Re: TI-H: Internal memory expansion

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Internal memory expansion
From: Grant Stockly <gussie@alaska.net>
Date: Sun, 16 Aug 1998 20:17:16 -0800 (AKDT)
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <19980812142046.17083.qmail@hotmail.com>
Reply-To: ti-hardware@lists.ticalc.org


So does it connect to the calcs bus?  (sorry, I just got out of 8 hours in
the car and am very tired...)

>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
>
>
>______________________________________________________
>Get Your Private, Free Email at http://www.hotmail.com

References:

TI-H: Internal memory expansion

From: "marcel groenendijk" <m_groenendijk@hotmail.com>

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