486 Motherboard with 8 MB EDO Ram, 7 ISA slots, intel i486 DX A80486DX-33 CPU - Retro PC Store
TMC PAT48PL (New) 486 motherboard with 8 ISA slots. Baby AT. Can take up to a 486 DX50. 8ISA slots. 8 30Pin SIMM sockets. OPTI F82C206L and OPTI 82C496 B1 chipsets. AMI
Setting up a 486 retro PC - YKM's Corner on the Web
Vintage PC 486 motherboard FIC HC-HD with Intel CPU | eBay