NEC VERSA 2205C, Manual

Page: 77 / 89

B-6 Specifications and Environment
Interrupt Controllers
Using interrupts, it is possible to change the code sequence.
To change the sequence, reassign the interrupt levels. Fif-
teen interrupts can be used with a cascade connection of
8259INTC x 2. The table shows interrupt level assignments
0 through 15, in order of decreasing priority.
CONTROLLER
MASTER/SLAVE
PRIORITY
NAME
DEVICE
Master 0 IRQ0 Timer 1 counter 0
output
Master 1 IRQ1 Keyboard (Output buffer
full)
Master 2 IRQ2 INT output from
controller 2
Slave 3 IRQ8 Real time clock
Slave 4 IRQ9 Reserved
Slave 5 IRQ10 Reserved
Slave 6 IRQ11 Reserved
Slave 7 IRQ12 Mouse
Slave 8 IRQ13 (Co-processor)
Slave 9 IRQ14 Hard disk controller 1
Slave 10 IRQ15 Reserved
Master 11 IRQ3 Serial port 2 (Internal
Fax/Modem)
Master 12 IRQ4 Serial port 1
Master 13 IRQ5 Reserved
Master 14 IRQ6 Floppy disk controller 1
Master 15 IRQ7 Parallel port 1