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From: ard@siva.bristol.ac.uk (Tony Duell)
Newsgroups: comp.sys.handhelds
Subject: HP28 and 48 RS232 IR-> RS232 convertors
Keywords: HP28, HP48, RS232, Serial, Communications
Message-ID: <1404@tharr.UUCP>
Date: 8 Nov 90 23:59:27 GMT
Sender: pm111@tharr.UUCP
Reply-To: Tony Duell <ard@siva.bristol.ac.uk>
Organization: Public Access to Usenet in the UK
Lines: 15

I have seen many postings recently about the possibilities of converting 
HP48 and HP28 I/R outputs to RS232. I wonder if this should be added to the 
list of FAQ's? Anyway, It _is_ possible. I have designed decoders for both 
machines, and the designs are public domain. The HP28 one is output-only,
works at 4800 baud, and the circuit is available as a set of 5 HPGL files and
instructions. The HP48 one is bi-directional, works at 2400 baud, and the
circuit is available as a TTYpic. I posted that to the net a few months back, 
If enough people haven't seen it and want it, I can re-post again. It is
reliable, the Boolean Algebra and Digital Simulator programs were both
up-loaded by it, and I have also down-loaded much stuff from here. 


-tony Duell
ARD @ UK.AC.BRIS.SIVA  (JANET)
ARD @ SIVA.BRIS.AC.UK  (Bitnet)