DamienC wrote on 2023-12-10, 00:06:
My TL866-II couldn't detect the chip properly, but my GQ-3X detected it as an AMD AM27C256 and I dumped it as that. I can take another look at it tonight, but I'm really reluctant to pull off the sticker to find out. It just looks so damn nice 🤣.
But as a MR. BIOS enjoyer I also want every variant to be out there for the public to be able to try. So I'll check it out again later tonight.
Try dumping it as the AM27C256 with the TL866 too. If the XGPro software doesn't complain about the chip ID, you got it right. No need to remove the sticker then 😀
If the ID is wrong, you could experiment with the ID check button in the XGPro software after selecting AM27C256 . Haven't tried that function myself, so I really don't know what it does, but with any luck it should give you the actual ID as long as you at least select a chip from the same family with the same pin count (read: 28 pins). It's highly likely it's a 27 or 28, or perhaps even a 29 series one.
Regrettably (?) I'm gone skiing for a week more, not having my hardware available. Could check it out and see what possibilities there are identifying unknown parallell (E)EPROMs once I'm back home if you fail to figure it out yourself.