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 applicatio n fo r each i nterrupts.

However, you can change the serial and parallel inte rrupts from the BIOS setup program or Plug

& Play function.

*1: It cannot be changed when the device is in use, but can be cleared wh en 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