Socket 7 at ecs p5tx-bpro rev 2.0a intel cpu 133mhz(430tx), tested working MANUAL https://theretroweb.com/motherboard/manual/p5tx-bpr-5f0e4c8e63cd9337906769.pdf https://theretroweb.com/motherboard/manual/34634.pdf 1x  AT Keyboard 1x  Floppy interface 2x  IDE interface 1x  PS/2 mouse 1x  Parallel 2x  Serial 2x  USB 1.x 3x  16-bit ISA 4x  32-bit PCI