Casio PB-1000

The Casio PB-1000 is a handheld computer released by Casio in 1987 (Released in Japan in 1986). 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.

The PB-1000C, one of the variants released only in Japan, has the CASL assembly language for the educational COMET simulator instead of the HD61700 assembly language. The differences include the implementation of binary and octal calculation instructions in the BASIC language (&B,BIN$,&O,OCT$), the [TAB] key, and the line jumping in the screen editor.