TI-H: Port Expander I

To: ti-hardware@lists.ticalc.org
Subject: TI-H: Port Expander I
From: "Matt Butch" <mjb25@hotmail.com>
Date: Mon, 13 Jul 1998 16:42:48 PDT
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org


I have designed a port expander(PEI) for the TI link port.  Features 
include:

-Atmel AT90S1200 MCU
-8 data lines. plus a another for misc use
-3 address line, for connection of up to 8 modules
-seperate power supply

there will be 2 kinds of modules.  The first will have it's own address 
decoder for plugging directly connecting into the Expansion Module 
Port(EMP), and the other will plug into a board that already has the 
address decoders onboard.

If anyone is interested in the schematics drop me a line.  It's a zipped 
file, and the pics are jpg.  It might be hard to read since I drew them 
out on paper and then scanned them in.

Port Expander II
thes will have a 4414 or 8515 as it's controller.  It will have 4-6 
address lines for 16, 32, or 64(might be overkill and one hell of a 
power user but what the hell), and 26-28 data lines.


Matt Butch

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