IBM PC MMX Pentium HS-4500, Manual, Page: 41 / 51

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4.5 Integrated Peripherals
The IDE hard drive controllers can support up to two separate hard
drives. These drives have a master/slave relationship which is
determined by the cabling configuration used to attach them to the
controller. Your system supports two IDE controllers--a primary and
a secondary--so you can install up to four separate hard disks.
PIO means Programmed Input /Output. Rather than having the
BIOS issue a series of commands to affect the transfer to or from the
disk drive, PIO allows the BIOS to tell the controller what it wants and
then let the controller and the CPU perform the complete task by
them. This is much simpler and more efficient (also faster).
ROM PCI/ISA BIOS (2A5KKD29)
INTEGRATED PERIPHERALS
AWARD SOFTWARE, INC.
On-Chip Primary Mode : Enabled
Master PIO : Auto
Slave PIO : Auto KBC clock source : 8 MHz
Master UDMA : Auto Onboard FDC Controller : Enabled
Slave UDMA : Auto Onboard UART Port 1 : 3F8/IRQ4
Onboard UART Port 2 : 2F8/IRQ3
IDE HDD Block Mode : Enabled Onboard Parallel Port : 378/IRQ7
On-Chip USB Controller : Disabled Parallel Port Mode : ECCEPP 1.9
ECP Mode Use DMA : 3
Init Display First : PCI Slot Onboard IrDA Port : Disabled
Ring/Wake On LAN Control : Disabled
RIC Alarm Controller : Disabled Onboard Serial Port 3 : 3E8
Serial Part 3 Use IRQ : IRQ3
Onboard Serial Port 4 : 2E8
Serial Port 4 Use IRQ : IRQ3
LCD Panel Type : Panel 5