Technical information

Opto DIO48 OPTO DIO Reference
Figure 2-7. The IRQ Jumper Block._______________________________
11111
54210234567 NORMAL USE OF INTERRUPT.________________________
IRQ2 EGA/VGA GRAPHICS CARD, Usually Free
Used by only very few graphics cards.
IRQ3 COM 2- COM 8.
IRQ4 COM 1.
IRQ5 PRINTER PORT#2 OK for DOS & Windows
Avoid for OS/2, Windows NT & Novell
IRQ6 FLOPPY DISK DRIVE, AVOID!.
IRQ7 PRINTER PORT#1 OK for DOS & Windows
Avoid for OS/2, Windows NT & Novell
IRQ10 Usually Free
IRQ11 Usually Free
IRQ12 POINTING DEVICE, Usually Free
Free when mouse is on a COM port.
IRQ15 Usually Free
Note: IRQ0, 1 & 8, timer-keyboard-clock, not on expansion bus.
IRQ9, best left unexplained, is not on expansion bus.
IRQ13, maths coprocessor int, is not on the expansion bus.
IRQ14, Hard Disk drive.
Chapter 2 Page 21