That's me :) You can dump it simply using that piece of software http://cd.textfiles.com/microhaus/mhblackbox3/MEMORY/GETROM.ZIP. OK, will do later and share here. Thanks! As for your conclusion, that's a useful piece of information although kinda confusing. I mean, that board should support 33MHz …

Hi folks, Thanks again for the great advice, I wanted to give an update for anyone else who has one of these AT420/AT425/AT433/AT450 boards . In my experience, it works best with a DX2, running at 50mhz. I upgraded it to 32mb of RAM, and got a decent 1MB SVGA card for it. I tried going faster than …

Oh interesting, I wasn't aware of that distinction between DX50 and DX2-50! Given that the motherboard has no jumpers or bios settings related to CPU speed, do you expect a DX2-50 would just be "auto detected" at 50mhz by this board and work?

Hi there, I have a 486 with the Abit AT425 motherboard, you can see the specs here: https://stason.org/TULARC/pc/motherboards/A/ABIT-COMPUTER-CORPORATION-486-AT420-AT425-AT433-AT.html There's very little information online about this motherboard as best I can find. It had an Intel 486 SX25 CPU in it …