Re: GALs and old PCBs


"matt" <mattgyma@xxxxxxxxxxx> schreef in bericht
news:43fb35cf.344841562@xxxxxxxxxxxxxxxxxxxxx
On Tue, 21 Feb 2006 16:11:14 +0100, "Deefoo" <nonono@xxxxxxxxxxxx>
wrote:


-25 is for speed, not for age ;o)

I know that. :-)

There is no reason to assume that your GAL would be of the right speed for
a
25 year old PCB. Your GAL may be too fast or too slow. Don't you have the
original GAL?

No - the original chip was an 82S153 PLD, it's just that someone
converted the contents of that to JEDEC format to work with a modern
GAL (82S153's are hard to find and expensive). It worked for him, just
can't figure out why it won't work for me.

So perhaps I should buy and try a faster GAL? -15 perhaps? -10? -7?

Maybe. But I'd be mistrust the conversion in the first place. Do you have
the JEDEC of the original 82S153? If memory serves, AMAZE can convert the
JEDEC back to logic equations so you can see what it is supposed to do. Once
you know that you can edit the source for a GAL and get the right JEDEC for
it.

petrus bitbyter


.

Relevant Pages

  • Re: GALs and old PCBs
    ... But I'd be mistrust the conversion in the first place. ... JEDEC back to logic equations so you can see what it is supposed to do. ... differ for the same component type but other manufacturer. ... I'm afraid. ...
    (sci.electronics.basics)
  • Re: GALs and old PCBs
    ... But I'd be mistrust the conversion in the first place. ... Afraid not, no.:( ... JEDEC back to logic equations so you can see what it is supposed to do. ...
    (sci.electronics.basics)