egrath wrote on 2026-02-11, 13:57:

Hi, […]
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Hi,

I recently updated my Asus P55T2P4 (Revision 3.10) from Award BIOS to MR-BIOS 3.46. Since then the system has problems detecting the PS/2 mouse. It often needs a few warm-resets for the Mouse driver to detect the attached mouse. Flashing back to Award BIOS (4.51 PG) immediately resolves the issue.

It does not matter which mouse driver I use, tried a few different ones and all have the same problem (Logitech MouseWare 7.2, PTS-DOS Mouse Driver, Genius Mouse Driver, A4Tech Mouse Driver, CTMouse). I'm running on DOS 6.22.

Details about the whole system:
- Asus P55T2P4 Revision 3.10 with Pentium 133 installed
- 32 MB EDO DRAM
- ATI 3D Rage Pro PCI
- Unknown ES1868 based ISA sound (PnP)
- Intel PRO/10 Ethernet ISA card (PnP)

However, as I desperately want to run MR-BIOS on this board, is there anything I can do about it? Maybe some setting in the BIOS which causes this behavior?

With kind regards,
Egon

Yeap I got same glitch with Mr.BIOS on Pentium based Intel motherboards. Never investigate it deep. Maybe something with IRQ12 reservation or conflict.