Re: TI-H: Port Expander I


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Re: TI-H: Port Expander I




Well, a $13 chip could do the same thing as 8 $.50 chips and a few other
cheep parts.  :)

>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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>>
>>To talk to me direct, I'm 'weridguy' on AOL IM service.  I don't have
>an
>>AOL account, just the IM thing.
>>
>>Thanks.
>>
>>
>>
>
>
>______________________________________________________
>Get Your Private, Free Email at http://www.hotmail.com


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To talk to me direct, I'm 'weridguy' on AOL IM service.  I don't have an
AOL account, just the IM thing.

Thanks.



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