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HP 48 series

Hardware architecture
The HP 48 is a series of graphing calculators designed and produced by Hewlett-Packard from 1990 until 2003. The series includes the HP 48S, HP 48SX, HP 48G, HP 48GX, and HP 48G+, the G models being expanded and improved versions of the S models. Wikipedia
Cost: 350 USD
Dimensions: 17.9×7.9×2.8 cm (7.05×3.11×1.1 inch)
Discontinued: 2003
Display size: 131×64 pixels
Entry mode: RPN
External memory: HP 48SX: Ports 1 and 2 (merged): 256 KB; HP 48GX: Port 1: 128 KB; Port 2: 4,096 KB (4 MB)
Firmware memory: HP 48S series: 256 KB; HP 48G series: 512 KB