Re: TI-H: Port Expander I
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Re: TI-H: Port Expander I
$13??? a 1200 is about 3 bucks
>Date: Tue, 14 Jul 1998 08:54:32 -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
>
>
>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.
>>>
>>>
>>>
>>
>>
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>
>
>---
>
>To Subscribe to the ACplay mailing list, please send a message to
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>
>To get an e-mail every time http://gussie.alaska.net is updated, please
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ACNOTIFY".
>
>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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