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from Wikipedia:

The Sharp MZ is a series of personal computers sold in Japan and Europe (particularly Germany and Great Britain) by Sharp beginning in 1978.

Although commonly believed to stand for “Microcomputer Z80″, the term MZ actually has its roots in the MZ-40K, a home computer kit produced by Sharp in 1978 which was based on Fujitsu’s 4-bit MB8843 processor and provided a simple hexadecimal keypad for input. This was soon followed by the MZ-80K, K2, C, and K2E, all of which were based on 8-bit LH0080A Sharp CPU (compatible to Zilog Z80A) with an alphanumeric keyboard.

The Sharp MZ80K was one of the popular early consumer-level microcomputers, with an architecture based on the Zilog Z80 8-bit microprocessor. It was introduced into Europe in 1979. The machine had 48KB of RAM, 32KB of which was available for user programs (the actual figure was dependent on the memory configuration and the system languages being used).

It could run a variety of high-level languages including BASIC, Pascal and FORTRAN, which had to be loaded into RAM before any programming could be undertaken. It could also be programmed directly in assembly code or machine code. The machine had an inbuilt monochrome display and a cassette tape drive. The display, keyboard and cassette drive lifted on hinges to expose the motherboard and circuitry underneath. Graphics capability was primitive, with only preset shapes and icons being available and no native hi-res capability.

This was not unusual for a late-1970s vintage microcomputer. The main drawback, however, of the MZ-80K was the non-standard keyboard, which was difficult to use.

The MZ-80K sold well in Europe despite its high price (it retailed at over £500 in 1980), and a large range of software was available, including some Japanese arcade games. It was superseded in 1982 by the MZ-80A machine.

source: wikipedia