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16 system interrupt channels are provided by the NMI of the CPU and two 8259
interrupt controllers in the SIS-85C471-AT-Controller. All interrupts may be
masked. Interrupts are sorted by priority, starting with the highest priority. Table
16 lists all available interrupts:
NMi
Master
IRQ 0
IRQ 1
IRQ 2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
Slave
IRQ 8
IRQ 9
IRQ 10
IRQ 11
IRQ 12
IRQ 13
IRQ 14
IRQ 15
Parity or I/O error
Timer Output 0
Keyboard
Cascading for slave controller
Real-time clock (RTC)
Software redirect to INT 0Ah
available
available
available
Co-processor
Hard disk controller
available
COM2
COM1
available (LPT2)
Floppy disk controller
LPT1
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