TTL homebrew CPUs

Lars Hamren hamren at sdu.se
Sat Jul 7 14:38:15 CDT 2007


The first computer built by Computer Automation, circa 1967, was the
PDC 808. It was an 8-bit TTL-only machine with a very basic
instruction set. In "Computer Technician's Handbook" Brice Ward
describes tat machine in great detail. Should be enough to build a
replica from.

A scanned version of the relevant parts of that book is available from

    http://www.sdu.se/computer-automation-museum/books_in_the_collection.html

PDC stands for Programmable Digital Controller. The word "computer"
was avoided because people were afraid of them!

The "8" means 8 uS cycle time, and "08" means 8 bits. The 208 was
three times as fast (2.66 uS cycle time, hence the "2").

/Lars
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