20 Dec
2007
20 Dec
'07
10:29 a.m.
From: Robert Nansel <bnansel at bigpond.net.au>
1) To build a complete functional computer,
including memory, using
no more than 256 2N2222-ish transistors (plus scads of diodes, resistors,
etc.).
2) Use no ICs or other parts that wouldn't have been available to
hobbyists ca. 1965.
Well, if you put no limit on the number of diodes (just 3 terminal
devices), you can go a heckuva long way using tunnel diodes or even
diacs.
Or you could use magnetic core logic, using transistors only as I/O
terminals and clock drivers.
Either of those would certainly satisfy the 1965 aspect.
Or is the restriction on "negative resistance devices"?
Cheers,
Chuck
20 Dec
20 Dec
3:01 p.m.
On Dec 20, 2007, at 1:29 PM, Chuck Guzis wrote:
I'd love to find a huge stash of a few thousand new-old-stock tunnel
diodes. :-(
-Dave
--
Dave McGuire
Port Charlotte, FL
2) Use
no ICs or other parts that wouldn't have been available
to
hobbyists ca. 1965.
Well, if you put no limit on the number of diodes (just 3 terminal
devices), you can go a heckuva long way using tunnel diodes or even
diacs. 
3:14 p.m.
Dave McGuire wrote:
On Dec 20, 2007, at 1:29 PM, Chuck Guzis wrote:
I'd love to find a huge stash of a few thousand new-old-stock tunnel
diodes. :-(
-Dave
--
Dave McGuire
Port Charlotte, FL
You Sir, are a maniac.
2)
Use no ICs or other parts that wouldn't have been
available to
hobbyists ca. 1965.
Well, if you put no limit on the number of diodes (just 3 terminal
devices), you can go a heckuva long way using tunnel diodes or even
diacs. 
21 Dec
21 Dec
9:37 p.m.
On Thursday 20 December 2007 13:29, Chuck Guzis wrote:
It's my understanding (from other lists) that tunnel diodes are pretty hard to
find these days as well...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
From: Robert
Nansel <bnansel at bigpond.net.au>
1) To build a complete functional computer, including memory,
using no more than 256 2N2222-ish transistors (plus scads of diodes,
resistors, etc.).
2) Use no ICs or other parts that wouldn't have been available to
hobbyists ca. 1965.
Well, if you put no limit on the number of diodes (just 3 terminal
devices), you can go a heckuva long way using tunnel diodes or even
diacs.
6211
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6213
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