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From: greg@walt.cc.utexas.edu (Greg Harp)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Commodore 64 EMulator Cable
Message-ID: <33944@ut-emx.UUCP>
Date: 13 Jul 90 06:03:17 GMT
References: <11254@hydra.gatech.EDU> <13184@cbmvax.commodore.com>
Sender: news@ut-emx.UUCP
Reply-To: greg@walt.cc.utexas.edu (Greg Harp)
Organization: The University of Texas at Austin, Austin, Texas
Lines: 21

The C64 serial port is TTL-level.  Since Centronics parallel is also that
voltage/configuration, the interfacing consists merely of a cable that maps
the 4 or 5 (dont' remember) C64 serial port lines onto the data lines of the
parallel port on the Amy, and a neat little bit o' code to drive it.

The C64 interface isn't as obscure as some people believe -- it's just
non-standard.  At the time it wasn't so important to be compatible, and I
believe CBM chose the serial bus for economic reasons...at least that's
what I remember.  That was a good long time ago...

...greg...

I still have my C64 to Amy cable around, if anyone has any specific
questions about it...

        ___  Disclaimer:  The opinions expressed above are not my own, but
AMIGA! ////  the property of some higher-up power, to which I am only a tool.
      ////     "Welcome, my son.  Welcome to the machine." -- Pink Floyd
___  //// "Reality is only a simulation, and it's still in beta testing." -- Me
\\\\//// 
 \\XX//            Greg Harp                greg@ccwf.cc.utexas.edu