E
Eric Smith
- Jan 1, 1970
- 0
Ray Andraka wrote about reverse-engineering ASICs based on behavior vs.
analyzing the mask layout:
Speaking of such things, I have a number of old chips from which I want
to extract masked ROM and PLA contents from. Since those are very
regular strutures, and they in parts with single layer metal in 5 micron
and larger geometry, it should be fairly easy. In fact, here's an
example of someone doing this:
http://www.pmonta.com/calculators/hp-35/
He extracted code from 10 micron PMOS masked ROMs that were packaged in
metal cans, by the simple expedient of removing the top of the can with
a dremel tool or the like.
I want to do basically the same thing with other chips from that era,
but they're in plastic DIP packaging. I don't want to mess with
high-temperature fuming nitric acid and such things. Can anyone
recommend a lab that will do this, and take photomicrographs, at
a "reasonable" price?
Before everyone jumps on me about piracy, I'll explain that the ROM
and PLA code in question is NOT copyrighted.
Thanks!
Eric
analyzing the mask layout:
it may take a bit of work to ferret out all the operation, but it is
likely still easier than trying to reverse engineer from masks.
Speaking of such things, I have a number of old chips from which I want
to extract masked ROM and PLA contents from. Since those are very
regular strutures, and they in parts with single layer metal in 5 micron
and larger geometry, it should be fairly easy. In fact, here's an
example of someone doing this:
http://www.pmonta.com/calculators/hp-35/
He extracted code from 10 micron PMOS masked ROMs that were packaged in
metal cans, by the simple expedient of removing the top of the can with
a dremel tool or the like.
I want to do basically the same thing with other chips from that era,
but they're in plastic DIP packaging. I don't want to mess with
high-temperature fuming nitric acid and such things. Can anyone
recommend a lab that will do this, and take photomicrographs, at
a "reasonable" price?
Before everyone jumps on me about piracy, I'll explain that the ROM
and PLA code in question is NOT copyrighted.
Thanks!
Eric