Commodore 64 was the most successful 8-bit micro ever according to The Commodore 64 is 30 article. Commodore 64 made its public debut at the 1982 Consumer Electronics Show (CES), though it wouldn’t go into production until later in the year before going on sale in the US market in August and few months later in Europe.
Inside, Commodore had packed a 6510 processor, an updated version of MOS Technology’s popular 6502, the chip used in the Vic-20, the BBC Micro and many others. In the UK, the 6510 was clocked at 985KHz, though the US version apparently ran at slightly over 1MHz. As the computer’s name suggested, it had 64KB of memory (though only 38KB of that was available to Basic). Basic was stored on a 20KB Rom chip and copied into the main memory when the 64 was booted.