TI-H: Internal memory expansion
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TI-H: Internal memory expansion
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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