A detailed documentation of a custom-built 486 homebrew computer motherboard (M8SBC-486) featuring a Xilinx Spartan II FPGA as the chipset, 4MB SRAM, ISA slots, and PS/2 keyboard support. The board achieves partial PC compatibility, successfully running Linux 2.2.26, MS-DOS 6.22, FreeDOS 1.4, and some DOS software including
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