Asus P55SP4 - 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 ГОЕ, including support for up to four
ГОЕ hard disks or other ГОЕ 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 sec­
ondary 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 coimectors
supports four IDE devices in two channels, faster data trans­
fer rates and supports Enhanced IDE devices such as Tape
Backup and CD-ROM drives. The controller supports PIO'
Modes 3 and 4 at a maximum transfer rate of ITMB/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.
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