The Commodore 64 (C64) and ZX Spectrum were the primary rivals of the 8-bit home computing era, particularly in the UK, where they defined a decade of “playground wars”. While the ZX Spectrum launched in April 1982 as an affordable entry into computing, the Commodore 64 followed in August 1982 with superior custom hardware for sound and graphics. 

1982: The Birth of the Icons 

• January: Commodore unveils the Commodore 64 at CES in Las Vegas.
• 23 April: Sinclair Research launches the Sinclair ZX Spectrum 16K/48K in the UK. It is marketed for its 15-colour palette and affordable price compared to the BBC Micro.
• August: The Commodore 64 begins volume production and goes on sale in the US for $595.
• Late 1982: Sinclair introduces the Issue 2 motherboard for the Spectrum to fix manufacturing defects. 

1983: Expansion and Price Wars

• January: Commodore introduces the Commodore SX-64, the first commercial full-color portable computer.
• July: The Timex Sinclair 2068, an enhanced US version of the Spectrum, is launched.
• August: Spectrum sales in Britain and Europe exceed 500,000 units.
• December: The millionth ZX Spectrum is manufactured.
• Market Shift: Commodore begins aggressive price-cutting to underbid competitors, leading to the “Home Computer Price War”. 

1984–1985: New Iterations and Corporate Shifts

• January 1984: Sinclair announces the Sinclair QL, intended as a professional successor to the Spectrum.
• October 1984: Sinclair releases the Sinclair ZX Spectrum+, featuring a new QL-style case and a plastic injection-moulded keyboard to replace the original rubber keys.
• January 1985: Commodore releases the Commodore 128, a successor that includes a dedicated “64 mode” for 100% compatibility with C64 software.
• September 1985: The Sinclair ZX Spectrum 128 (codenamed “Derby”) is launched in Spain, featuring 128KB RAM and a three-channel sound chip. 

1986–1987: The Amstrad Era and Redesigns 

• January 1986: The ZX Spectrum 128 is officially released in the UK.
• 7 April 1986: Amstrad acquires the Sinclair brand and computer range for £5 million after Sinclair Research faces financial difficulties.
• Late 1986: Commodore introduces the Commodore 64C, a redesigned model with a sleeker, light-coloured case matching the C128’s aesthetic.
• Late 1986: Amstrad releases the ZX Spectrum +2, featuring a grey case and a built-in cassette recorder.
• 1987: Amstrad launches the ZX Spectrum +3, which includes a built-in 3-inch floppy disk drive. 

1988–1994: The Twilight Years 

• 1988: Amstrad releases the ZX Spectrum +2A, updating the +2 with the internal circuitry of the +3.
• 1990: Commodore attempts to move into the console market with the Commodore 64 Games System (C64GS), a keyboard-less version of the C64 that ultimately fails commercially.
• 1992: Amstrad officially discontinues all ZX Spectrum models after approximately 5 million total units sold.
• April 1994: The Commodore 64 is officially discontinued as Commodore International enters bankruptcy. It remains the best-selling single computer model of all time with 12.5 to 17 million units sold. 

Home Computers, ZX Spectrum versus Commodore 64