28 Apr
2012
28 Apr
'12
7:13 p.m.
On 28 Apr 2012 at 18:20, Jon Elson wrote:
A while ago somebody mentioned thinking about building
a
discrete transistor computer. I ran across the link again of
the one I saw (only online)
http://www.6502.org/users/dieter/mt15/mt15.htm
With all SMT, he packs the boards very closely, performance
is of course not so great with discrete junction transistors running
in saturation.
Lots of transistors, aren't there? I think of the PB-250--a
minicomputer (even though the name didn't exist then) with about 300
transistors and a mess of diodes. 21 bit words+sign,
magnetostrictive recirculating memory. Powered from a standard wall
outlet. Bitsavers has very complete details, including circuit card
schematics.
--Chuck