Hi Lennart,
I have just such a motherboard: 4xISA, 4xPCI, 2xDIMM+4xSIMM sockets, AT-PSU, Intel 430VX chipset, 512KB cache, USB 1.x, Award BIOS, (Super?) Socket 7, and supports up to 75MHz bus with 3x multiplier (P5-MMX@233MHz). It's a Soltek/Flashtech SL-54A5...