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 and it was possible to install a 32Kb memory expansion card. The PB-1000 was programmable in both a custom version of the BASIC language and an assembly language. A ROM card could be added for CASL assembly for the educational COMET simulator. See also Casio calculator character sets External links Casio PB-1000 J.Roa blog projects Casio PB-1000 Home Page PB-1000 emulator for Windows Pocket Computing: PB-1000 Love-Love PB-1000 homepage Obsolete Computer Museum: Casio PB-1000 Casio PB-1000 page at www.old-computers.com PB-1000 Pocket computers Products introduced in 1987