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01

Category: CPU-generated
Flags: callout or callback (usually hooked rather than called)

INT 01 - CPU-generated - SINGLE STEP

Desc:	generated after each instruction if TF (trap flag) is set; TF is
	  cleared on invoking the single-step interrupt handler
Notes:	interrupts are prioritized such that external interrupts are invoked
	  after the INT 01 pushes CS:IP/FLAGS and clears TF, but before the
	  first instruction of the handler executes
	used by debuggers for single-instruction execution tracing, such as
	  MS-DOS DEBUG's T command
SeeAlso: INT 03"CPU"

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  Copyright 2000   by Ralf Brown     Updated Jul 2000