I have the main unit and power adapter.
type computer
country UK
year 1980
os Basic
cpu Z80A
speed ? MHz
ram ?KB
rom ? KB
graphic 24×32
colors mono
sound none
ports UHF tv, Z80 bus, tape
The Sinclair ZX Spectrum Issue One — The Original Rubber Keyboard
The original Sinclair ZX Spectrum, launched on 23 April 1982, is one of the most culturally significant home computers ever produced — the machine that ignited Britain’s software industry, defined a generation’s experience of gaming and programming, and demonstrated that colour home computing could be genuinely affordable. The Issue One was the very first production run of the Spectrum, featuring the distinctive rubber keyboard that gave the original Spectrum its tactile character and its nickname ”the Rubber Keyboard” or ”Speccy.” It sold 200,000 units in its first year and ultimately sold 5 million units across all variants — making it the most popular British computer of all time.
The Colour Revolution at £125
The ZX Spectrum’s achievement was delivering colour computing at a price the ZX81 had established as accessible. At £125 for the 16K model and £175 for the 48K version, the Spectrum offered colour display (15 colours using the unique ”attribute” system), sound through the built-in speaker, 16 or 48 KB of RAM, and a BASIC interpreter that was genuinely comprehensive — Sinclair BASIC included commands for graphics, sound, and the Spectrum’s unique colour attribute system that no other home computer BASIC of the era matched.
The Issue One Significance
The Issue One Spectrum is particularly sought after by collectors as the original production version, before various revisions addressed early manufacturing issues. Issue One boards used slightly different components from later versions and have specific characteristics — including a particular sound character from their ULA variant — that distinguish them from later issues. Finding a working Issue One Spectrum in original condition is increasingly rare, making the Computer Museum Ata’s example a significant collector’s piece.
The Sinclair ZX Spectrum — The Rubber Keyboard Revolution
The Sinclair ZX Spectrum, launched on 23 April 1982 by Sir Clive Sinclair, was one of the most consequential products in British industrial history — the computer that launched a software industry, defined a generation’s relationship with technology, and demonstrated that genuinely capable colour computing could be affordable for ordinary families. At £125 for the 16K version and £175 for the 48K, it delivered colour graphics, sound, and a comprehensive BASIC to a mass audience that the ZX81’s monochrome, soundless environment had only partially prepared.
The Attribute Colour System
The Spectrum’s colour system was its most distinctive technical characteristic. Rather than assigning colours to individual pixels, the display was divided into 8×8 character cells, each assigned one ”ink” colour and one ”paper” colour from 15 available. This approach reduced the display memory needed dramatically — but created ”colour clash,” where sprites moving across differently coloured backgrounds produced jarring colour changes. Expert programmers learned to work creatively within this constraint, and colour clash became as recognisably Spectrum as any other aspect of the machine.
Britain’s Software Industry
The Spectrum’s enormous commercial success — over 5 million units across all variants — generated Britain’s software industry. Bedroom programmers turned professional, small companies grew into major publishers, and a distinctly British game design culture emerged that valued cleverness and originality over technical polish. Elite (1984), Manic Miner (1983), The Hobbit (1982), and hundreds of other titles defined British gaming and established careers that shaped the global games industry for decades.