Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!helios.ee.lbl.gov!pasteur!agate!bionet!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: Rs-232 standard?
Keywords: Rs-232 UART
Message-ID: <586@csd4.milw.wisc.edu>
Date: 26 Jan 89 21:22:52 GMT
References: <2471@nunki.usc.edu>
Sender: news@csd4.milw.wisc.edu
Reply-To: jgreco@csd4.milw.wisc.edu (Joe Greco)
Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers
Lines: 28

In comp.sys.cbm article <2471@nunki.usc.edu>, aliu@nunki.usc.edu (Lord Bane) wrote:
>How does the Rs-232 standard is implemented in the Commodore?

RS232 is marginally implemented on the 64/128(/VIC...)  It was an
attempt to cheaply provide a means to connect a 300 baud modem or
maybe a printer, and it succeeded at that.  However, it begins to fail
at higher speeds, and the X-Line handshake isn't all that hot if you
really want to be picky.

>What is the Rs-232 standard?

RS232 and standard in the same sentence.  RS232 is something that
computer hobbyists use in place of the Rubik's Cube (sp?)....  :-)

>Also, I while searching for information about the Commodore
>implementation of the Rs232, I came across a comment saying that
>Commodore wanted to keep the Configuration register compatible with
>the UART chip.  What is this UART?

That would be the 6500 class UART chip, the "6551 ACIA."  It's only
similar....  the general layout of the command and control registers
would remind one of the C64.  However, all the interesting goodies on
the 6551 were not implemented on the 64.
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