The HP-49G series are Hewlett-Packard (HP)-manufactured graphing calculators. They are the successors of the HP-48 series, one of the best-selling calculator ranges among engineers, scientists, and students.

Specifications

HP-49G

The 49G has algebraic (default) and RPN entry modes, and is based on a 4MHz HP Saturn processor.

The calculator is often compared to the Texas Instruments TI-89, which is targeted more towards classroom use and employs a drastically faster CPU. Speed of calculation varies between the two calculators for each particular problem, but generally the TI-89 CAS (based on Texas Instruments' Derive engine) outperforms that of the 49G (in areas such as simultaneous equation solving, integration, and matrix manipulation), though the 49G is faster in other areas – notably 3D plot generation and series expansion.

Basic characteristics

• Screen resolution: 131×64 pixels
• CPU: 4MHz Saturn
• Memory: 2 MB flash memory and 512 KB RAM
• Computer algebra system: improved ALG48+Erable combination from the HP-48
• Communication: Serial port

HP-49G Plus

The HP-49G Plus (sometimes written HP-49G+) 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 models.

Programming

The HP-49 series of calculators support a stack-based programming language named Reverse Polish Lisp (RPL), a combination of Reverse Polish Notation (RPN) and Lisp. RPL adds the concepts of lists and functions to stack-based programming, allowing the programmer to pass unevaluated code as arguments to functions, or return unevaluated code from a function by leaving it on the stack.

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 confirmed 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

• HP calculator wiki
• HP's official HP-49G Plus homepage
• HP-49G Plus section at www.hpcalc.org
• http://www.live-id.org/hp49gplus/
• HP-GCC C compiler at Sourceforge