On Wed, 16 Dec 1998, Tony Duell wrote:
The first was made/cloned/sold by many companies,
including radio shack.
It consists of a number (8 or 10?) of multi-pole changeover slide
swtichs, which are the 'input'. The output is a row of torch (flashlight)
bulbs. You 'program' it by patching wires between the switch contacts,
thus making up logic gates (2 contacts in series = AND, 2 in parallel =
OR, etc). I seem to remember that the manual for the one I had (and
probably still have) included wiring for NIM, etc.
My main critism was that the various patch diagrams were never
explained. OK, so it was fun to make a binary adder or whatever, but to
me it would have been even more fun to understand why.
Agreed, I find that this is one of the least interesting early toy
"computers" for that reason. BTW, in the US it was marketed as the
Science Fair Digital Computer Kit.
The other is, I think, considerably rarer. It was made
by Philips, and
called the CL1600 series. It consists of a number of logic blocks that
can be wired (using patch leads) as a general 3-input logic gate. There
are 3 input sockets (A,B,C), one output socket (F) with a lamp next to
it, and 8 sockets to program the logic function, Another module, the same
size contained a battery-operated PSU and 6 input switches
That's one I haven't encountered. If you get a chance to photocopy the
manual for it, I'll see if I can dig up a service manual of some sort you
don't have yet :-)
-- Doug