Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)

LOOK UP ANOTHER TERM


machine instruction

An instruction in machine language. Its anatomy is an operation code (op code) followed by one or more operand nouns. The op code is the action, while the operands are the data locations in memory to be acted upon or the program location in memory to switch to. There are instructions to INPUT and OUTPUT data, to process data by CALCULATING, COMPARING and COPYING and to go to some other part of the program. There are also instructions that manipulate the CPU's registers, as well as to go to some other part of the program based on the results of the last COMPARE operation (high, low, equal).

The following examples are conceptual and represent what a machine instruction would do. They are not actual instructions. See machine language, hardware platform and computer.


 OP CODE        OPERANDS
 (verb)         (the nouns)

 add            amount to total

 compare        search-key to item-1

 if last compare
  was equal,
  go to         routine-A

 copy           from - to

 go to          routine-X





Personal Use Only

Before/After Your Search Term
BeforeAfter
machinemachine interface
machine addressmachine language
machine codemachine learning
machine cyclemachine readable
machine datamachine safety
machine dependencemachine to machine
machine dependentmachine vision
machine-generated datamacho programmer
machine independenceMacintosh
machine independentMacintosh clone

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
Audio/VideoGraphics
MainframesSecurity
ProgrammingHealthcare IT
System design