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X-Hacker.org- Assembly Language - <b>int 01h (1) single step</b>
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INT 01h (1) Single Step
Generated after each instruction if the Trap Flag (TF) of the CPU is
set.
The Trap Flag (TF) is turned off when any type of interrupt is
executed. Therefore, single stepping will not occur within the INT 01h
handler. After the INT 01h handler is exited, the flags are restored
and single stepping will continue.
Debuggers such as DEBUG use this service to single-step through
instructions.
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