HP Forum Archive 14

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HP 71 - serial interface Message #1 Posted by Karel Kupka on 6 Jan 2005, 7:39 a.m. Hello. Does there exist any interface or cable for HP 71 or HP 41 to send and receive data via RS232 serial link (with 9-pin Canon connector on the other end)? And of course any program or system command support like OUT and IN on the respective device?

Re: HP 71 - serial interface Message #2 Posted by Emmanuel, France on 6 Jan 2005, 12:57 p.m., in response to message #1 by Karel Kupka [pre]Dear Karel, I only know two interfaces: HP82164A made by HP, and one made by Hand Held Products (32k buffer & autopowered). ;o) Emmanuel [pre]

Re: HP 71 - serial interface Message #3 Posted by Garth Wilson on 6 Jan 2005, 2:21 p.m., in response to message #2 by Emmanuel, France Add to that the FSI164A from Firmware Specialists, Inc., which is virtually 100% compatible with the HP unit but came with two RS-232 channels and optionally up to 8, and also offered the option to go battery-powered. Mine is only two channels and not battery-powered. I've used it a lot with both the 41cx and the 71B. A scan of the manual (actually mine) is available on the HP-41 website. There was a way to make a serial port on the 71 by soldering a couple of wires onto uncommitted I/O pins on the processor IC. (There would not be any line drivers or receivers though.) It doesn't seem to be in the book "Control the World With HP-IL", so maybe it was in one of the CHHU Chronicles. It would take me some digging to find it. I definitely would not risk damaging either of my 71's though when they both work 100% like new and there's no support for them anymore if I damage anything.

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