TTL homebrew CPUs
shoppa_classiccmp at trailing-edge.com
Sat Jul 7 17:44:13 CDT 2007
"Chuck Guzis" <cclist at sydex.com> wrote:
> On 7 Jul 2007 at 21:38, Lars Hamren wrote:
> > 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.
> Wasn't there an article in one of the magazines (Byte,
> Microcomputing, Kilobaud???) where a fellow gave details about
> constructing his own TTL 8080 CPU?
I remember a homebrew TTL CPU that used 7489's (16x4 SRAM. Not 16Kx4,
or 16Mx4, just 16x4!) in a dense array for main memory. Something
about baby-bottle liners filled with chilled water to keep them cool...
Would've been mid-70's or earlier. By the mid-70's 2102's were available
and nobody would've been using 7489's.
Don't remember which magazine!
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