16 Dec
2001
16 Dec
'01
9:42 a.m.
The older large ferrite core is easier to work with though
much slower. The bigger cores produce a larger output
when they switch but the cycle times are in the
3-5uS range. The later is helpful for demos as nothing
is too fast.
Allison
-----Original Message-----
From: Loboyko Steve <sloboyko(a)yahoo.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Saturday, December 15, 2001 11:36 PM
Subject: Re: [PDP8-Lovers] how to clean a PDP8/A, dishwasher?
I've looked into this too. Problems are many.
It's
definitely not a trivial project, lots of analog and
electromagnetic voodoo, and the chips that made it
easier are very hard to find. I've got a small
capacity large doughnut ca. 1960 core plane from an
IBM machine and a 4K by 16 plane from the 70's with
very tiny doughnuts, both unused, and I'd love to
demonstrate how it worked.
--- ajp166 <ajp166(a)bellatlantic.net> wrote:
From: John Allain <allain(a)panix.com>
__________________________________________________
Do You Yahoo!?
Check out Yahoo! Shopping and Yahoo! Auctions for all of
your unique holiday gifts! Buy at http://shopping.yahoo.com
or bid at http://auctions.yahoo.com I have a Question for the other core users out
there:
How would I test-signal a board, for demos, that
is
just a core frame, IE one sacrificed from its stack
and sold at the e- flea market?
It's a non trivial thing to do. Core by definition
is destructive
read out memory. So to demo a core you need to
provide
the coincident current (x,y) and the
inhibit/write/read signals
with the associated timing. Both the currents and
the
timing are critical. takes a lot of stuff to do
that.
Allison