29 Apr
2012
29 Apr
'12
10:46 a.m.
This thread reminds me of a computer we built at school from discrete transistors. Each
transistor was a NOR gate with three resistors on the base and a collector resistor. All
soldered onto squares of tag board. We put a bunch of them together to build a shift
register with small laps as output. That would be about 1969 or 1970.
Does anyone remember any more? It must have been a published design somewhere.
Richard Smith
Technical Director, Mewgull Associates Limited, Bristol
"We harvest the sun"
Lead Tutor, Centre for Alternative Technology, Machynlleth
Sent from my iPad
On 29 Apr 2012, at 18:26, ben <bfranchuk at jetnet.ab.ca> wrote:
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.
The SMALL and the BIG. Looking at the ICT 1301 around here.
http://www.shedlandz.co.uk/
Last years open house video was what caught my eye.
http://oldwuzzark.co.uk/exprtvid/od11_big.wmv
--Chuck
Ben.