Casio PB-1000
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The Casio PB-1000 is a handheld computer released by Casio in 1987. It featured a touchscreen display which consisted of 16 keys built into the screen, arranged in fixed positions on a four by four matrix.
The computer itself included 8Kb of RAM... Wikipedia
CPU: Hitachi HD61700 (CMOS)
Display: LCD, 192*32 pixels, 32x4 chars (32x8 chars virtual), 4x4 touch screen
Release date: 1987