Re: TWGS GAL combos?

["Craig J. Larson" <larson@tcfreenet.org>]

I tried to copy some of the GAL chips some time ago as a backup after the
company went out of business.  It was to no avail.  I have the programmer
and the blank chips, but after you program them, the machine gives you the
option to burn out a security fuse in the chip.  All of the GAL chips from
Applied Engineering had the fuse burned out.  I was unable to emulate the
data and copy the chip.

On 28 Sep 2002, Herbert Fung wrote:

> I was just wondering if it's safe to mix and match GAL chips from a
> few TWGS's
>
> I wanted to try to get an all REV. A onto a board for max
> accelleration purposes.
>
> That being said, I want to make sure that my other TWGS's will work OK
> if I put different mix of revisions in them.
>
> The other question I have is how well are the GAL chips copy
> protected? I've been talking to a friend who tells me that he has
> access to some equipment that can decode copy protection on some chips
> enough to copy the data?
>
> Will this work on GAL chips? Is it safe to try? I'm willing to give it
> a shot if it's safe.
>
> And looking down the road, if I can have the data extracted, who do I
> contact to see if it can be released as freeware? I understand that
> the TWGS firmware was reclassifed as freeware, but I have no idea as
> to whom the permission was given from.
>