Re: 12c+ Firmware Message #2 Posted by Katie Wasserman on 14 Sept 2010, 1:06 a.m., in response to message #1 by Michael Bromm
You need a special serial cable that plugs into the 6-pin connector inside the battery compartment. The HP guys here (Tim and Cyrille) can comment on the available of these and the availability of updated firmware.
As far as I know you can't buy this cable anywhere, however it would be possible to make one yourself and the circuit has been described in detail here. Then you'd need to find the latest firmware somewhere, but I don't think that HP has that freely available for download.
This issue has come up with the 12C+ before and potentially with the 20b and 30b too since they all share the same ARM processor, programming connection and firmware update method. It would be great if HP (T & C) could contract with a place that can sell the cable and host the firmware for download. Eric Rechlin already sells a HP-20b "hackers kit" and similar things on his commerce site, perhaps he'd want to carry these cables and firmware.
-Katie
Edited: 14 Sept 2010, 1:07 a.m.
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