Re: TI-H: Internal memory expansion

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Internal memory expansion
From: Bryan Wyatt <bryan_wyatt@rocketmail.com>
Date: Wed, 12 Aug 1998 15:28:49 -0700 (PDT)
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org



I'm interested, if it works on the 83.

Wyatt



---MaxxKills@aol.com wrote:
>
> 
> 
> Im interested!
> 
> 
> In a message dated 98-08-12 11:43:28 EDT, you write:
> 
> << >
>  >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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