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From: Paul.Heller@f421.n109.z1.Fidonet.Org (Paul Heller)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: XMDs for serial I/O?
Message-ID: <668818815.3@blkcat.Fidonet.Org>
Date: 12 Mar 91 16:41:55 GMT
Sender: Usenet@p0.f40.n109.z1.Fidonet.Org
Lines: 16

MC> Does anyone know where I might find XCMDs for writing to and reading f
MC> Mac's serial port?  Any hints or pointers appreciated.
MC> Thanks,
 
Apple sells its "Serial Port Toolkit" of XCMDs thru APDA, and it's
pretty good.  I've used it with great success up to 38.4 kbps, and it
seems solid.  The only serious limitation I've encountered is really a
fundamental HyperCard limit:  you can't deal with ASCII 0s, since
HyperCard doesn't "see" those.  There's an XCMD called "SendSerial"
floating around that will *send* ASCII 0s (and translate from Hex
representations, too) but it doesn't receive.  This shouldn't be a
problem in normal comm work, but if you're talking to an instrument
that uses ASCII 0 for something important, you'll have a problem doing
it with HyperCard.

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