13 May
2011
13 May
'11
3:17 p.m.
--- On Fri, 5/13/11, Ethan Dicks <ethan.dicks at gmail.com> wrote:
No, but very cool.? I'm not suggesting uber-tight
packing, but it'd be
interesting to see if that could be tweaked to do maybe 8
or 16 bytes
- that should still be loose enough to run successfully by
hand.
In practice, the hysteresis loop for the cores is not perfectly square. One issue in the
design of core memories is so called "delta noise" introduced on the sense lines
by partial switching of the half-selected cores. Obviously, the effect is greater for
larger planes with more cores per sense wire. Techniques such as "disturb
pulses" were used to mitigate this effect. It sounds like the designers of this
memory did not address this concern, and it is likely that they only got away with it due
to the small size. Just a warning against naively scaling up their design...
--Bill