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HP Xpander
The HP Xpander was to be Hewlett-Packard's newest graphing calculator in 2001, but the project was cancelled months before it was scheduled to go into production. It had both a keyboard and a pen-based interface, measured 162.6 mm by 88.9 mm by 22.9 mm, with a large grayscale screen, and ran on two rechargeable AA batteries. It had a semi-translucent green cover on a gray case and an expansion slot.
The underlying operating system was Windows CE 3.0. It had 8 MB RAM, 16 MB ROM, a geometry application, a 240×320 display, a Hitachi SH3 processor, and e-lessons. One of the obvious omissions in the Xpander was the lack of a computer algebra system (CAS).
==Math Xpander==
After discontinuing the Xpander, HP decided to release the Xpander software, named the ''Math Xpander'', as a free-of-charge application that ran on Windows CE-based Pocket PC devices. It was hosted by Saltire Software, who had been involved in its design.〔(【引用サイトリンク】 title=Consulting )〕〔(【引用サイトリンク】 title=Hewlett-Packard HP Xpander )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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