Re: TI-H: RAM expansion (sort of)

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: RAM expansion (sort of)
From: Grant Stockly <gussie@alaska.net>
Date: Sun, 16 Aug 1998 20:17:26 -0800 (AKDT)
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <35d368d3.196697@pilot.msu.edu>
References: <19980813145545.15398.qmail@hotmail.com> <19980813145545.15398.qmail@hotmail.com>
Reply-To: ti-hardware@lists.ticalc.org


>>Has anyone seen the RAM/IO expander on Mel's website, the one with the
>>74LSXXX TTL logic IC's??  Well last night I got the parts need to make
>>it(plus some Z80s!!) and am going to breadboard it tonight(with some
>>modifications).  I also have to make the driver software, but that will
>>be easy.  I;m going to use 3 32KBx8 Static RAM chips(That's 96KB of RAM,
>>plus the 28K already on the 85!! Whoohoo!!!).  Next I'm going to make an
>>(E)EPROM program for it so that I can burn them w/o getting an $150
>>programmer.  For those interested, here's the address to the page:
>>http://www.egr.msu.edu/~tsaimelv/download.htm
>>download the zip file exp_old.zip.  It has all the info needed.
>
>
>Heh well I really wouldn't recommend building that thing... Using a
>microcontroller is 100x more efficient and has a lot better chance of
>working.

Expect .5k a sec on a good day...  :)

References:

TI-H: RAM expansion (sort of)

From: "Matt Butch" <mjb25@hotmail.com>

Re: TI-H: RAM expansion (sort of)

From: tsaimelv@pilot.msu.edu (Mel Tsai)