Explain Real Time Operating System With Details And Explanation, Bare Machine Explain In Details
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Real Time Operating System• Real time system is used when there is a rigid time
requirements on the operation of a processor or the flow of
data.
• It is often used to handle dedicated application.
• In this sensor bring the data to the computer, the computer
must analyze the data and possibly adjust the control to
modify the sensors input.
• A real time system has well defined, fixed time constraint.
Processing must be done within the defined constraints, or the
system will fail.
Bare Machine
• Early computers were very large machines run from aconsole (panel for switches, controls etc. ). Firstly the
program would be loaded into memory by plugging in
from the console, take the plug out, load input device,
plug out the input device, load any hardware needed and
so on.
• It was an interactive system but very slow. The
programmer did all the processing as well as loading –
unloading work.
Emergence of new hardware and software
• The programmer made the program and with a set of
description how to run it and gave it to the operator. It
reduce the setup time and programmer could
concentrate on making better programs. The new
software's like assembler, compiler, linker, loader, device
driver etc. were formed.
• Device driver : - Each I/O device has its own
characteristics requiring careful programming. A special
subroutine was written for each I/O device called device
driver. A simple task such as reading a character from a
keyboard might involve complex sequence of device
specific operations. If once written the device driver can
be used again and again.