Re: TI-H: Internal memory expansion II
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Re: TI-H: Internal memory expansion II
>Thanks for the replies. I will write a doc explaining the procedure so
>everyone who wants to can make such a expansion. About the 86, two
>people asked me if this was possible on a ti86 calc. I don't have one so
>i can not check this, but you can check it for your self. First of all
>how much memory has the 86? If it has 32K it is most likely possible (If
>your calc says that 28K or so mem is available it is most likely 32K,
>but some memory is used for other things like the screen.) Secondly you
>should open your calc and look for a ic with 28 pins divided in two rows
>each on one side of the chip (In the 85 there are two.) You should first
>look for a ic with TI on it. That ic is most likely the ROM of the calc.
>The second ic should have a number, a '-' and then two-digit number
>which identifies the speed of the RAM (like 10 = 10 nanoseconds access.)
Actually 10 would be 100 ns access in this case. You aren't gonna
find high speed SRAM in a ti calc.
>If there are more 28 pins ic's in the 86, write down all information and
>let me know.
It's gonna be a 128k chip. The procedure for upgrading would be the
same as you did for the 85, except there may be two CS lines in which
case things would get more complicated (one would be active high, the
other active low).
-Mel
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