HP Graphing Calculator Product Features
	HP 9g graphing calculator	HP 39gs graphing calculator	HP 48gII graphing calculator	HP 50g graphing calculator
Applications	General Math, Pre-Algebra, Algebra, Trigonometry, Statistics, Geometry, Biology, Chemistry, Physics, Earth Sciences and more.	General Math, Pre-Algebra, Algebra, Trigonometry, Calculus, Statistics, Geometry, Biology, Chemistry, Physics, Earth Sciences and more.	Engineering, Computer Science, Surveying, Trigonometry, Calculus, Statistics, Geometry, Biology, Chemistry, Physics, and more.	Engineering, Surveying, Math,Statistics, Computer Science, Trigonometry, Physics, Calculus, Geometry, Biology,Chemistry
Display	32 x 36 pixels 2 lines + indicators	131 x 64 pixels 7 lines x 33 characters + 2 lines header + 1 line of menu + 6 dynamic menus 2D	131 x 64 pixels 7 lines x 33 characters + 2 lines header + 1 line of menu + 6 dynamic menus 2D and 3D	131 x 80 pixels 9 lines x 33 characters + 2 lines header + 1 line of menu + 6 dynamic menus 2D and 3D
Entry-System Logic	Algebraic	Algebraic	RPN, Algebraic, Textbook	RPN, Algebraic, Textbook
Built-In Functions	600+	600+	2,300+	2,300+
Time Saving Technology	Has memory functions for storing and retrieving data and 2 clear memory options	HP Solve	RPN HP Solve HP Equation Writer HP MatrixWriter	RPN HP Solve HP Equation Writer HP MatrixWriter
Additional Value Added	20 physics constants   Scientific, Engineering notation   Converts data to and from degrees, minutes, and seconds   Metric conversion   "pi" key	Built-in electronic lessons (aplets) promote self learning and downloads of additional aplets are FREE Dynamic split screen making side-by-side comparisons easy. Easy to use symbolic (equation entry), table, graph views at a touch of a button	Onboard library with 180+ scientific and engineering constants and units. Computer Algebra System (CAS) delivers dynamic symbolic manipulation and numeric solving so you can easily perform complex arithmetic or calculus functions HP Step-by-Step problem-solving displays show you how the problem is solved in addition to providing the answer.	Computer Algebra System (CAS) delivers dynamic symbolic manipulation and numeric solving so you can easily perform complex arithmetic or calculus functions HP Step-by-Step problem-solving displays show you how the problem is solved in addition to providing the answer. Onboard library with 180+ scientific and engineering constants and units. SD card expansion port for storing, loading programs RPL, System RPL, Assembly and ARM programming
Connectivity	-	Serial/USB cable and software is included to connect to PC.     Infrared port allows communication with another HP 39Gs	Serial cable is included to interface with a PC, and any data you collect can be analyzed on your calculator. Infrared port allows communication with another HP 48gII at high speed.	Serial/USB cable and software is included to connect to PC. Infrared port allows communication with another HP 50g at high speed.
Memory Registers	26 registers	200KB user 256KB total	80.7KB user 128KB total	1.13MB user 2.5MB total Up to 1Gb additional memory through an SD card (SD card not included)
Menus, Prompts, etc.	Yes	Yes	Yes	Yes
Keyboard	Numbers, Letters	Numbers, Letters	Numbers, Letters	Numbers, Letters