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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 Assignment IRQ Assignment
0 Reserved (timer/counter) 8 Reserved (real-time clock)
1 Reserved (keyboard controller) 9 USB or Windows Sound
2 Reserved (interrupt controller) 10 LAN
3 Serial ports COM 2/COM 4 11 SCSI
4 Serial ports COM 1/COM 3 12 PS/2 mouse
5 Sound card or parallel port LPT 2 13 Reserved (math coprocessor)
6 Reserved (floppy drive controller) 14 Primary IDE
7 Parallel port LPT 1 15 Secondary IDE
Direct Memory Access (DMA) Channels
DMA Channel Data Width Assignment
0 8b or 16b Open
1 8b or 16b Second choice of ECP parallel port
2 8b or 16b Floppy drive controller
3 8b or 16b First choice of ECP parallel port
4 NA DMA controller to cascade channel
5 16b Open
6 16b Open
7 16b Open
Input/Output (I/O) Addresses
I/O Address (hex) Size Assignment
0000 – 000F 16 bytes DMA controller 1
0020
−
0021
2 bytes Interrupt controller 1
0040 – 0043 4 bytes Timer/counter 1
0048 – 004B 4 bytes Timer/counter 2
0060 1 byte Keyboard controller
0061 1 byte NMI and speaker
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