Re: TI-H: Modems, Chips, and TIs...OH MY!!!

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Modems, Chips, and TIs...OH MY!!!
From: Osma Suominen <ozone@clinet.fi>
Date: Wed, 28 May 1997 00:17:24 +0000
References: <01BC649B.CD49B700@pm2-4-170.apci.net> <33870e02.3937764@pilot.msu.edu> <33820C5A.EAA@netrus.net> <33832915.253615@pilot.msu.edu> <338317AE.69341B3D@clinet.fi> <338669c7.951178@pilot.msu.edu> <3384ADB4.1E12079F@clinet.fi> <339ced58.2600924@pilot.msu.edu>
Reply-To: ti-hardware@lists.ticalc.org

Mel Tsai wrote:

> Okay, I understand what you mean.  But how do you get a schmitt
> trigger to reference to these voltage levels?  The problem is that
> you'll have to create a precise reference so that it will trigger at
> (for example) 1V and 3V.
> 
> Another (huge) problem is that there's absolutely no way to guarantee
> that the link will go above and below those levels within a single IN
> 7,A and OUT 7, A instruction cycle, and the timing on this will be
> very difficult, probably impossible.  There's no easy way to cheat
> capacitances!  But if you can figure out exactly how to organize this
> then it may speed transfers up dramatically (but it will complicate
> the expander design due to the extra schmitt trigger chip).

Well, I'm not going to do it, that's quite certain. I just posted my
idea when I had one. I don't think I could get it to work, my experience
is not that good.

-Ozone

-- 
*** Osma Suominen *** ozone@clinet.fi *** http://www.clinet.fi/~ozone
***

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Re: TI-H: Modems, Chips, and TIs...OH MY!!!

From: tsaimelv@pilot.msu.edu (Mel Tsai)

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