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Pedion System Resources
I/O Address map
You can change the settings used
by the serial, parallel and infrared ports with the BIOS Setup utility.
| Address |
Device |
| 000 – 00F |
DMA controller 1 |
| 020 – 021 |
Interrupt controller 1 |
| 040 – 043 |
System timer |
| 060 |
Keyboard |
| 061 |
System speaker |
| 064 |
Keyboard |
| 070 – 071 |
Real time clock |
| 081 – 08F |
DMA page register |
| 0A0 – 0A1 |
Interrupt controller 2 |
| 0C0 – 0DF |
DMA controller 2 |
| 0F0 – 0FF |
Numeric data processor |
| 170 – 177 |
CD-ROM select |
| 1F0 – 1F7 |
Hard disk select |
| 201 |
Joystick |
| 220 – 22F |
Audio (default) |
| 274 – 277 |
ISA Plug & Play |
| 2F8 – 2FF |
Infrared port (COM2) |
| 330 – 331 |
MPU-401 port |
| 376 |
CD-ROM select |
| 378 – 37F |
Parallel port |
| 388 – 38B |
FM synthesizer |
| 3B0 – 3BB |
Video subsystem |
| 3C0 – 3DF |
Video subsystem |
| 3F0 – 3F5, 3F7 |
Diskette drive controller |
| 3F6 |
Hard disk select |
| 3F8 – 3FF |
Serial port (COM1) |
| CF8 – CFF |
PCI configuration register |
IRQ table
You can change
the interrupt used by the serial, parallel and infrared ports with the BIOS Setup utility.
| Priority |
IRQ |
Cause of Interrupt |
| 1 |
SMI |
Power management unit |
| 2 |
NMI |
Parity error, I/O channel error |
| 3 |
IRQ0 |
Timer, Counter 0 output |
| 4 |
IRQ1 |
Keyboard |
| IRQ2 |
Cascade connection from interrupt controller 2 |
| 5 |
IRQ8 |
Real time clock |
| 6 |
IRQ9 |
CardBus controller, PCI-to-USB Universal Host
Controller and NeoMagic MagicGraph 128XD |
| 7 |
IRQ10 |
Reserved |
| 8 |
IRQ11 |
Reserved |
| 9 |
IRQ12 |
Mouse |
| 10 |
IRQ13 |
Co-processor |
| 11 |
IRQ14 |
Hard disk controller |
| 12 |
IRQ15 |
CD-ROM drive controller |
| 13 |
IRQ3 |
Infrared port @ 2F8h (factory default) |
| 14 |
IRQ4 |
Serial port @ 3F8h (factory default) |
| 15 |
IRQ5 |
Audio (factory default) |
| 16 |
IRQ6 |
Diskette drive controller |
| 17 |
IRQ7 |
Parallel port @ 378h (factory default) |
DMA channels
The parallel port
in ECP mode requires either DMA1, DMA2 or DMA3. The infrared port in IrDA 1.1 Fast
Infrared (FIR) mode requires either DMA1 or DMA3.
DMA requirements mean that the Pedion cannot use the diskette drive and
the FIR, ECP and audio features at the same time. If necessary, you can use the BIOS Setup
utility to disable the diskette drive and free DMA2. The audio system requires DMA1 and
DMA3 and cannot be disabled.
| Channel |
Function |
| 1 |
Audio |
| 2 |
Diskette drive |
| 3 |
Audio |
| 4 |
DMA controller |
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