VTech PreComputer 1000

The VTech PreComputer 1000 is an electronic learning aid for ages 9 and above manufactured by VTech and released in 1988 (USA) and 1989 (Europe). It contains a dot matrix LCD screen, standard size keyboard and a number of activities, including trivia on science, history and general knowledge.
The PreComputer 1000 is VTech's first child learning product to incorporate the BASIC programming language and is the predecessor to the PreComputer 2000.
Specifications.
The VTech PreComputer 1000 relies upon a Z80B clone as its processing core. A 16Kbit (2Kx8bit) 2K Sharp LH5116-10 or Hyundai HY6116ALP-10 SRAM is used for RAM. As of 1992, a CMOS version of the Z80 marketed as the Z84 is used.
A Toshiba TC531000CP 1MBit (128Kx8bit) 128K ROM contains the Operating System and program data. This ROM can be augmented when a cartridge is inserted into the side mounted cartridge slot and selected, thus providing expansion capability.
Text output is supplied by a single row 20 character dot-matrix LCD panel, sound output is via an inbuilt piezo element beeper.
Functions.
The following functions are available on the unit:
BASIC implementation.
PRE-BASIC 1.0 is a simplified unstructured BASIC implementation includes a simple line editor with the ability to change, insert or delete characters on a program line.
Supported features include:
Expansion Cartridges.
The following cartridges were available for the PreComputer 1000 and also supported in the PreComputer 2000. The cartridges could only be inserted with the power off before re-powering and pressing the 'Cartridge' button to activate.
The same Toshiba TC531000CP 128K ROM is used in some cartridges.