Interrupt Controllers - NEC VERSA 2600 Service Manual

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
Master
Master
Master
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Master
Master
Master
Master
Master
Master
Priority Name
1 IRQ00
2 IRQ01
3–10 IRQ02
4 IRQ03
5 IRQ04
6 IRQ05
7 IRQ06
8 IRQ07
9 IRQ08
10 IRQ09
11 IRQ10
12 IRQ11
13 IRQ12
14 IRQ13
15 IRQ14
IRQ15
Technical Information
Device
System Timer
Keyboard
Second Interrupt Controller
PCMCIA Modem Card (default)
COM1 (Internal serial port)
Sound Chip, MIDI (default)
Floppy Disk Drive Controller
LPT1 Default (internal printer port)
Real Time Clock
MIDI
Not used
Not used
Internal Glide Pointer or External PS/2 Mouse
Co-Processor
Hard Drive
CD-ROM
1-19