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Chapter 4
4.
Resources
This chapter lists and describes system board resources.
ISA Interrupt Requests (IRQs)
Most Industry Standard Architecture (ISA) peripheral devices installed in the system
require you to reserve an interrupt request (IRQ). Peripheral Component Interconnect
(PCI) peripheral devices share system resources and can use the same IRQ. (See
“PCI-to-ISA Interrupt Map” on page 52 in this chapter.) At least one IRQ must be
unassigned for use with your system’s PCI devices.
To reserve an IRQ for an installed peripheral device:
Table 4-1
ISA Interrupt Requests
IRQ
Assignment
IRQ
Assignment
0
Reserved (timer/counter)
8
Reserved (real-time clock)
1
Reserved (keyboard controller)
9
System Management Bus / ACPI
2
Reserved (interrupt controller)
10
PCI
3
Serial ports COM 2 / COM 4
11
PCI
4
Serial ports COM 1 / COM 3
12
PS/2 mouse
5
PCI / Audio
13
Hardware Monitor
6
Reserved (floppy disk controller)
14
Primary IDE
7
Parallel port LPT 1
15
Secondary IDE
Summary of Contents for Zx10
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