Figure 2-3. The Irq Jumper Block - Brainboxes IE-285 User Manual

PC Elite Reference
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Figure 2-3. The IRQ Jumper Block.

1 1 1 1
5 2 1 0 2 3 4 5 6 7
Note: IRQ0 & 8, timer & clock interrupts, not on expansion bus.
IRQ1, keyboard interrupt, is not on the expansion bus.
IRQ9, best left unexplained, is not on the expansion bus.
IRQ13, maths coprocessor int, is not on the expansion bus.
2-14
________________________ NORMAL USE OF INTERRUPT.
IRQ2 EGA/VGA CARD, Usually Free
Used by only very few graphics cards.
IRQ3 COM 2
Avoid if COM2 Installed!
IRQ4 COM 1.
Avoid if COM1 Installed!
IRQ5 PRINTER PORT#2 OK for DOS, Windows
Avoid for OS/2, Windows 95, NT & Novell
IRQ6 DISK DRIVE STATUS, AVOID!.
IRQ7 PRINTER#1 OK for DOS & Windows
Avoid for OS/2, Windows 95, NT & Novell
IRQ10 Usually Free
IRQ11 Usually Free.
IRQ12 POINTING DEVICE
Free when mouse is on a COM port.
IRQ15 Usually Free
Installation Guide
_______ DEFAULT
PC2 Mode Only.
PC2 Mode Only.
PC2 Only.
PC2 Mode Only
Chapter 2