Power, two USB 1.1 ports, two serial ports (DB-9, RS-232), parallel port (DB-25), Twisted pair Ethernet (TPE0), audio output, and audio input. The PCI slots from top to bottom: Slot 4 is 66 MHz/64-bit. Slots 3 and 2 are 33 MHz/64-bit. Slots 1 and 0 are 33 MHz/32-bit..