First post, by kuenzign
- Rank
- Newbie
According to Compaq's official Service Quick Reference Guide, the Compaq Portable III has 4 BIOS revisions:
Revision Odd ROM Number Even ROM Number Size
K 106778-002 106779-002 16 KB
N.2 107824-001 107825-001 32 KB
P.2 109737-001 109738-001 32 KB
R.2 109737-002 109738-002 32 KB
I was able to find dumps of Revision K and Revision R.2, but I was unable to find dumps of Revision N.2 and Revision P.2. My Compaq Portable III has Revision P.2, which can be seen in the attached image below. I would like to archive this revision since I haven't found it anywhere, but my MiniPro TL866CS programmer is unable to dump the chips. I believe that this is because the chips are Microchip 27256 EPROMs, which use NMOS technology unlike their counterpart the Microchip 27C256, which uses CMOS technology and can be dumped by the MiniPro. Please correct me on this if I am wrong.
Does anyone know how I might be able to dump these chips? Additionally, does anyone have Revision N.2 so that all BIOS revisions can be archived and preserved?