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Academia - Collins - Pocket Scientific Dictionaries - Computer - English - French - Arabic Letter 1_O

OA
bureautique f

Office automation. Abbreviation for office automation.

object code
code m objet

Object code. A program written in a high-level language is called a source program. A compiler, with or without an assembler, is used to produce a binary version of the original program in the object code. This is actually the machine code that the computer understands and contains data in addition to instructions.

OCR

Abbreviation for optical character recognition
or optical character reader.

octal notation
notation f octale

Octal encoding. In this system, one counts in octals instead of tens, using the numbers from 0 to 7. While the three places in the decimal system represent hundreds, tens and ones, in the octal system they represent multiples of 1, 8 and 64.
For example:
(1×4) + (8×6) + (64×7) = 764 in octal.
448+48+4 =

In decimal notation, each digit is converted in turn. So 7 is 111, 6 is 110, and 4 is 100. Thus: in binary 111110100 = 764 in octal.
(check 256+128+64+32+16+0+4+0+0=500)

OEM
Material constructor

Abbreviation for original equipment manufacturer.

on/off line
connected/autonomous

Connected / disconnected. A term used to describe whether the user of the terminal is connected to the computer or not. Separate terminals are often used to prepare data, although if they had their own processor they could operate as an independent computer.

operand
operand m

A machine code instruction can be divided into two parts: the first is the operator (using the operating code) and determines the operation to be performed (this could be print or format the accumulator). The second is the operator and determines the memory locations to be used, and then - for example - to which port or device the data should be sent.

For example: a machine code instruction using the word 24 bits can be arranged in 8 bits and 16 bits.

16 bit operator, 65536 different addresses
8 bit operator, 255 operations

operating system
system m d'exploitation

Operating system. An integrated set of programs that helps control the entire computer system. This system forms the background between the hardware and the user programs (applications). Operating systems control peripheral devices, storage and formatting programs, and the user, and give messages if something goes wrong, and they also provide security features such as passwords, and generally manage the work of disks. Large computer systems often have specialized operating systems that make the best use of expensive hardware. The job control language consists of commands and instructions that allow the user to communicate with the operating programs.

Common operating systems include: CP/M, MS-DOS, and 12 OS.

operation code
code m d'opération

operation code . A section of a machine code instruction that specifies that what is to be done must be the same, encoded. The code used is called the operation code, and in numeric form it can mean things like "print" or "add" or "subtract". Etc..
For example: the code for the "print" operation could be 13, and so to print the contents of the location 17 the programmer could code:

17 13
or
13 0017

However, this is in binary code: notation

Optical character recognition (OCR) reconnaissance f. optique des caractères (ROC)

Optical character recognition. A device capable of recognizing
normal printed characters, such as A, B, 6, and ?, and providing the corresponding input to the computer. It is currently difficult for this machine to read handwriting, although some types of printing are easy to read. .
The following features are optical recognition features:

OCR7

Examples of applications include the numbers at the end of a gas or electricity bill that specify the amount to be paid, and the automatic sorting of postal codes printed by an optical character recognition machine.