AMSTRAD cpc 6128 User Instruction page 463

Numeric keypad
The area on the keyboard where number keys are grouped to facilitate entry of
numeric data, and in the case of the 6128, to provide the additional facility of user
definable function keys.
OCR
Optical Character Recognition. A means of reading printed or written characters
with an optical reader and translating them directly into computer readable data.
Octal
A number system to the base of 8, where each digit (0-7) is constructed from three
Bits.
Off line
A computer peripheral - usually a display terminal or a printer - that is not actively
connected to, or accessible by, the main processing unit.
On line
The opposite ofOffline.
Operating system
The attendant in the 'parking lot' referred to under the entry for Memory. Software
that allocates precedence and timing to the operations ofthe computer.
Operator
The part of an arithmetic expression that causes one number to operate on another,
e.g.
+ -
* /
etc.
Output
Anything that comes from a computer as the result of some computational function.
Overwrite
Erase an area of memory by replacing its contents with new data.
Appendix 2 Page 20
Glossary