Path: utzoo!attcan!uunet!cs.utexas.edu!rutgers!sunybcs!bowen
From: bowen@cs.Buffalo.EDU (Devon E Bowen)
Newsgroups: comp.sys.cbm
Subject: Re: Serial Communications faster than 2400 baud on a 128
Message-ID: <19966@eerie.acsu.Buffalo.EDU>
Date: 26 Mar 90 18:08:24 GMT
References: <7113@ucdavis.ucdavis.edu> <3064@uwm.edu> <10201@wpi.wpi.edu>
Sender: nobody@acsu.Buffalo.EDU
Reply-To: bowen@cs.Buffalo.EDU (Devon E Bowen)
Distribution: comp
Organization: State University of New York at Buffalo/Comp Sci
Lines: 16

In article <10201@wpi.wpi.edu>, profesor@wpi.wpi.edu (Matthew E Cross) writes:
> My question is,
> would it be possible to add a UART chip to the 64's bus through the cartridge
> (for lack of a better name) port, and write a driver for it and change the 
> kernal pointer to from the old serial routine to the new serial routine,
> so as to make high-speed communications more reliable (I don't think it would
> require much hardware...)

Yep. I've got a 6551 UART hanging off the expansion bus on my c128. Works
great in c64 mode, too. The circuit isn't quite portable yet, though. For
example, it doesn't work on my friends c64. The bus timing is different on
different makes of the machine. I can (and did at one time) post the
current schematics for it in PostScript form. But there is a large prob-
ability that you will have to debug it for your specific machine.

Devon