Technical information

OPTO DIO Reference Opto OUT24
IRQ service routine to patch the appropriate software interrupt.
Figure 5-7. 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
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