6502.org

I just stumbled onto this website, which purports to offer a homebrew programmer for Atmel's 16v8 and 22v10 chips: http://www.bhabbott.net.nz/atfblast.html

You need a computer with a parallel port; maybe he'll upgrade it to use USB at some point.

I found that recently, however the real "trick" is knowing the algorithm - the hardware is relatively easy to hook up to e.g. an ATmega (arduino), so it ought to be possible to write the burning code for the ATmega, download the file into it (2K ram - plenty of space) then get it to burn the GAL.

That's my plan, anyway.

-Gordon

What makes these difficult to program? Wacky voltage requirement? Secret undocumented incantations?

They use a serial programming algorithm that isn't publicly documented by Atmel/Microchip, and for some reason, it's not available on cheap programmers.
People have reverse-engineered it, though.

I would use their parts if the information were available. Do you have a link to the reverse-engineered algorithm?

I do, but not on this device. I've posted it before, though. I'll take a look and see if I can find it again.

EDIT: Here you are: https://www.ecstaticlyrics.com/electronics/ATF22V10C/

Thanks. I just now printed it.