XCHG instruction: load register AX with a 1

From: "2005" <uws2003@xxxxxxxxx>
Date: 28 Nov 2006 12:21:28 -0800

Hi

In the XCHG instruction, why would be load register AX with a 1 prior
to excution of XCHG - is this
- to insure that the "Flag" variable will be set to 1 after the XCHG or
- the XCHG instruction will not work unless a 1 is loaded into AX
before executing the XCHG instruction ?

Thanks

.

Follow-Ups:
- Re! XCHG instruction: load register AX with a 1
  - From: Wilco Dijkstra
- Re: XCHG instruction: load register AX with a 1
  - From: Isaac Bosompem
- Re: XCHG instruction: load register AX with a 1
  - From: Alison

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