Re: TI-H: Upgrade Ti-92 RAM
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I think you might have to do a ROM Hack For This...
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> From: Bill Stysiack <wjs12@cornell.edu>
> To: ti-hardware@lists.ticalc.org
> Subject: Re: TI-H: Upgrade Ti-92 RAM
> Date: Sunday, November 17, 1996 2:29 PM
>
> I just ordered 2 samples from Marshall, the TC551001BTRI-85L and the
> TC551001BTRL-70L. I hope they send them, they are pickey about those
> things. Does anybody know if the 92's rom supports the extra 128k, or if
> you would only be able to use it with a custom assembly program written
in
> Fargo?
>
> Bill Stysiack
> wjs12@cornell.edu
>
>
> At 02:49 PM 11/16/96 -0500, you wrote:
> > Ram.txt, which comes with Fargo, says,"The TI-92 is capable of
addressing
> >256 kb of interleaved RAM." I then remembered seeing something on the
web
> >about an open memory socket in the TI-92, so I did some investigation.
> > I first found the page with the RAM info,
> >http://www.wam.umd.edu/~ltduck/ti92/ti92.html
> > I then opened my 92 and found the ram module ( labeled U10
> >TC551001BFTL-85L. Went to Toshiba's page and found out the pin
assignments
> >in a PDF file. It is a 32 pin 128kx8 85ns 5V SRAM. Following the paths
on
> >the circuit board, I figured out that the open pads on the 92's board (
> >labeled U10R ) have the pinout of the chips TC551001BTRL-85L or
> >TC551001BTRI-85L. I also found that Marshall electronics sells these
chips
> >for about $24.
> > I'll try to get a free sample of the chip, Marshall gives out samples
I
> >think, and see what I can do. The solder pads are VERRY close together,
and
> >I have a tight budget so I'm a little reluctant about messing around
with my
> >$150 calc. If anyone else has more info I'd like to know.
> >
> >Bill Stysiack
> >wjs12@cornell.edu
> >
> >
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