486DX4 / Pentium Overdrive. Got the computer from a friend (it was headed to the dumpster =C ). Case was beat up, so I put it in a modern case.
100mhz 486DX class CPU
64mb RAM - 4mb S3 Video
10/100 3com Ethernet
Heavily customized MS-DOS 6.22
Soldered components to motherboard for PS/2 connectors.