Singlestepping

Unknown

HOW/CAN i put the processor in a mode where it issues an interrupt every time it has completed 1 intruction? Or maybe a BIOS or dos call that can do this?

Peter

Unknown

This time it's much easier!

Just set bit 8 of the flag register and every time an instruction has been executed interrupt 1 is called.

example:

pushf

pop ax

or ax,0100h ;set bit 8

push ax

popf

;tracing mode is now enabled

nop ;int 1 will be called the first time after this instruction

nop

nop

pushf

pop ax

and ax,0FEFFh ;reset bit 8

push ax

popf

;trace mode is now disabled

don't forget to change the int1's vector to your own int1 routine!