PCC-8914022 ISA 386 Motherboard, 2MB RAM, Intel A80386DX-16 CPU Tested | eBay
Opti 386 motherboard with Am386 DX-40 processor +RAM | eBay
Tube Time on X: "this is the LARGEST motherboard i have ever seen. it is 15.75 inches by an incredible 20 inches wide! it absolutely dwarfs the more normal 386 motherboard in
USED Mystery Circuit Board 386 Motherboard NEC-16T - GridChoice.com
Seritech SER-386-AD III - The Retro Web
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80386 - What make and model is this 386 mainboard? - Retrocomputing Stack Exchange