Ozzuneoj wrote on 2019-01-20, 01:46:
Yearly bump.
Still looking for anyone who has the ability to program an 8748 with the firmware attached to my previous post. PM me if you have the ability to do this. Also, as before, any other suggestions to fix the problem would be nice.
Hello,
I've faced the same problem, my IBM F XT Personal Computer keyboard has failed. All the clues show that the controller is a culprit.
Thank you for the ROM image. Also, I've obtained another one. I was said it was grabbed from the UK version of the keyboard; and it turned out two images are absolutely the same. So, probably, yours is of the UK version, too.
Anyway, I'm going to program the controller with this ROM. I've found a Moscow guy who has chips for sale, and is agree to program them on demand. The chips are not genuine Intel D8748H, but their Russian clones, KM1816BM48. Functionally, clones are absolutely the same, but, according to Soviet standards, the distance between legs is a bit shorter (2.5mm vs. 2.54mm). So, for 20 legs the furthermost one will be .76mm off-center. It's quite much, but, acting accurately, it's possible to fit the Soviet chip into the footprint of the standard one. I've done it before, and it's totally doable.
If you wish, I can send you the programmed chip by mail, just let me know.
Sincerely yours,
Peter, Russia