Re: LF: Upgrading the CPU

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Re: LF: Upgrading the CPU

I'm working on the ram.  Not sure if anyone else is though. See below.




>The 256k ram hole has
>been found before, and a few people are working on exploiting the use of
>this 256k extra, though nobody has attained one of these chips or tried to
>install it to my knowledge, though I could be wrong.


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
>
>
References: