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Chapter 1 Hardware Installation
5
Overview, Continued
BIOS Shadowing The system BIOS is always copied from ROM to RAM for faster execution.
The end user can shadow 16 KB ROM segments from C0000h – DCFFFh.
IDE The Apollo IV motherboard has two 40-pin IDE connectors onboard that
support up to four IDE drives (hard disk drives, CD-ROM drives, or tape
drives). The integrated PCI bus master enhanced IDE controller is on the PCI
local bus. The IDE controller supports the Ultra DMA/33 protocol, which
doubles the hard disk drive data transfer rates specified in the ATA-2
standards to 33 MBs while maintaining full backward compatibility with
existing PIO mode 3, PIO mode 4, and DMA mode 2 devices.
Fast ATA The motherboard supports the Fast ATA specification using PIO mode 4 and
multiword DMA mode 2.
Ultra DMA/33 This motherboard includes an integrated enhanced IDE PCI bus master IDE
controller that supports the Ultra DMA/33 protocol. The Ultra DMA/33
protocol permits data transfer rates up to 33 MBs. Ultra DMA/33 also reduces
the CPU workload and permits increased CPU utilization. Ultra DMA/33 is
completely backward-compatible with older DMA standards.
Floppy The Apollo IV motherboard has an onboard floppy controller that supports up
to two 360 KB, 720 KB, 1.2 MB, 1.44 MB, or 2.88 MB floppy drives.
Parallel Port The Apollo IV motherboard has an onboard ECP and EPP-capable parallel
port connector.
Serial Ports The Apollo IV motherboard has two onboard serial port connectors and two
16550 UART serial ports.
Keyboard The Apollo IV motherboard Includes a standard DIN keyboard connector.
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