The Z80/Z80A was a very popular microprocessor, used in a wide range of applications, from gaming consoles like the [[ColecoVision]], the [[Sega Master System]] and [[Sega GameGear]] to personal computers like the [[ZX81]], [[ZX Spectrum]] and [[MSX]].
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It The Z80 was also used in the [[Commodore 64|Commodore C128]] as a secondary processor dual CPU in many computers in order to achieve have [[CP/M]] compatibility. Similarly, :* the [[Commodore 64|Commodore C128]] had one built-in* the Acorn Z80 Second Processor expansion for the [[BBC Micro]] enabled [[CP/M]] compatibility. And * the popular Z-80 SoftCard expansion did the same for the [[Apple II]].* the ATR8000 expansion for the [[Atari 8-bit]]* the Z80 CP/M expansion cartridge for the [[C64]]
The best-selling devices to feature a Zilog Z80 are the [[Sega MegaDrive]] with 40 million units sold [https://segaretro.org/Sega_Mega_Drive#:~:text=The%20Mega%20Drive%20is%20Sega%27s,and%203%20million%20in%20Brazil. Source], and the TI graphing calculators with 90 million units sold [https://drive.google.com/file/d/1PshC6_lvHiBqry2ASsZ5D0AonmW01nxQ/view Source].