Direct mode

Direct mode, also known as immediate mode is a computing term referring to the input of textual commands outside the context of a program. The command would be executed immediately and the results printed on screen, in contrast to programming mode where nothing would be executed until a specific command was given. (BASIC's RUN is an example of a direct mode command.) Some commands could be used in either mode, while others were exclusive to one or the other.

Direct mode was most often used on 8-bit systems such as the Commodore 64 and Atari 800 series, though commands entered at a Unix shell can be thought of as direct mode equivalents to shell scripts, and modern interpreted languages like Python and Perl include REPL shells where commands may be entered for immediate evaluation and execution.

Example

Non-direct mode:

10 PRINT "HELLO WIKIPEDIA"

READY.

RUN

HELLO WIKIPEDIA

READY.

Direct mode:

PRINT "HELLO WIKIPEDIA"

HELLO WIKIPEDIA

READY.

See also

Flight control modes

Aircraft with fly-by-wire flight controls require computer controlled flight control modes that are capable of determining the operational mode (computational law) of the aircraft.

A reduction of electronic flight control can be caused by the failure of a computational device, such as the flight control computer or an information providing device, such as the ADIRU.

Electronic flight control systems (EFCS) also provide augmentation in normal flight, such as increased protection of the aircraft from overstress or providing a more comfortable flight for passengers by recognizing and correcting for turbulence and providing yaw damping.

Two aircraft manufacturers produce commercial passenger aircraft with primary flight computers that can perform under different flight control modes (or laws). The most well-known are the normal, alternate, direct and mechanical laws of the Airbus A320-A380.

Boeing's fly-by-wire system is used in the Boeing 777, Boeing 787 Dreamliner and Boeing 747-8.