Interrupt Controllers - NEC Versa 2600 Series Service Manual

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Interrupt Controllers

Using interrupts, it is possible to change the system's code sequence. To change the se-
quence, reassign the interrupt-levels. Fifteen interrupts can be used with a cascade connec-
tion of two 82C59 interrupt controllers.
Interrupt-level assignments 0 through 15 are listed in Table Section 1-4, in order of
decreasing priority. These assignments can be adjusted by PnP function.
Table Section 1-4 Interrupt Controllers
Controller
Master/Slave Priority
Master 1
Master 2
Master 3–10
Slave 4
Slave 5
Slave 6
Slave 7
Slave 8
Slave 9
Slave 10
Master 11
Master 12
Master 13
Master 14
Master 15
Master
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Technical Information
Name Device
IRQ00 System Timer
IRQ01 Keyboard
IRQ02 Second Interrupt Controller
IRQ03 PCMCIA Modem Card (default)
IRQ04 COM1 (Internal serial port)
IRQ05 Sound Chip, MIDI (default)
IRQ06 Floppy Disk Drive Controller
IRQ07 LPT1 Default (internal printer port)
IRQ08 Real Time Clock
IRQ09 MIDI
IRQ10 Not used
IRQ11 Not used
IRQ12 Internal Glide Pointer or External PS/2 Mouse
IRQ13 Co-Processor
IRQ14 Hard Drive
IRQ15 CD-ROM
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