Help to copy PAL16 / GAL16 / GAL20 ICs

[Henry]

I'm currently working on a project to "clone" some old computer boards I
have. The companies are long since out of business. These boards are from
around 1983 to 1985.

Please be a little patient with me as I'm not that familiar PAL/GAL ICs and
can use all the advice I can get.

I'm researching in to copying a few of the PAL16 / GAL16 / GAL20 ICs on
these boards. I've been reading that it is possible to "read protect"
(aka - registered) these chips and fear I may run in to this issue.

I'm going to be purchasing an EPROM/PAL/GAL programmer in the near future
and could use some advice on what models and software may be appropriate for
my work. My needs are pretty basic and most of the technology I'll be
working with is from the 1980s. I've been look at an Advin Pilot-MVP, but
fear it may be more programmer then I might need. Any recommendations?

If the PAL16 / GAL16 / GAL20 ICs are "read protected" (aka - registered)
what options do I have to try and reverse engineer these chips? What
options do I have to try and
figure out how these chips are programmed? I have some basic electronics
knowledge, enough to be dangerous, but nothing advanced enough to guide me
with PAL/GAL ICs. Any and all advice will be appreciated.

I'm also looking for someone to help or "tutor" me with these PAL/GAL ICs
and I'd be willing to pay for this service.

You can email me directly at "apl2research -at- comcast.net" or post a
replay
here. Thanks in advance for your help.

Henry

[km]

Henry wrote:

Basically if they are read protected you are stuffed! If someone forgot
to put the read protect on then you can read them and use the code to
programme more. If the boards are complicated and all pins tracke you
will spend many hours trying to figure out what goes on. the only other
option is to work out which ar in and outs and try to build up a truth
table if you cannot access them.

Keith

--

[no one]

this can be done : ( very expensive !! )

http://www.semiresearch.com/

some info : interesting..

http://wiinewz.com/forums/topic/2020-reading-a-protected-pic/

"Henry" <apl2re...@comcast.net> wrote in message
news:4KmdnX2Z8fK...@comcast.com...

[no one]

there are companies that WILL AND CAN read the gal chips by phyisicallu
hacking inti the chip . do a google.

"Henry" <apl2re...@comcast.net> wrote in message
news:4KmdnX2Z8fK...@comcast.com...