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Full Version: HP-28 RS232 interface (wasn't someone after this?)
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I just came across this (hidden in plain sight I guess)

On this page: http://www.hpcalc.org/docs/misc/

You'll find a link to an article about adding an RS232 port to the HP28: http://www.hpcalc.org/docs/misc/hp28io.txt

It's not complete, but it does show you what you can do if you're prepared to take to your HP28 with a saw! (gasp)