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HP-42S / HP-48 infrared connection - Printable Version

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HP-42S / HP-48 infrared connection - Kees Bouw - 07-08-2012

In the articles forum there is an article about creating a ROM dump from the HP-42S into a HP-48.

There are several types of the HP-48: HP-48SX, HP-48S, HP-48G, HP-48G+, HP-48GX, HP-48GII. Will it work with any of these calculators or just a specific model?

Another thing I would like to know is, does a device exist that connects to a Windows computer and that can pick up the infra-red output from a HP-42S and store it in a text file, just like it would print on a HP-82240A printer?


Re: HP-42S / HP-48 infrared connection - Luiz C. Vieira (Brazil) - 07-08-2012

HI.

I remember that the HP42S IR output codding is compatible with the two first HP48 Series: HP48S/SX and HP48G/GX/G+. I cannot tell you if the HP48GII might be used this way, chances are it is IRDA compatible. IIRC, I used an HP48GII to exchange data with an HP50G.

Not too much of a help, sorry.

Cheers.

Luiz (Brazil)


Re: HP-42S / HP-48 infrared connection - Christoph Giesselink - 07-08-2012

Quote:
There are several types of the HP-48: HP-48SX, HP-48S, HP-48G, HP-48G+, HP-48GX, HP-48GII. Will it work with any of these calculators or just a specific model?

AFAIK the program INPRT works only on Saturn based calculators, that means on all with the exception of the HP-48GII which has an ARM CPU inside.

Quote:
Another thing I would like to know is, does a device exist that connects to a Windows computer and that can pick up the infra-red output from a HP-42S and store it in a text file, just like it would print on a HP-82240A printer?

In principle "yes" to the question if such a device exist. But the answer is "no" when you ask where to buy such a hardware interface.

Christoph


Re: HP-42S / HP-48 infrared connection - Matt Swain - 07-08-2012

A device that plugged into a PC parallel printer port existed at one time, I used to use it to make copies of stuff from an HP28. The software may have been DOS based. I may even have it somewhere.

I don't know if this is any help.


Re: HP-42S / HP-48 infrared connection - Christoph Giesselink - 07-08-2012

Quote:
A device that plugged into a PC parallel printer port existed at one time, I used to use it to make copies of stuff from an HP28. The software may have been DOS based. I may even have it somewhere.

Such a product with the name "PrintHP" was sold end of 80'ies in Germany. It had been DOS based and connected to the serial port using the CTS line as input. But the product later got timing problems with 486 and faster CPU's. I personally made a DOS based software for this hardware later. It's still need DOS and I don't know if it still will running on modern hardware. I gave the last try many years ago on a P4/850MHz.

But the question was a module for Windows. IMHO this could only be possible with intelligent hardware using a micro controller decoding the IR redeye format and send it to a PC standard interface (in my case to the legacy RS232C port).

Christoph


Re: HP-42S / HP-48 infrared connection - Harald - 07-09-2012

How about a computer with built in IR transmitter/receiver? My Omnibook XE3 has that. So far all I used it for is communicating with my phone though.


Re: HP-42S / HP-48 infrared connection - Christoph Giesselink - 07-09-2012

IMHO there are some reasons speaking against.

  • most times you don't have direct access to the IR hardware
  • wrong frequency spectrum and timing of the IR diode
  • you don't have an exact time base to measure the timing of the IR signal
  • the used OS has no real time capabilities

The HP48 series which base on the Saturn chip and many MC with special IR receiver fullfill these requirements.

Christoph