Re: TI-H: Well, this is rather interesting.


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Re: TI-H: Well, this is rather interesting.



On Sun, 27 Oct 1996 20:26:44 -0600, you wrote:
>>Someone wrote:
>>>         THE QUESTION IS:  Where can I buy a new LCD for it?  I have =
little
>>> time, so if someone knows right off the top of their head, please =
tell me.
>>> Thanx!  BTW: if you're going to tell me, please put the reply line in=
 all
>>> caps.  if you feel like it.  Don't matter TOO much.
>>
>>Have a look through the Digi-Key catalog (www.digikey.com). They have a
>>large variety of LCD panels, modules, etc. If you find one that is
>>compatible with the TI-92, you'll probably also find one just like it,
>>but with a built-in backlight. :) Wouldn't that be cool? You might also
>>search Yahoo, Altavista, etc for LCD panel sources/manufacturers.
>
>Yes, but soldering it in is going to be a bitch.  You'll probably short =
or
>burn something out by trying to de-solder the old one, and solder in the
>new one. Also, you don't knot the protocol for the 92 screen, and I =
don't
>know if there is a standard.  I'm not bashing you idea, more power to =
you,
>but just a few thing to consider before you buy the first LCD with the =
same
>pixel dimensions as the 92.
>




I agree with you.  It's extremely unlikely that you'll find a
compatible LCD screen.  Unless you're willing to pay upwards of $100
for a panel with a built in controller, you're just not going to find
something that will work.  At best you'll find something with similar
specifications, but won't fit in the calc.  Most of the time these
companies use custom built LCD's, and good luck getting the specs from
TI!  It's probably probably uses the standard graphic LCD 4 bit serial
interface, but unless you know everything about the TI-92, it's
impossible to tell which LCd's are compatible.  I think you'll be
surprised at how few places sell LCD screens.


Although a backlit replacement LCD screen would be nice, you also have
to consider the power requirements.  Most backlit LCd's require a
power inverter circuit which steps the voltage up to over 100 volts.
Or, many models require a large negative voltage, like -27 or -35
volts.  Adding DC-DC converter circuitry will be a huge pain.  This
would also cut the battery life by at least %75.


-Mel


<pre>
--
The TI Memory Expansion Homepage
http://pilot.msu.edu/user/tsaimelv/expander.htm
</pre>


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