Screen Editor; Serial Interface - AMSTRAD CPC464 User Manual

Resolution
The ability to determine where one element of the display ends, and the next one begins. Also
loosely applied to the ability of a computer to perform arithmetical manipulations on large
numbers.
Reverse Polish notation
(RPN) A method of describing arithmetical operations favoured by some calculator
manufacturers, where the operators /) are placed behind the values to which they apply.
X,
RF Modulator
The means by which the video signals from the computer are encoded and 'transmitted'to the
aeriel input of a standard TV set.
ROM
Read Only Memory. Generally with reference to semiconductor memory systems: once
written, neither erasable, nor re-writable.
Routine
A part of the program that performs a 'routine' task. A 'sub' program that resides either
within a main program, or may exist as a separate module for incorporation into a variety of
applications programs. eg A program to derive a 12 hour display from the system's clock may
be considered as a routine.
RS232C
A specific standard for serial data communications interfaces. Devices at both ends of the
data link using an RS232 interface require to be 'configured' to the particular conditions of
the RS232 data standard used. Compare this with the Centronix parallel interface where the
interconnection is a rigid standard.

Screen Editor

A text or program editor where the cursor may be taken to any part of the screen display in
order to alter the, characters appearing there.
Scrolling
The term describing the way in which the screen display 'rolls up'when the display fills up to
the bottom, and needs to make space for the next line of entry or output to appear.
Separator
A separator performs the same function as a delimiter: ie. marking the boundary between
reserved words and other elements of the program or data..

Serial interface

Although this term nearly always refers to an RS232 interface, other serial standards exist
for the sequential transmission of computer data.