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From: acmfiu@serss0.fiu.edu (ACMFIU)
Newsgroups: comp.sys.apple2
Subject: Re: sideaffect of MVN/MVP instruction
Message-ID: <3694@kluge.fiu.edu>
Date: 31 May 91 02:44:31 GMT
References: <9105300228.AA00543@mcs.drexel.edu>
Sender: news@kluge.fiu.edu
Organization: Florida International University, Miami
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In article <9105300228.AA00543@mcs.drexel.edu> ujmurphy@KING.MCS.DREXEL.EDU (Jim Murphy) writes:
}albert recently asked:
}
}}someone want to explain to me why the MVN/MVP instructions don't restore
}}the data bank register? (yes, i'm moving data in different banks).
}
}     Well, because they don't. The instruction set reference plainly states
}that the data bank register holds the destination bank value when these
}instructions are finished. If you'd look at the detailed instruction operation
}listing in the '816 data sheet, you can see it there too. Is a PHB/PLB sequence
}too difficult?
}
}Jim Murphy                             "I know that you believe you understand
}Internet:  ujmurphy@mcs.drexel.edu     what you think I said. But I am not sure
}GEnie:     J.MURPHY7                   you realize that what you heard is not 
}AOL:       Jim Murphy                  what I meant."

no, a phb/plb sequence is not difficult. you have no choice, really. but
that wasn't my question. i was just curious as to why it has the side affect
of not restoring the data bank register. i think it should.

albert