Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!ames!dftsrv!mimsy!mojo!russotto
From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.comm
Subject: Re: Need hardware flow control cable for 512E and V.32/V.42bis modem
Message-ID: <1990Dec2.074323.24018@eng.umd.edu>
Date: 2 Dec 90 07:43:23 GMT
References: <1990Dec1.033152.7268@cs.umn.edu>
Sender: news@eng.umd.edu (C-News)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 37

In article <1990Dec1.033152.7268@cs.umn.edu> kanefsky@cs.umn.edu (Steve Kanefsky) writes:
>I just acquired a 9600 baud, V.32 V.42bis modem, and for the time being
>I'm stuck with only a Mac 512E to use it on (i.e. a 9-pin D connector
>for the serial port instead of the 8-pin DIN connector).
>
>The modem came with a cable which supports hardware flow control, but
>it terminates with the 8-pin DIN connector used on every Mac *except*
>the 128, 512, and 512E.
>
>I need one of the following:  
>
>(1) An adaptor which converts the 8-pin DIN connector to the 9-pin D connector
>    (i.e. *female* 8-pin DIN to *male* 9-pin D) which preserves the hardware
>    flow control.
>
>(2) A cable which goes directly from the modem to the 9-pin D connector on
>    the Mac, and WHICH SUPPORTS HARDWARE FLOW CONTROL (I already have one
>    which doesn't support hardware flow control).
>
>(3) Directions for how I can convert my non-hardware-flow-control cable to
>    a hardware flow control cable.
>
>Can anyone point me to a source for (1) or (2) or supply (3)?  I have my
>doubts that (1) or (2) even exist, but who knows?  I'm sure someone can
>help with (3).  I've seen pin assignments posted for the 25-pin to 8-pin
>cable, but not 25-pin to 9-pin, and even when I ignored the 8-pin side,
>it didn't seem that the pins on the 25-pin side matched up at all with
>the pin assignments that were posted (either the hardware flow control
>pin assignments or the XON/XOFF pin assignments).  Either my cable is
>screwed up or I'm not understanding the pin assignments or something.

You aren't going to like this, but it just isn't possible.  The Mac 512 does
not support output handshake.  See Tech Note 65 for an adaptor that
will preserve input handshake.
--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
     .sig under construction, like the rest of this campus.