22 May
2003
22 May
'03
6:58 p.m.
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.
http://www.jetnet.ab.ca/users/bfranchuk/ldp/ldp1.html
Ben.