Re: TI-H: Upgrade Ti-92 RAM


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Re: TI-H: Upgrade Ti-92 RAM



I think you might have to do a ROM Hack For This... 


----------
> 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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