The HP-49G Plus reference article from the English Wikipedia on 24-Jul-2004
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HP-49G Plus

Helping orphans the way you would do it
The HP-49G Plus (sometimes written HP-49G+) is a graphing calculator manufactured by Hewlett-Packard. This calculator features an ARM 75Mhz CPU and chipset, an SD memory card port, and a USB communications interface, amongst other improvements over previous HP-48/49 versions.

Issues and bugs

There have been some issues regarding the 49G+. Initially there was a problem with battery life, but an upgrade of the system ROM has apparently fixed that. Also, some people have reported that the keyboard has not been registering keypresses. The keypress issue has not been confimed and it is not publicly known if this is a major problem with the model.

The current ROM version can be determined by the command VERSION. The most recent version at the time this was written was 1.23, which should report as: 

"Version HP49-C

 Revision #1.23"

"Copyright HP 2003"
If the version reported is less than 1.23, the ROM should be updated. A current ROM, and installation instructions, can be found at HP's 49G+ homepage (see external links, below).

External links