Documentation, Programming Manual for the Bunker-Ramo Model 130 and Model 133 Digital Computers

This spiral-bound document is a copy of the programing manual for Bunker-Ramo computer models 130 and 133. These models were the basis for the computers the company built for military applications.
According to the donor who wrote programs for a BR-130, "The TRW-130 (also known as the BR130) was the most interesting machine that I have ever programmed. Normally the lowest level language is an assembler language. In an assembly language, each assembly instruction performs a single function, e.g. add, subtract, compare, branch, shift, etc. There are no more basic operations. These instructions are hardwired in the machines physical architecture. In those early days, the physical architecture was made up of gates, flip-flops, registers, etc., prior to integrated circuits. There were only a limited number of these component types, so the various hardwired instructions were made up of fixed combinations of these. Therefore there was significant duplication of these components. TRW engineering came up with a very clever idea. Could a lower level of software be used to implement the assembly level instructions by causing these components to be combined/reorganized in real-time to execute the entire instruction set? The answer was yes. It allowed for a cheaper and more versatile machine. I cannot remember, but I believe these lower level instructions were called ‘logans’." (The word “logand” was a computer acronym for “logical command” the intermediate level programming language planned in the design of the TRW-130 computer.)
Nonccession file 2015.3097.
Currently not on view
date made
Bunker-Ramo Corporation
place made
United States: California, Los Angeles, Canoga Park
Physical Description
paper (sheets material)
plastic (spiral bindint material)
overall: 1.6 cm x 23 cm x 28 cm; 5/8 in x 9 1/16 in x 11 1/32 in
ID Number
nonaccession number
catalog number
Credit Line
Gift of R. Kirk Lubbes
See more items in
Medicine and Science: Computers
Computers & Business Machines
Data Source
National Museum of American History


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