On Monday (03/21/2022 at 09:17PM -0700), Glen Slick via cctalk wrote: > On Mon, Mar 21, 2022 at 8:25 PM Chuck Guzis via cctalk > <cctalk@classiccmp.org> wrote: > > > > The PROMs are most likely house-labeled Intel commodity parts with > > JEDEC-standard pinouts, so it should be fairly easy, using an EPROM > > reader, to figure out if these are 8KB, 16KB, 32KB or 64KB devices. > > Some device programmers can read the manufacturer and device ID codes > from a device, if they are implemented. That would be another way to > check for a Intel standard part.
[...] > > Intel 27256 - 89h / 04h > Intel 27C256 - 89h / 8Ch [...] Trying not to hijack the thread too much but I have an Intel D27C256-200 here in my TL866II+ programmer and it returns ID 89h / 8Dh. The TL866+software actually fails to program it if the "Check Id" feature is enabled as it complains about ID mismatch. But if I disable that, it programs correctly and works in-circuit without issue. Without disabling the Id check, there would be no way to program an Intel 27256 on this programmer since there are no other 256K-bit Intel offerings in the menu-- so I am suspecious of the situation. Any idea why some Intel 256K-bit PROMs are 89/8C and some are 89/8D?? Chris -- Chris Elmquist
