Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software

[Fred Cisin]

> > keeping things like the DAA instruction intact and supporting a bunch
> > of do-nothing instructions like MOV DL,DL.
> FYI, that most certainly doesn't just "do nothing."  It updates the flags
> based on the contents of the DL register, and you could do a conditional
> jump based on the results.

NO, it doesn't.
But OR DL,DL  or AND DL,DL would.