Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!gatech!emcard!mat
From: mat@emcard.UUCP (Mat Waites)
Newsgroups: comp.sys.cbm
Subject: Re: 1200 baud register settings??
Message-ID: <5929@emcard.UUCP>
Date: 29 Aug 88 12:56:12 GMT
References: <5911@emcard.UUCP> <10390@cs.tcd.ie>
Reply-To: mat@emcard.UUCP (Mat Waites)
Organization: Emory University Cardiac Data Bank
Lines: 38

}In article <5911@emcard.UUCP}, mat@emcard.UUCP (Mat Waites) writes:
}} I'm trying to get 1200 baud working reliably on the 64.
 
In article <10390@cs.tcd.ie} ecarroll@cs.tcd.ie (Eddy Carroll) writes:
}Does Power C install it's own handler into the NMI vector, to handle cases
}where the user does a RUN/STOP-RESTORE? If it does, then this will mess
}up the timing of the NMI RS232 routines. At 1200 baud, the Kernal
}routines are going flat out, and as far as I know, they are VERY dependant
}on getting into the RS232 NMI code as quickly as possibly when an NMI
}timer interrupt occurs.
}
}Presumably you don't have any problems running the same code at 300 baud?

Right, 300 baud works fine. Also right, the RESTORE key is still active
when serial I/O is going on.

I'll have to check the vectors tonight.

}
}If the above does turn out to be the problem, the way around it is
}to replace Power C's code with your own (or just replace the original
}vectors and to hell with RUN/STOP-RESTORE - this might be a good idea
}for testing anyway).
}
}Eddy Carroll                                           |You haven't lived until
}INTER: mcvax!ukc!cs.tcd.ie!csvax1!ecarroll@uunet.uu.net|  you've died in MUD!
} UUCP: {...uunet}!mcvax!ukc!cs.tcd.ie!csvax1!ecarroll  |---* Genuine MUD Wizard

Thanks, Eddy, for some excellent advice.

Mat


-- 
 W Mat Waites            | Emory Cardiac Data Bank | UUCP:  gatech!emcard!mat
                         | Atlanta, GA             | PHONE: (404) 727-7197

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