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Onboard I/O
Universal Peripheral Controller
The Excalibur PCI motherboard has an SMC FDC37C665 Universal Peripheral Controller that supports up to two
floppy drives (360 KB, 1.2 MB, 720 KB, 1.44 MB, or 2.88 MB), two serial ports (using National Semiconductor
16C550s), and one parallel port with ECP (Extended Capabilities Port) and EPP (Enhanced Parallel Port) capability.
Onboard PCI IDE Support
The onboard IDE is on the PCI bus. The IDE controller supports IDE Mode 0, Mode 1, Mode 2, and Mode 3. It also
supports IDE read data prefetch and write posting. The AMIBIOS supports 32-bit data transfers as well as the following
cycle times for each IDE Mode.
PCI IDE Support on the PCI Expansion Slots
PCI IDE adapter cards that require IRQ14 are supported only in PCI Slot1 (P16).
SW1-8 must be set ON to enable IRQ14.
Chapter 3 Specifications
16
IDE Mode
Cycle Time (in nanoseconds)
0
600
1
383
2
240
3
180
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