ID Number: Q34208
3.x 4.x 5.x
MS-DOS
Summary:
The linker option /O[VERLAYINTERRUPT] allows you to select an
interrupt number other than the default (dec 63, or hex 3F) for
passing control to overlays. Normally, you do not change it, except
when an overlaid program is spawning another overlaid program.
The possible numbers that can use with /O[VERLAYINTERRUPT]:number
are decimal 0 to 255, octal 0 to 0377, and hexadecimal 0
to FF. However, any numbers that conflict with DOS interrupts, though
allowable, should be avoided.
The numbers available without conflict for user-defined overlay
interrupts are decimal 60 through 67.
More Information:
Consult a DOS programmer's reference for current information on the
available interrupts.