Path: utzoo!attcan!uunet!cs.utexas.edu!rutgers!uwvax!dogie.macc.wisc.edu!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: rs-232 interface for c64 (AN UPDATE !!)
Keywords: RS-232,C64,Hayes comp. modem
Message-ID: <2502@csd4.milw.wisc.edu>
Date: 12 May 89 18:41:50 GMT
References: <7932@batcomputer.tn.cornell.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Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers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: 19

In comp.sys.cbm article <7932@batcomputer.tn.cornell.edu>, pwong@batcomputer.tn.cornell.edu (Patrick Wong) wrote:
]the circuitry of this gadget) and the label on the chip has been masked
]by a black marker pen.  If I find a safe way to remove the marker ink
]in the future, I would gladly tell anyone who wants to know.  For the
]coating , that's another story though.....

Anybody wanting to design a *cheap* RS232 interface should be using
the MAX232 chip, which is no big secret.  I believe Steve Ciarcia
outlined it's use a few years ago.  It generates the needed voltages
from a single +5v supply, and should be a snap to use.

I haven't actually tried one, since they must be ordered mail order,
but I would expect the price to be a fair amount less than a 1488/1489
and support circuitry.
--
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