Xref: utzoo comp.sys.handhelds:6102 sci.electronics:18440
Path: utzoo!news-server.csri.toronto.edu!rutgers!usenet!ogicse!mintaka!think.com!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!stda.jhuapl.edu!mjj
From: mjj@stda.jhuapl.edu (Marshall Jose)
Newsgroups: comp.sys.handhelds,sci.electronics
Subject: HP printer data format/protocol?
Keywords: printer HP-42 IR data transfer
Message-ID: <1991Mar13.230901.4031@aplcen.apl.jhu.edu>
Date: 13 Mar 91 23:09:01 GMT
Sender: news@aplcen.apl.jhu.edu (USENET News System)
Reply-To: @aplvax.jhuapl.edu:mjj@stda.jhuapl.edu (Marshall Jose)
Distribution: usa
Organization: The Johns Hopkins University Applied Physics Laboratory
Lines: 16

I've wanted for some time to be able to post some HP-42 programs while
introducing as few errors as possible in the transcribing process.  I've
been thinking about capturing the IR data which is normally intended
for the printer.

On a hunch, I took one of those Radio Shack IR receivers typically used in
home-entertainment stuff, and which assumes the data is PCM'd on a
40 kHz carrier.  My hunch was right: I saw nicely-formed 2400 baud
serial data on its output pin when I pointed the calculator at it.

Does anybody know what the protocol is for this data?  If it's not
too bizarre, I think it'd be the bee's knees for what I have in mind.

Later,
Marshall Jose  WA3VPZ
mjj%stda@aplcen.apl.jhu.edu  ||  ...mimsy!aplcen!aplvax!mjj