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Sinclair ZX Spectrum 48K

The Sinclair ZX Spectrum 48K brought colour graphics, sound and a substantially larger memory to Sinclair's inexpensive computer range. Its small black case, rubber keyboard and rainbow motif became defining images of British home computing.

The 48KB version provided enough memory for sophisticated games, education and creative software, becoming the standard target for a vast commercial library. Attribute-based colour imposed visible limitations, but inventive programmers turned the machine into one of Europe's most influential computers.

Notable Features

• 48KB RAM became the standard configuration for commercial Spectrum software.
• Ferranti ULA combined display generation, memory timing, cassette and keyboard functions.
• Single-key BASIC keywords shared the compact 40-key rubber keyboard.

Historical Significance

• Britain's best-selling microcomputer and the foundation of a major games-software industry.
• Helped establish numerous programmers, publishers and developers whose influence continued into later platforms.

Collector’s Notes

• Early Issue 1 boards and light-grey key mats are especially sought after.
• Original power supplies should be checked before use, and the internal voltage regulator runs hot.

Specifications