X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 01 - internal hardware

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INT 01 - internal hardware - SINGLE-STEP
   generated at end of each machine instruction if TF bit in FLAGS is set
Notes:  this is what makes the T command of DEBUG work for single-stepping
        on 8086 and 8088 CPUs, this interrupt is not generated after a MOV to
          segment register or POP of segment register unless you have a very
          early 8088 with a microcode bug
        on 286 and up CPUs, this interrupt is not generated after a MOV to SS
          or POP SS
SeeAlso: INT 03

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