Specifications 9-7
Interrupt Controllers
Using interrupts, hardware can request software services. If non-Plug and Play software is being
used, the interrupt may need to be moved for software application or driver compatibility. Some
interrupts cannot be moved. Fifteen interrupts can be used with a cascade connection of
8259INTC x 2. The table shows default interrupt level assignments 0 through 15, in order of
decreasing priority.
Priority
Name
Device
0
IRQ00
Internal Timer 1
1
IRQ01
Keyboard
2
IRQ02
PIC
3
IRQ08
Real-time Clock
4
IRQ09
SCI, CardBus, Modem, LAN
5
IRQ10
Video
6
IRQ11
Sound
7
IRQ12
Mouse
8
IRQ13
Coprocessor
9
IRQ14
IDE Controller
10
IRQ15
(Free)
11
IRQ03 or IRQ04
(Free) Infrared Port
1
12
IRQ04 or IRQ03
(Free)
13
IRQ05 or IRQ09
USB
14
IRQ06
(Free)
15
IRQ07
(Free)
1
When enabled.
Summary of Contents for VERSA ULTRALITE
Page 42: ...3 Disassembly and Reassembly Required Tools and Equipment Disassembly Reassembly...
Page 58: ...5 Illustrated Parts Breakdown Illustrated Parts Breakdown Parts List...
Page 65: ...7 Troubleshooting Problem Checklist Startup Problems Diagnostics...
Page 73: ...8 NEC Computers Information Services Service and Support Functions Technical Support...
Page 76: ...9 Specifications System Components Memory Map Interrupt Controllers...