Re: TI-H: Port Expander I


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Re: TI-H: Port Expander I




Yeah, probably but I wanted to design something with the AVR MCU's.

>Date: Tue, 14 Jul 1998 07:23:17 -0800 (AKDT)
>To: ti-hardware@lists.ticalc.org
>From: Grant Stockly <gussie@alaska.net>
>Subject: Re: TI-H: Port Expander I
>Reply-To: ti-hardware@lists.ticalc.org
>
>
>Mel would probably say just use a bunch of 8bit I/O expanders and a 
counter
>for $2.  :)
>
>>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
>>
>>______________________________________________________
>>Get Your Private, Free Email at http://www.hotmail.com
>
>
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>
>Thanks.
>
>
>


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