Name: Sinclair ZX Spectrum
Brand: Sinclair
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Sinclair ZX Spectrum Service Manual

Spectrum For Everyone https://spectrumforeveryone.com/

5.5 KEYBOARD STRUCTURE

The keyboard is connected horizontally in eight blocks of five keys and vertically in five blocks of eight

keys. The diagram below shows the configuration. It follows that is any block of five keys fail the fault is

with KB2 circuitry or the 8-way membrane, and that if any block of eight keys fail the fault is with KB1

circuitry or the 5-way membrane.

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General

Processor	Zilog Z80A
Clock Speed	3.5 MHz
RAM	16KB or 48KB
ROM	16KB
Graphics	256 x 192 resolution
Sound	1-channel beeper
Storage	Cassette tape
Input	Keyboard
Power	9V DC
Release Year	1982
Display	TV via RF modulator
Ports	Expansion, RF
Colors	15 (8 colours with two levels of brightness each, plus black)