Re: TI-H: Internal memory expansion


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Re: TI-H: Internal memory expansion




Would a similar modification be possiable on the TI-86.  Also does the
calculator drain the batteries power significantly faster with this
modification?

On Wed, 12 Aug 1998 07:20:45 PDT "marcel groenendijk"
<m_groenendijk@hotmail.com> writes:
>
>I have made a simple but effective memory expansion on my ti-85. It's 
>like this: On th main pcb there are three ic's, of which the middle one 
>is a 32Kb SRAM ic. I have bought a second one (cost about 5 guilders, 
>which is about 2.5 US Dollars) and i have placed this above the original

>ic. Furthermore i have disconnected pin 20 (Chip Select) of both ic's 
>and used a switch to connect one of them to the main board (used two 10K

>resistors to pull them up to +5V.) This will enable you to put programs 
>and data in the original mem, then switch to the second mem, put 
>different programs in it, switch back to the first mem and use those 
>programs etc. This has as an advantage that you can store more programs,

>use two different shells and if you remove the batteries (the AAA, not 
>the little battery) and you put them back, that the current mem is 
>reset, but not the second mem (nice to cheat in the classroom even if 
>your teacher is smart enough to take out the battery.
>For more information reply either to ticalc.org or to
m_groenendijk@hotmail.com
>If there's enough demand, i can write a doc explaining in detail how 
>to 
>install this ic.
>
>Neil
>


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