Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!emory!hubcap!jmauric
From: jmauric@hubcap.clemson.edu (Phantom of Adexsi)
Newsgroups: comp.sys.handhelds
Subject: Re: HP48 and IR remote control: request for help
Message-ID: <1991Jun7.022550.20683@hubcap.clemson.edu>
Date: 7 Jun 91 02:25:50 GMT
References: <3632@charon.cwi.nl>
Organization: Clemson University
Lines: 26

From article <3632@charon.cwi.nl>, by jurjen@cwi.nl (Jurjen NE Bos):
> About once a week, we get a request to convert our HP28 remote control program
> to the HP48.  We have not succeeded in doing this yet.
> 
> The main reason that we did not succeed, is that the proper way to control the
> hp48's IR LED has not been found.
> A while ago somebody posted that bit 3 of address #11C controls the LED, but
> this is not useable for a remote control for two reasons:
> - The LED is turned on unmodulated, while a remote control needs a 30kHz
>     modulated signal to work properly.  (Actually, I wrote a remote control
>     program using unmodulated signals, and it works over 6 cm, no more.)

re: 6 cm.
cant you buy an IR booster and have it work for distances more than 6
cm?

can you send me the remote control program via email?

> - The LED is not always turned on if the bit is set, so that the resulting
>     program has unpredictable behaviour.  There is probably a disabling
>     circuit that we do not know of.
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