Checksums are hexidecimal summations of the binary content of a programmed
memory device such as a ROM. They are useful for a quickie check to see
if the chips you have are possibly bad or different. I say possibly bad
because there are a few exceptions....
I've made a recent discovery that I cannot explain but it may help some
of you struggling with potentially bad EPROMs. For some reason with
older eproms I can get a valid read if I power the board/EPROM with a lower
voltage, much lower like 3.75VDC.
Chips may read good but not work in circuit under operating conditions
(at least you can usually get a valid read to make a good copy of)
Chips may have the same checksum but actually be slightly different in
There are several formats of storing/tracking the data contained in
chips including Intel Hex, Binary, Motorola S, JEDEC. Binary code is the
format I prefer and seems to be the most common among all device programers.
The following pages are a collection of checksums that I've collected.
If you find any errors or discrepancies please contact me.
Note that you cannot click on the e-mail address you must type it in
(Spam is horrible now), please also include "PAC-MAN" in your subject line
to help me sort the garbage out.
Video Game Chip Checksums
Pinball Chip Checksums
Last updated July 3, 1998