Interrupt Controllers; Nec Versa 4000 Series Interrupt Level Assignments - NEC VERSA 4000 Service Manual

1-16 Technical Information

Interrupt Controllers

Using interrupts, it is possible to change the code sequence. To change the sequence, reas-
sign the interrupt-levels. Fifteen interrupts can be used with a cascade connection of
8259INTC x 2.
Interrupt-level assignments 0 through 15 are listed in Table Section 1-6, in order of de-
creasing priority.
Table Section 1-6 NEC Versa 4000 Series Interrupt Level Assignments
Controller
Master/Slave
Master
Master
Master
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Master
Master
Master
Master
Master
Priority Name
IRQ00
0
IRQ01
1
IRQ02
2
3 IRQ08
IRQ09
4
IRQ10
5
IRQ11
6
IRQ12
7
IRQ13
8
IRQ14
9
10 IRQ15
11 IRQ03
12 IRQ04
13 IRQ05
14 IRQ06
15 IRQ07
Device
Counter/Timer 1
Keyboard
INT output from controller 2
Real-time Clock
Reserved
Reserved
Reserved)
PS/2 Mouse
Math Coprocessor (built into CPU)
Hard Disk Controller 1
Reserved (second IDE on optional
docking station)
IR Port
Serial Port 1
Reserved (sound)
Diskette Drive Controller 1
Parallel Port 1