Acorn Computers Limited PLUS 1, Руководство пользователя

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1 Introduction
The Acorn Electron Plus 1 adds the following capabilities to your Acorn Electron computer
– Four 8-bit analogue to digital input channels, to allow the use of up to two joysticks or four
games paddles, or measurement of up to four analogue voltages.
– A parallel port for connecting a printer with a Centronics
®
compatible interface.
– Two cartridge slots for installing Acorn Electron approved games, utility, application or
language ROMs, or additional expansion devices. The ROMs may either hold files as a
ROM filing system or be paged 'sideways' language ROMs.
All of these facilities are accessed using simple BASIC or machine operating system (MOS)
commands, which are compatible with BBC BASIC.
The different typefaces used
You will notice that some letters, words and phrases in this manual have been printed differently
from the rest of the text. This is to help you tell the difference between explanatory text, words
which appear on the screen and certain keys on the computer keyboard.
– Ordinary text appears like this, or like this for emphasis.
– Text typed in at the computer or displayed on the screen appears
like this
.
– Words like
RETURN
mean that you press the key marked RETURN rather than actually
type the letters RE T U R N.