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From: pmeyer@ecocd7.intel.com (Paul Meyer)
Newsgroups: comp.sys.mac.hardware,sci.electronics
Subject: TTL I/O from a Mac+
Message-ID: <2628@inews.intel.com>
Date: 30 Jul 90 20:38:47 GMT
Sender: news@inews.intel.com
Followup-To: pmeyer@ecocd7.intel.com
Organization: Intel Corp, Chandler, AZ
Lines: 30


	I am looking at building an IR Remote, the plans for which came
through sci.electronics a couple of months ago.  To make the thing
computer controlled, I need to be able to do some TTL I/O from my Mac.
In the documentation for the remote, all the examples are for PC/AT type
parallel printer ports.  I'm trying to figure out if I can rig something
up to connect it to my mac.

	I have a Vanilla MacPlus.  I need a simple TTL output and input.
I'm willing to jury rig almost anything, although I'd rather not have to
break open the mac to do it.  If I can just get some kind of TTL I/O
from the serial port that would be great.  The other question is what
kind of software interface will I need to sample and to output the
signals?  Ideally I would like to be able to run the thing in Hypercard,
but I also have Lightspeed Pascal if Hypercard can't hack it.  How can I
toggle the serial port pins directly, and how can I poll the pins?

	Any suggestions of solutions or places to look for solutions
will be appreciated.  E-mail all ideas to me, and I'll post a summary to
the net if there is enough interest.  

--

******************************************************************************
** Paul Meyer (602)554-2078 **	                                            **
** Intel Corp. CH3-40       **       But its a DRY heat!!                   **
** 5000 W. Chandler Blvd.   **______________________________________________**
** Chandler, AZ 85210       **  "You killed my true love"                   **
** pmeyer@cmdnfs.intel.com  **  "It's possible.  I kill a lot of people"    **
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