INT 01 - internal - SINGLE-STEP                        

        Generated  at  end  of each machine instruction if TF bit in
        FLAGS is set. This is what makes the T command of DEBUG work
        for  single-stepping.  It  is  not  generated  after  MOV to
        segment register or POP of segment register (unless you have
        a very early 8088 with a microcode bug).


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