Re: TI-H: Port Expander I


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Re: TI-H: Port Expander I




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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