type mobo. They were developed to provide a vehicle for a 400 MHz FSB for AMD CPU's when Intel changed to the Slot 1 configuration and wouldn't license it to AMD. They haven't been made for years.
Try pricewatch to see if any are still available, or, of course, eBay.
I want to replace the Pentium mainboard that is running an AMD K6-400 chip. Is there a mainboard that will work? Will I also need to replace the power supply. It is only a 90 watt and might be propriatery (spelling?).