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System Resources
The following sections list the available system resources. See the vendor documentation
delivered with an expansion card or a peripheral device for instructions on how to use these
resources.
ISA Bus Interrupt (IRQ) Assignments
IRQ System Resource IRQ System Resource
0 Reserved (interval timer) 8 Real time clock
1 Reserved (keyboard) 9 Open / PIRQ mapping
2 Reserved (interrupt controller) 10 Open
3 Serial port COM2 (default) 11 Open
4 Serial port COM1 (default) 12 PS/2 mouse port
5 Open 13 Reserved (math coprocessor)
6 Floppy disk controller 14 Primary IDE controller or open
7 Parallel port LPT1 (default) 15 Secondary IDE controller or open
Direct Memory Access (DMA) Channels
Channel Assignment Channel Assignment
0 Open 4 DMA controller
1 Open 5 Open
2 Floppy disk controller 6 Open
3 ECP parallel port 7 Open
Input/Output (I/O) Addresses
Address (hex) Description
0000-000F Direct memory access controller 1
0020-0021 Programmable Interrupt controller 1
0040-0043 System timer
0060-006F Standard 101/102-key or Microsoft Natural keyboard
0070-0071 Real time clock
0080-008F Direct memory access page register
00A0-00A1 Programmable interrupt controller 2
00C0-00CF Direct memory access controller 2
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