Re: A92: learning assembly - real simple question
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Re: A92: learning assembly - real simple question
to clear the upper word only, you can:
rol.l #8,d1
clr.w d1
ror.l #8,d1
ADAMMAN106@aol.com wrote:
> see below
>
> In a message dated 98-07-29 16:31:33 EDT, you write:
>
> > In a message dated 7/29/98 2:09:50 PM Eastern Daylight Time,
> > ADAMMAN106@aol.com writes:
> >
> > > byte: 8 bits
> > > word: 2 bytes: 16 bits
> > > longword: 2 words: 4 bytes: 32 bits
> > >
> > > byte: 256 range
> > > word: 65,536 range
> > > longword:4,294,967,296 range
> >
> > okay then, what is a lower word and an upper word? if l did:
> > clr.w D1
> > which clears the lower word of D1 then what would D1 look like? how would
> l
> > clear the upper word?
>
> sorry, but I don't know any 68K. but say D1 (which I'll assume for the
> purposes of this is a longword (32 bit) register) was 0xFEDCBA98, then the
> result of clr.w D1 would be FEDC0000
> I couldn't tell you how to clear the upper word, sorry
>
> ~Adamman
--
Anton Ivanov
ivanova@ucs.orst.edu
http://www.geocities.com/CapeCanaveral/Hangar/9136
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