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5-6 Hardware Specifications Rev.A
Confidential
System Interrupts
The system provides two cascade connections to 8259A-equivalent interrupt controller and
carries 15 levels of interrupts, besides
NMIs.
Table 5-3 shows the application for each interrupts.
However, you can change the serial and parallel interrupts from the BIOS setup program or Plug
& Play function.
*1: It cannot be changed when the device is in use, but can be cleared when not in use.
*2: IRQ15 is assigned in the secondary IED, but not used in SR-600.
Table 5-3 System interrupts
Controller 1 Controller 2 Application
Can be
changed
IRQ0 Timer
✕
IRQ1 Keyboard
✕
IRQ2 Controller 2 cascade
✕
IRQ8 RTC
✕
IRQ9 Not used O
IRQ10 Serial port 4 O
IRQ11 Serial port 3 O
IRQ12 Mouse O
IRQ13 Numerical operation co-processor
✕
IRQ14 Hard disk controller (Primary)
▲
*1
IRQ15 Hard disk controller (Secondary)
▲
*2
IRQ3 Serial port 2 O
IRQ4 Serial port 1 O
IRQ5 Not used O
IRQ6 Floppy disk controller
✕
IRQ7 Parallel port 1 O
NMI I/O error check
✕