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From: diamant@hpfcbig.SDE.HP.COM (John Diamant)
Newsgroups: comp.sys.handhelds
Subject: Re: Re: IR-remote control for the 28s? How about the 48SX?
Message-ID: <1010014@hpfcbig.SDE.HP.COM>
Date: 19 Apr 91 00:03:16 GMT
References: <1991Apr6.232739.18511@spool.cs.wisc.edu>
Organization: HP SESD, Fort Collins, CO
Lines: 35

James H. Cloos (cloos@acsu.buffalo.edu) writes:

> I've wanted this, too, for a long while.  The assembly src as found in the
> i/r remote article (as archived) should assemble w/o problems in star.  All
> that is needed is the address of the hardware register to write to to
> toggle the i/r led on and off. 

> It would, of course, take a bit more work to combine it with Jan's i/r
> input reader, but at least we could get the ball rolling with that one
> address.....  (hint, hint, hint)

Sorry for the long delay.  I'm only relaying this information from someone
more knowledgeable on 48 internals than I (who just sent me the info), but I
did manage to get what you need:

> You can turn on the LED by writing
> a #8h to the control register at #11Ch.  You turn it off
> by writing #0h. 
> 
> WARNING the LED takes a lot of current.  If you leave it on your
> batteries will be dead in about 5 hours.

I'd love to have a learning remote control for the 48, but I don't have
the internals knowledge to write it myself.  The warning above suggests
that the code manipulating the LED should be wrapped in an IFERR or
equivalent which makes sure the LED is turned off before the program exits.

John Diamant
Software Engineering Systems Division
Hewlett Packard Co.		ARPA Internet: diamant@hpfclp.sde.hp.com
Fort Collins, CO		UUCP:  {hpfcla,hplabs}!hpfclp!diamant

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