HP Forum Archive 19

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HP20 and USB as showed at HHC Message #1 Posted by cyrille de Brebisson on 9 Oct 2009, 10:34 a.m. Hello, someone at HHC showed me hi modified HP20b with a USB chip mounted in the 20b box... Can you give me the chip reference? thanks, cyrille

Re: HP20 and USB as showed at HHC Message #2 Posted by Pavneet Arora on 9 Oct 2009, 12:20 p.m., in response to message #1 by cyrille de Brebisson I believe Vern Lindsay had one with him. At least it had the USB connector exposed at the bottom. Sorry don't know about the chip(set). Vern made it sound like he lived just across the street from you ;) ;). Edited: 9 Oct 2009, 12:25 p.m.

Re: HP 41CX locked in program mode Message #3 Posted by Raymond Del Tondo on 9 Oct 2009, 4:01 p.m., in response to message #2 by Pavneet Arora Afaik Vern lives in or somewhere near the potato capital, so this should be near to Cyrille's house;-)

Re: HP20 and USB as showed at HHC Message #4 Posted by Paul Dale on 9 Oct 2009, 4:59 p.m., in response to message #1 by cyrille de Brebisson This is interesting. I was recently thinking about how to add some kind of serial connection or IR output to the 20b :-) - Pauli

Re: HP20 and USB as showed at HHC Message #5 Posted by Bill Wiese on 9 Oct 2009, 7:18 p.m., in response to message #4 by Paul Dale I have no direct info, but I'd gues that person just glued in an FTDI USB/serial chip (or maybe one from Silabs/Cygnal)... Bill Wiese San Jose CA

Re: HP20 and USB as showed at HHC Message #6 Posted by Scott Newell on 9 Oct 2009, 7:47 p.m., in response to message #4 by Paul Dale I was surprised to find that the 20B back cover is not transparent to IR.

Re: HP20 and USB as showed at HHC Message #7 Posted by Eric Rechlin on 9 Oct 2009, 7:20 p.m., in response to message #1 by cyrille de Brebisson I think Vern said it was a FT232 variant he bought pre-mounted to a board from SparkFun. The only problem was it was mounted on a 1/16" board instead of a 1/64" board, so it was too thick to close the case properly.

Re: HP20 and USB as showed at HHC Message #8 Posted by Bruce Bergman on 10 Oct 2009, 12:37 a.m., in response to message #1 by cyrille de Brebisson If we track him down, someone please let me know -- I'd really like to add that information to the HP-20b wiki. I think that would be a perfect add-on to the wiki (and the 20b!). thanks, bruce

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