Re: For the TWGS and The Zip cards

[dempson@actrix.gen.nz (David Empson)]

ToasterKing <ToasterKing@mindlessPLOP.com(Delete"PLOP"toreply)> wrote:

> Howdy-doo there!  I've been wondering this for quite some time now...
> How involved would it be to take the existing design of each GAL and
> modify it, in order to produce copies of the GAL chips that do not have
> ANY of the traps that are no longer needed, since having the traps slows
> down processing?

The million dollar question for this is whether anyone has the source
file for the GAL.  In 99% of the cases I've encountered, PALs, GALs and
the like have a protection mechanism that prevents their internal logic
being read back by the programmer, after a protection fuse is blown.

We use OTP and Flash PALs at work, and both types have this feature.
Our programming software automatically blows it unless you do each
programming step manually (blank check, program, verify).

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand