TTL homebrew CPUs

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 ------------------------------------------------------------------- Lars Hamr?n Tel...: +46( 46)189090 Svensk Datorutveckling Mobile: +46(705)189090 Vadm?llan 211 e-mail: hamren at sdu.se S-225 94 Lund WWW...: www.sdu.se Sweden