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Sinclair ZX Spectrum 48k

The ZX Spectrum is remembered for its rubber keyboard, small compact size and distinctive rainbow motif. It was originally released in 1982 with 16 KB of RAM for £125 Sterling or with 48 KB for £175, these prices were later reduced to £99 and £129 respectively.Owners of the 16 KB model could purchase an internal 32 KB RAM upgrade.
 
Later issue machines required the fitting of 8 dynamic RAM chips and a few TTL chips. Users were able mail their 16K Spectrums to Sinclair to be upgraded to 48 KB versions. To reduce the price, the 32 KB extension used eight faulty 64 kilobit chips with only one half of their capacity working and/or available. External 32 KB RAM packs that mounted in the rear expansion slot were also available from third parties. Both machines had 16 KB of onboard ROM.
 
Approximately 60,000 "Issue 1" ZX Spectrums were manufactured; they can be distinguished from later models by the colour of the keys (light grey for Issue 1, blue-grey for later models).

Manufacturer: Sinclair
Date: 1st March 1982

Sinclair ZX Spectrum 48k Manuals :

Item Manufacturer Date
Disk Interface Manual (Technology Research) Technology Research 1984
Sinclair ZX Spectrum +2 Manual Sinclair 1986

Other Systems Related To Sinclair ZX Spectrum 48k:

Item Manufacturer Date
Science of Cambridge MK14 + Original Keyboard Sinclair 1977
Science of Cambridge MK14 Sinclair 1977
Science of Cambridge MK14 - Original Kit Sinclair 1977
Science of Cambridge MK14 + Memory Expansion in wooden case Sinclair 1977
Sinclair ZX80 With ZX81 Keyboard Sinclair 1980
Sinclair ZX80 Sinclair 1st June 1980
Sinclair ZX81 Kit Sinclair 1981
Sinclair ZX81 Issue One Sinclair 5th March 1981
Sinclair ZX Spectrum Console Sinclair 1982
Timex Sinclair 1000 Sinclair 1982
Early Sinclair ZX Spectrum Console Sinclair 1982
Prototype Issue 2 ZX Spectrum Sinclair 1982
Sinclair TS2000 Sinclair 1982
Sinclair ZX Spectrum 16K Sinclair 1st March 1982
Sinclair QL Sinclair 1984
Sinclair QL + SchÖn Keyboard Sinclair 1984
Prototype Sinclair QL Sinclair 1984
Sinclair ZX Spectrum+ Sinclair 1st June 1984
Sinclair ZX Spectrum +2 Sinclair 1986
Sinclair ZX Spectrum 128 Sinclair January 1986
Sinclair ZX Spectrum 128 Sinclair 1st June 1986
Cambridge Z88 Sinclair 1987
Sinclair ZX Spectrum +3 Sinclair 1st June 1987
Sinclair PC200 Sinclair 1988

This exhibit has a reference ID of CH424. Please quote this reference ID in any communication with the Centre for Computing History.

 

Sinclair ZX Spectrum 48k

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