Sinclair ZX Spectrum Service Manual

Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
19
3.2 SYSTEM TEST
The system test for the Spectrum may be undertaken using the ZXTP taped program loaded
conventionally; this requires that the keyboard is connected. The test should be carried out with the
Spectrum connected to its own power supply.
The test program exercises all of the Spectrum circuitry with the exception of the SAVE function. To test
this function a small, possibly one line program should be typed in, SAVED and then VERIFIED as described
in the instruction manual.

Sinclair ZX Spectrum Specifications

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)