
048027,000024:                                                                                                  ##              2016-12-17 RSB  Proofed text comments with octopus/ProoferComments
048028,000025:                                                                                                  ##                              and corrected the errors found.
048029,000026:                                                                                                  ##              2017-08-01 MAS  Created from LMY99 Rev 1.
048030,000027: 
048031,000028:                                                                                                  ## This source code has been transcribed or otherwise adapted from
048032,000029:                                                                                                  ## digitized images of a hardcopy from the MIT Museum.  The digitization
048033,000030:                                                                                                  ## was performed by Paul Fjeld, and arranged for by Deborah Douglas of
048034,000031:                                                                                                  ## the Museum.  Many thanks to both.  The images (with suitable reduction
048035,000032:                                                                                                  ## in storage size and consequent reduction in image quality as well) are
048036,000033:                                                                                                  ## available online at www.ibiblio.org/apollo.  If for some reason you
048037,000034:                                                                                                  ## find that the images are illegible, contact me at info@sandroid.org
048038,000035:                                                                                                  ## about getting access to the (much) higher-quality images which Paul
048039,000036:                                                                                                  ## actually created.
048040,000037:                                                                                                  ##
048041,000038:                                                                                                  ## The code has been modified to match LMY99 Revision 0, otherwise
048042,000039:                                                                                                  ## known as Luminary Revision 99, the Apollo 11 software release preceeding
048043,000040:                                                                                                  ## the listing from which it was transcribed. It has been verified to
048044,000041:                                                                                                  ## contain the same bank checksums as AGC developer Allan Klumpp's listing
048045,000042:                                                                                                  ## of Luminary Revision 99 (for which we do not have scans).
048046,000043:                                                                                                  ##
048047,000044:                                                                                                  ## Notations on Allan Klumpp's listing read, in part:
048048,000045:                                                                                                  ##
048049,000046:                                                                                                  ##      ASSEMBLE REVISION 099 OF AGC PROGRAM LUMINARY BY NASA 2021112-51
048050,000047: 

Page 1102

048052,000049:    5032                                           BLOCK    02                                    
048053,000050: 
048054,000051:                                                                                                  #  SINGLE PRECISION SINE AND COSINE
048055,000052: 
048056,000053:    5032                                           COUNT*   $$/INTER                              
048057,000054:    5032           64736        SPCOS              AD       HALF                                  #  ARGUMENTS SCALED AT PI
048058,000055:    5033           55076        SPSIN              TS       TEMK                                  
048059,000056:    5034           15036                           TCF      SPT                                   
048060,000057:    5035           41076                           CS       TEMK                                  
048061,000058:    5036           60000        SPT                DOUBLE                                         
048062,000059:    5037           55076                           TS       TEMK                                  
048063,000060:    5040           15051                           TCF      POLLEY                                
048064,000061:    5041           57076                           XCH      TEMK                                  
048065,000062:    5042           51076                           INDEX    TEMK                                  
048066,000063:    5043           64734                           AD       LIMITS                                
048067,000064:    5044           40000                           COM                                            
048068,000065:    5045           61076                           AD       TEMK                                  
048069,000066:    5046           55076                           TS       TEMK                                  
048070,000067:    5047           15051                           TCF      POLLEY                                
048071,000068:    5050           15067                           TCF      ARG90                                 
048072,000069:    5051           00006        POLLEY             EXTEND                                         
048073,000070:    5052           71076                           MP       TEMK                                  
048074,000071:    5053           55077                           TS       SQ                                    
048075,000072:    5054           00006                           EXTEND                                         
048076,000073:    5055           75005                           MP       C5/2                                  
048077,000074:    5056           67737                           AD       C3/2                                  
048078,000075:    5057           00006                           EXTEND                                         
048079,000076:    5060           71077                           MP       SQ                                    
048080,000077:    5061           67717                           AD       C1/2                                  
048081,000078:    5062           00006                           EXTEND                                         
048082,000079:    5063           71076                           MP       TEMK                                  
048083,000080:    5064           20001                           DDOUBL                                         
048084,000081:    5065           55076                           TS       TEMK                                  
048085,000082:    5066           00002                           TC       Q                                     
048086,000083:    5067           50000        ARG90              INDEX    A                                     
048087,000084:    5070           44734                           CS       LIMITS                                
048088,000085:    5071           00002                           TC       Q                                     #  RESULT SCALED AT 1
048089,000086: 
048090,000087: 

End of include-file SINGLE_PRECISION_SUBROUTINES.agc.  Parent file is MAIN.agc