I''m following one of LaMothe''s older books (Black Art of 3D, and TGPG ) and in Black Art he writes a keyboard driver. Well, I thought I''d follow along, but am getting compiler errors about _dos_setvect. It goes as follows // holds old keyboard interrupt handler void ( _interrupt _far* Old_Keyboard_ISR )(...); ... _dos_setvect( KEYBOARD_INTERRUPT, Old_Keyboard_ISR ); ERROR: Cannot convert ''void(*)(...)'' to ''void (interrupt *)(...)'' I had similiar problems with _dos_getvect and _dos_setvect with my own Keyboard driver, but I can''t seem to fix this one. I''ve tried casting like this _dos_setvect( KEYBOARD_INTERRUPT, ( void (interrupt *)(...))Old_Keyboard_ISR ) but that doesn''t work. I''m using Borland C++ 5.02 if that matters. Thanks for any suggestions. Ut

You must declare the interupt function to be a interupt function try:

void interrupt Function()
{
}
instead of this
void Function()
{
}

Since there is some things that is done in a diffrent way with interupt functions the compiler must know that it´s a interupt function
ex. return from a standard function is ret while from a interupt iret

Yes. What you said works. My problem comes in trying to reload the old keyboard driver. The only way (I know of) is to save it off in a function pointer. When I try to use this function pointer to reset the driver, _dos_setvect complains about getting an improper type. I''ve tried to cast it to the correct type, but "interrupt" is invisible to the cast.

Ut

quote: Original post by MatsG

You must declare the interupt function to be a interupt function try:

void interrupt Function()
{
}
instead of this
void Function()
{
}

Since there is some things that is done in a diffrent way with interupt functions the compiler must know that it´s a interupt function
ex. return from a standard function is ret while from a interupt iret