Hi all, I have installed this XT-CF card in my PS/2 Model 25SX but it won't bring up the option ROM of the card.

I tested and used the card in an AST 486 and it works perfectly in that computer. I installed MS-DOS 6.22 on a 32 MB CF card.

The PS/2 however shows error 161 and 163 (invalid CMOS settings), and when I press F1, it tries to boot from floppy disk and then goes straight to BASIC. No option ROM of the add-on card is shown.

The problem is that the FDD is bad and I am trying to avoid having to repair it. I did replace the CMOS battery but never set the BIOS settings because I can't boot from a diagnostics disk.

Is there anything I'm not aware of with these computers? Should I use different jumper settings on the motherboard or card?

• This is the card I'm using: https://shop.bluelavasystems.com/products/xt- … -slot-8-support
• This describes the motherboard of my computer (K00 is my specific model code): https://www.ardent-tool.com/8525/Planar_SX.html