RE: TI-H: SF 92 and Expander SF II with sound

To: "'ti-hardware@lists.ticalc.org'" <ti-hardware@lists.ticalc.org>
Subject: RE: TI-H: SF 92 and Expander SF II with sound
From: Jan Zumwalt <zumwalt@alaska.net>
Date: Sun, 5 Oct 1997 22:45:14 -0800
Reply-To: ti-hardware@lists.ticalc.org
I know "of" it but don't know much "about" it. I'm interested. 
Perhaps a lengthy FAQ could be broadcast on the subject?

On Sunday, October 05, 1997 3:51 PM, Richard Piotter 
[SMTP:richfiles@hotmail.com] wrote:
> >In this message, you mention something about the I2C
> >interface. What
> >exactly is it and where can I get more information on it?
> >
>
> Ask Osma Suominen (?). Osma seems to be the I2C expert on the
> list, I
> know alot about it, but Osma probably can answer more of your
> questions.
>
> Basicly though, it is a simple interface where each device has
> an ID
> code and you can connect multiple devices.
>
> >----------
> >> From: Richard Piotter <richfiles@hotmail.com>
> >> To: jbfpoker@hutchtel.net; ti-hardware@lists.ticalc.org
> >> Subject: TI-H: Re: SF 92 and Expander SF II with sound
> >> Date: Sunday, October 05, 1997 1:46 PM
> >>
> >> >I know I just mailed you but one last question.  Will he
> >> >give the
> >> schematics
> >> >out for the Expander Up.  Also then could I develope
> >> >somthing that
> >> works
> >> >like it.  If I made the assembly software for th 92 would
> >> >the SF
> work?
> >> >
> >> Possibly, you could make a fargo driver for the SF, but i
> >> wish you
> luck.
> >> The TI-92 has a few dificulties with direct link port
> >> opperation. I
> >> think it is possible to do it, but no one has, plus it is
> discontiued,
> >> and with a working prototype out there, it would not be a
> >> very useful
> >> plan. I did however want to see if an Amtel chip could 
work.
> >> And I2C
> >> interface could make it possible and allow multiple chips 
to
> >> run. It
> >> would use a very small interface, and is already developed.
> >> You could
> >> problably even add a 1, 2, possibly even a 4 bit speaker
> >> that would
> work
> >> with it and could run SIMULTANEOUSLY and because the I2C
> >> chip is
> >> bidirectional, it may be possible to record sound using the
> >> speaker
> as a
> >> mic??? I don't know it it would work, but I2C is a powerful
> >>
> interface. I
> >> think someone should consider it. I would even build a
> >> prototype if I
> >> could get the chips and a driver made.
> >>                                       __/|
> >>      _________ _______/\/\___________|  ||
> >> D___|         |_______/\/\___|   ____|  || Speaker
> >> C___| Paralel |_______/\/\___|  /    |__||
> >> G___|   I2C   |_______/\/\___|  -       \|
> >>     |interface|__|<__ _____
> >> +___|  chip   |__>|__|     |
> >> -___|         |______|Amtel| Memory chip
> >>     |_________|______|_____|
> >>                        | |
> >>                        + -
> >>
> >> A buffer may be necesary to run the memory chip and the
> >> speaker, to
> keep
> >> signals flowing directly. The speaker may need a latching
> >> chip to
> keep
> >> it from clicking between reads and writes, but it could be
> >> possible.
> >>
> >>
> >> Richard Piotter
> >>
> >> e-mail: richfiles@hotmail.com
> >>
> >> home page: <A
> >>
> 
>HREF="http://www.geocities.com/SiliconValley/Lakes/5081/Richfi
> >les.html">The
> >
> >> Richfiles</A>
> >>
> >> ______________________________________________________
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> >
>
>
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