Asus P55SP4 P/I-P55SP4 User's manual - Page 8

Feature Guide If you install a cache module in the cache socket, the SRAM sockets are disabled. Cache module options include 256KB, 512KB or 1MB of Pipelined SRAM. • Three 16-bit ISA and four 32-bit PCI expansion slots, with one shared slot position. The PCI slots are Bus Master capable. In addition to supporting standard PCI cards, the PCI4 slot also has a proprietary slot extension which combines with it to form the proprietary ASUSTek MediaBus slot. • BIOS support for Power management and "Plug and Play" features and Enhanced IDE, including support for up to four IDE hard disks or other IDE devices and hard disks larger than 528MB and up to 8.4GB. Auto detection of installed IDE hard disk drives via a utility built into the BIOS. • On-board 'Multi-I/O' using the NS 87C334 multi-I/O chip: 2 serial ports, 16550 Fast UART compatible;1 parallel port with EPP and ECP capabilities; all configurable as primary or secondary COM and LPT ports; the second UART can support an IrDA-compatible infrared port module attached to the 5-pin onboard connector, instead of the COM2 port; the floppy disk drive controller supports drives up to 2.88MB capacity • On-board PCI Bus Master IDE controller with two connectors supports four IDE devices in two channels, faster data transfer rates and supports Enhanced IDE devices such as Tape Backup and CD-ROM drives. The controller supports PIOModes 3 and 4 at a maximum transfer rate of 17MB/second and Bus Master IDE DMA Mode 2 at maximum 22MB/second. • Optional IrDA infrared port module and external PS/2 port connector. • On-board NCR SCSI BIOS firmware supports the optional PCI SC-200 SCSI controller card. 1 - 3