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AN/FSQ-7: the computer that shaped the Cold War by Bernd Ulmann

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12 Programming

Programming an early computer like the AN/FSQ-7 was quite different from today’s perspective as many of the modern programming idioms, such as using a stack for parameter passing to subroutines and storing return addresses etc. were not used back then. In addition to that, the two 16 bit arithmetic elements of the AN/FSQ-7, working in parallel, are still a rather unusual feature.

The following sections give an overview of the instruction format, instruction set, and typical programming idioms with regard to indexing and subroutine handling. The final AN/FSQ-7/8 computers featured 59 different instructions grouped into eight classes, while the XD-1 prototype implemented only 48 instructions. All following examples and tables are ...

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