Practical Electronics CHAMP/Tangerine Microtan 65

From: ben franchuk <>
Date: Thu May 22 18:58:00 2003

David Comley wrote:

> Since you mention it, I had been thinking about
> designing and building a processor from scratch from
> TTL devices. I am slowly accumulating TTL chips as I
> come across them at hamfests and things. Perhaps it's
> time to put pencil to paper.
> Of course I could take the NASA Apollo Guidance
> Computer approach and build everything welded-cordwood
> style out of NOR gates.

Nope that used lots of REAL ( expensive ) TTL.
The neat part of that was the CORE memory used.

Any how a real TTL computer is about 4+ large
logic cards. Control card, alu card, memory card
and serial I/O card. The mother board is bus
and front pannel logic.
I am doing a 20 bit CPU with about 125 chips total
in the computer and front panel. About 50?
more chips for memory and serial i/o.
Received on Thu May 22 2003 - 18:58:00 BST

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