Sinclair ZX Spectrum User Manual

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Chapter 2

be fitted with a ROM containing a modified version of Spectrum BASIC and for devices

that were designed to supplement or interrupt the Spectrum’s BASIC ROM to be

connected behind it and to operate on the modified version instead, e.g. Multiface,

Centronics printer interface. When used in this configuration, the SPECTRA interface

should ideally be connected immediately behind the Spectrum, but this may not

always be possible, e.g. when a ZX Interface 1 is also connected. In such a case, the

ZX Interface 1 would not be able to intercept the ROM fitted on the SPECTRA interface

and so its extended BASIC commands would not be available.

Configuration switches

The SPECTRA interface contains 6 switches that are used to enable / disable the

various facilities it provides. The configuration switches are numbered 1 to 6 and

perform the following functions:

1. Enables sound output through the television’s speaker(s).

2. Enables an onboard ROM to override the Spectrum’s ROM.

3. Enables an onboard ROM or ROM cartridge to extend the Spectrum’s ROM.

4. Enables the RS232 socket.

5. Enables the Kempston joystick socket.

6. Enables the new display modes.

A facility is disabled when its control switch is set to the off position (the slider pushed

to the left), and enabled when set to the on position (the slider pushed to the right).

The use of each switch is described in the chapter that corresponds to the facility it

controls. When operating the switches, avoid placing pressure downwards as this can

damage them and ultimately prevent them from working reliably.

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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)