[13]. Errata sheets for G-15D Technical Manual Revision #1. 9 june 1961 (98kb).
[14]. G-15 Supplementary Drawings: Alphanumeric Input/Output System. (1.25 Mb) Edition AET-05615, May 1961. publ. Bendix Computer Division of The Bendix Corporation.
Drawings intended to supplement those in the G15D TECHNICAL MANUAL - REVISION #1, which document/s the NUMERIC G15's. The drawings cover the ALPHANUMERIC INPUT/OUTPUT SYSTEM and the associated TYPEWRITERS (AT-1, AT-2) and COUPLERS (NC-1, ANC-1, ANC-2). Also included are three drawings (72-74) covering new circuits not necessarily associated with the INPUT/OUTPUT system. A summary of the G15 logic changes is provided on drawing 66 in equation form.
INDEX OF DRAWINGS 65. INTRODUCTION 66. EQUATIONS 67. AN IN/OUT CONTROL (OC's) 68. AN INPUT block 69. AN SLOW OUT block 70. THE OUTPUT LINK 71. AN-RELAY CHASSIS 72. ACCESSORY CONTROL #1 73. ACCESSORY CONTROL #2 74. CF3 PACKAGE 75. NC-1: NUM. COUPLER 76. ANC-1: CONTROL CIRCUITS 77. ANC-1: DECODER (simplified) 78. ANC-1: DECODER (detailed) 79. " " " 80. ANC-1: ENCODER (detailed) 81. " " " 82. ANC-2: DECODER 83. ANC-2: RELAY CONTROL 84. ANC-2: ENCODER 85. ANC-2: G15 CONTROL 86. IN/OUT WRITER (AT-1/AT-2) 87. " " " 88. ANC-1: AN TYPE-OUT TIMING
[15]. G-15 Cable and Harness Connections Edition FA 3012, 16 May 1961. Effective ECO 1119. publ. Customer Engineering, Bendix Computer Division of The Bendix Corporation. (1.2 Mb).
[16]. Algebraic Compiler for the Bendix G-15, T21-1, December 1960 publ. Bendix Computer Division of The Bendix Corporation. (Description of ALGO language - programming instructions).
[17]. Programming notes for the ALGO system. 27 March 1961. Technical Applications Memorandum No. 72 publ. Bendix Computer Division of The Bendix Corporation. (16 questions and answers about ALGO programming).
[18]. ALGO Operating Instructions, T22, January 1961 publ. Bendix Computer Division of The Bendix Corporation. (Comprehensive operating instructions).
[19]. DA-1 Programming Manual Edition APR-03581-3, June 1961, supersedes T5-2, March 1958 publ. Bendix Computer Division of The Bendix Corporation. (1.9 Mb).
[20]. Intercom 1000 Reference Card, side 1 and side 2. This is a pocket sized card (6" x 3.375") published by the Bendix Computer Division of The Bendix Corporation in 1958. It was kindly donated to the ACMSWA by Dr Bernie Jepson. It is the only original Intercom item we have. It seems the Main Roads Department (the original users here in Perth) developed their own alternative to Intercom, named Marcode. This was a special interpreter "primarily for use in the field of highway geometric computations ... provides an optimum balance of system features suitable for this class of program". It combined the features of Intercom 500 with some other features from the SICOM Interpretive System for the CDC 160 computers and seems to have replaced the need for Intercom. Unfortunately, the code for Marcode has been lost.
![[20]. Intercom 1000 Reference Card, side 1](http://members.iinet.net.au/~dgreen/Bendix/I1000cdb.jpg){kind=link}
[21]. The INTERCOM 500 Programming System for the BENDIX G-15 66 page manual, Edition APG-06611, June 1961 publ. Bendix Computer Division of The Bendix Corporation. (14.7 Mb). Scanned from an original manual kindly lent to me by Paul Horvath
[22]. POGO Compiler for the Bendix G-15 General Purpose Digital Computer
13 page manual, Edition CB-019, January 1959
publ. Bendix Computer Division of The Bendix Corporation. (1.4 Mb).
Scanned from a photocopy kindly lent to me by Rick Crowhurst
What is available elsewhere
One other collector who has posted information on the Web is Paul Pierce.
His extensive collection includes a Bendix G-15 and, in response to our queries
about Intercom, he has posted the following documents at his site:
What we don't have
It is hard to know what you don't have.Most importantly, we don't have a Maintenance Manual. But did one exist? I have been advised that a Maintenace Manual was prepared and issued with just the first few G-15 machines, but then withdrawn and replaced by references 9 to 14 listed above. As the following passage from the preface in [9] states:
- "Maintenance techniques are not discussed to any great extent in this manual. Volumes would be required to do this subject justice. In general, engineering experience and the process of elimination should handle most problems which may arise. The CUSTOMER ENGINEERING department may always be consulted in the event of extraordinary problems."
Always is a long time. I doubt they are answering calls now. It appears that Customer Engineering issued occasional maintenance bulletins and it would be nice to locate copies. One document we would particularly like to have is mentioned in [9, page 17]:
- "Clock Track: The recording procedure (for this track) is performed at the factory and would constitute a difficult problem to re-record in the field. In the unlikely event that re-recording of an erased Clock Track is necessary, instructions for doing so in the field can be obtained from Customer Engineering."
Documents/software in the nice to have category include:
[ 1]. The tapes or code for the ALGO compiler. The compiler comprised six magazines. #1, #2, #3 interpreted the Algo code in three stages and produced object code; #4 ran the object code and produced answers; #5 was the "updater" - some kind of editor; #6 was the "housekeeper", used to modify or expand the ALGO system. According to Bendix, theirs was the first implementation of Algol.
[ 2]. The ALGO library of subroutines, mentioned in [15, page 23].
[ 3]. The code for any of the 821 applications projects for which abstracts were published up until 21 January 1966, (especially of the various utilities), mainly as further examples of how to code the G-15.
[ 4]. Various programming manuals mentioned in the December 1966 Newsletter:
[ 5]. And of course, all that interesting stuff we don't know about.
If you can help, please get in touch.
