Detecting the status of the A20 line. 
Author Message
 Detecting the status of the A20 line.

Quote:


> > Can someone tell me why this peice of code does not return the
> > correct status of the A20 line.

> > If the A20 line is disabled, then the carry flag should be clear
> > on return. Otherwise, the carry flag is set (A20 is Active).

> [...]

> >                 rep     cmpsw

> shouldn't that be        repe   cmpsw ???

> [...]

> later

> Wuschel

Hi. It's me again. (Pete)

        (rep   cmpsw) and (repe   cmpsw) produce the same opcode.

Thanks anyway.

Pete



Wed, 28 Apr 1999 03:00:00 GMT  
 Detecting the status of the A20 line.

Quote:

> Can someone tell me why this peice of code does not return the
> correct status of the A20 line.

> If the A20 line is disabled, then the carry flag should be clear
> on return. Otherwise, the carry flag is set (A20 is Active).

[...]

Quote:
>                 rep     cmpsw

shouldn't that be        repe   cmpsw ???

[...]

later

Wuschel



Thu, 29 Apr 1999 03:00:00 GMT  
 
 [ 2 post ] 

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