ctrl-alt-rees
Member
Hi All,
I'm currently in the process of trying to see how fast my IBM 5162 can go, but I've run into an issue with BIOS EPROMs.
Firstly I should say that I have a generic AMI BIOS, and it boots fine at speeds up to and including 10MHz (using a 20MHz crystal). But I'd really like to use the leaked "internal use only" 1989 BIOS for this machine as it feels more authentic to me.
I've purchased various 27256 variants, and even though the chips program and verify successfully (using either the original 1986 BIOS or the 1989 BIOS with the extra HDD types and speed restrictions removed) and nothing works!
So as a last ditch attempt and an act of wanton vintage vandalism I dumped, erased and reprogrammed the original - confirmed working - Intel D27256 EPROMs. They are now no longer booting in a completely stock setup.
I'm definitely doing something wrong here but I can't quite work out what. I'm using XGecu Pro (AKA Xgpro) with a TL866 II Plus. I've programmed EPROMs with this setup before with no problems.
The EPROMs always read back and verify OK. They just don't work when I insert them into the 5162 motherboard.
Very confused by all this but I don't have a huge amount of experience in this field so perhaps I'm missing something obvious like a setting somewhere.
TIA.
I'm currently in the process of trying to see how fast my IBM 5162 can go, but I've run into an issue with BIOS EPROMs.
Firstly I should say that I have a generic AMI BIOS, and it boots fine at speeds up to and including 10MHz (using a 20MHz crystal). But I'd really like to use the leaked "internal use only" 1989 BIOS for this machine as it feels more authentic to me.
I've purchased various 27256 variants, and even though the chips program and verify successfully (using either the original 1986 BIOS or the 1989 BIOS with the extra HDD types and speed restrictions removed) and nothing works!
So as a last ditch attempt and an act of wanton vintage vandalism I dumped, erased and reprogrammed the original - confirmed working - Intel D27256 EPROMs. They are now no longer booting in a completely stock setup.
I'm definitely doing something wrong here but I can't quite work out what. I'm using XGecu Pro (AKA Xgpro) with a TL866 II Plus. I've programmed EPROMs with this setup before with no problems.
The EPROMs always read back and verify OK. They just don't work when I insert them into the 5162 motherboard.
Very confused by all this but I don't have a huge amount of experience in this field so perhaps I'm missing something obvious like a setting somewhere.
TIA.