Re: TI-H: Expanders?

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Expanders?
From: tsaimelv@pilot.msu.edu (Mel Tsai)
Date: Thu, 16 Jul 1998 04:36:04 GMT
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <l0313030fb1d297e0b991@[192.168.1.66]>
References: <Pine.SOL.3.95q.980715201659.15899A-100000@y.glue.umd.edu> <l0313030fb1d297e0b991@[192.168.1.66]>
Reply-To: ti-hardware@lists.ticalc.org


>>I will be building (and selling) Expander IIs in a few weeks.  Bryan
>>Rittmeyer will be selling chips for them if you want o build your own.  They
>>work with the TI-92 right now, and should work with the TI-86 in a few
>>weeks.  For more info, please e-mail me privately.
>
>Just like the EII was supposed to be out in a few weeks in february...  ;)
>
>>And yes, there is an expander (developed by Mel Tsai) that is already out
>>there, but the source of memory chips dried up, so you can't really build
>>one.
>
>You can build it, but both Bryan and Mel don't like the idea.  Its called
>'Grants Not excepted Idea because its dumb and impracticle' expander.
>Thats GNEIBIDAI Expander.  Its an AVR that emulates the ESF chip.

The AVR simply isn't fast enough to do that, grant.  Can the AVR
intelligibly respond to clock transitions every 1 microsecond?  Nope,
not unless it was 50MHz.  The only way would be to slow the driver
down by a LOT.

-Mel

Follow-Ups:

Re: TI-H: Expanders?

From: Christopher Kalos <raptorone@geocities.com>

Re: TI-H: Expanders?

From: Grant Stockly <gussie@alaska.net>

References:

TI-H: Expanders?

From: "Eric M. Fiterman" <ericf@Glue.umd.edu>

RE: TI-H: Expanders?

From: Grant Stockly <gussie@alaska.net>

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