Re: Billy Pettit real disappointment

>From: "Chuck Guzis" <cclistsydex.com>
>
>On 29 Jun 2007 at 1:08, Brent Hilpert wrote:
>
> > Core logic is quite a different form of gate
implementation than what we
> > normally deal with, the static state of the
network is represented by 
>the
> > magnetic field of the cores (not by DC voltage
levels at gate outputs) 
>and it
> > requires AC activity into the cores to propagate
changes through the 
>network.
>
>Bitsavers has the operations manual and complete
schematics for the
>SS-80 with a really good explanation of how these things
work.  If
>you're used to semiconductor logic, core logic is *very*
different.
>If you consider other machines of the time and that the
entire logic
>power came from the clock signal, 6 4X150s (at what,
250W plate
>dissipation per the each?) wasn't bad at all.
>
>It'd be fun to see if the large cores for this type of
logic could be
>obtained to experiment with this logic type again.
>
Hi
If this is the logic I'm thinking of, the clock is needed to
keep the state
of the data through the cores and also provide amplification
power
to propagate the data.
The principle was that the cores could take on one of two
phase states,
representing 1/0. It used the non-linear saturation of the
cored to make
a divide by two. Since the divide can happen on either the
first or the
second cycle of the input clock, there were two states.
Amplification
happen because the cores windings were connected to a
capacitor.
multiple cycles would increase the aplitude. The output was
just two
wires so one could also create inversions. Logic was created
by summing
inputs from input data.
This logic was very reliable being magnetic material. Unlike
tubes that
could occationally give incorrect answers. As long as it had
enough
clock signal it would be fine ( 4X150's ).
There was someone on the list ( as I recall ) that had one
of the
experimenter kits with this logic in it.
Dwight

____________________________________________________________
_____
Hotmail to go? Get your Hotmail, news, sports and much more!

http://mobile.msn.com