The earliest of computers didn’t have an operating system. By
the early 1960’s, commercial computer vendors were supplying quite
extensive tools for streamlining the development, scheduling and
execution of jobs on batch processing systems.
Through the 1960’s, several concepts were developed which
drove the development of operating systems. The IBM System 360
produced a family of mainframe computer that served consumers with
differing capacities and prices. A single operating system was planned
for these computers rather than developing generic programs for
every individual model.
This concept of a single OS that will fit an entire product line was
crucial for the success of System 360. In fact, IBM’s current
mainframe operating systems are distant relatives of this original
system. The advantage to this is that applications written for the OS
360 can still be run on modern machines.
The OS 360 system also contained another important advance
affecting today’s computers: the development of a hard disk
permanent storage device which IBM called DASD.
A second key development was the concept of time sharing.
Time sharing involves sharing the resources of expensive computers
among multiple computer users interacting in real time with the
system. What that essentially means is that all of the users have the
illusion of exclusive access to the machine. The most famous of time
sharing system was called Multics.
Multics served as an inspiration to a number of operating
systems developed in the 1970’s. Most notably was the Unix system.
Another commercially popular mini-computer operating system was
VMS.
The first microcomputers did not have the capacity or need for
the elaborate operating systems that had originally been developed for
mainframes and minis. Smaller operating systems were developed
and often loaded from ROM and known as Monitors.
One notable early disk-based OS was CP/M which was supported
on many early micro-computers and was largely cloned when MS-DOS
was created. MS-DOS became wildly popular as the operating system
chosen for the IBM PC.
The successive operating systems that came from MS-DOS made
Microsoft one of the most profitable companies in the world with the
development of Windows. The only other alternative throughout the
1980’s was Mac OS which was tied intimately to the Apple McIntosh
computer.
By the 1990s, the microcomputer had evolved to the point
where it became increasingly desirable. Everyone wanted a home
computer. Microsoft had already come out with Windows 95 and 98,
but people longed for more power and more options. Microsoft’s
response to this change was the development of Windows NT which
served as the basis for Microsoft’s desktop operating system line that
launched in 2001.
Apple was also rebuilding their own operating system on top of
Unix core as Mac OS X also released in 2001 developing one of the
business world’s greatest rivalries.
Today, our operating systems usually have a graphical user
interface (GUI) which uses a pointing device such as a mouse of stylus
for input in addition to the keyboard. Older systems – and we mean
REALLY OLD – use a command line interface asking for commands to
be entered via the keyboard.
Both models are centered on a “shell” which accepts and
processes commands from the user. The user may be asked to click
on a button or type in a command upon an on-screen prompt.
By far, the most common operating system in use today is
Windows XP, but Microsoft has just released their newest Windows
project – Windows Vista. Linux is also another popular OS as is Unix.
We’ll explore them later on in the book, but each offers its own
particular advantages and disadvantages.
Considering the boom of the technology market, it’s really a
surprise that there are so few operating systems in existence. There
really isn’t an easy explanation for this, but it is a reality. It would
only seem logical that with all of the different computer manufacturers
out there, there would be more of a choice for an OS than what there
is. It is certainly another anomaly in the world of computer
technology.
So what exactly do operating systems do? Since they really are
the “brain” of the computer, they do quite a bit!
the early 1960’s, commercial computer vendors were supplying quite
extensive tools for streamlining the development, scheduling and
execution of jobs on batch processing systems.
Through the 1960’s, several concepts were developed which
drove the development of operating systems. The IBM System 360
produced a family of mainframe computer that served consumers with
differing capacities and prices. A single operating system was planned
for these computers rather than developing generic programs for
every individual model.
This concept of a single OS that will fit an entire product line was
crucial for the success of System 360. In fact, IBM’s current
mainframe operating systems are distant relatives of this original
system. The advantage to this is that applications written for the OS
360 can still be run on modern machines.
The OS 360 system also contained another important advance
affecting today’s computers: the development of a hard disk
permanent storage device which IBM called DASD.
A second key development was the concept of time sharing.
Time sharing involves sharing the resources of expensive computers
among multiple computer users interacting in real time with the
system. What that essentially means is that all of the users have the
illusion of exclusive access to the machine. The most famous of time
sharing system was called Multics.
Multics served as an inspiration to a number of operating
systems developed in the 1970’s. Most notably was the Unix system.
Another commercially popular mini-computer operating system was
VMS.
The first microcomputers did not have the capacity or need for
the elaborate operating systems that had originally been developed for
mainframes and minis. Smaller operating systems were developed
and often loaded from ROM and known as Monitors.
One notable early disk-based OS was CP/M which was supported
on many early micro-computers and was largely cloned when MS-DOS
was created. MS-DOS became wildly popular as the operating system
chosen for the IBM PC.
The successive operating systems that came from MS-DOS made
Microsoft one of the most profitable companies in the world with the
development of Windows. The only other alternative throughout the
1980’s was Mac OS which was tied intimately to the Apple McIntosh
computer.
By the 1990s, the microcomputer had evolved to the point
where it became increasingly desirable. Everyone wanted a home
computer. Microsoft had already come out with Windows 95 and 98,
but people longed for more power and more options. Microsoft’s
response to this change was the development of Windows NT which
served as the basis for Microsoft’s desktop operating system line that
launched in 2001.
Apple was also rebuilding their own operating system on top of
Unix core as Mac OS X also released in 2001 developing one of the
business world’s greatest rivalries.
Today, our operating systems usually have a graphical user
interface (GUI) which uses a pointing device such as a mouse of stylus
for input in addition to the keyboard. Older systems – and we mean
REALLY OLD – use a command line interface asking for commands to
be entered via the keyboard.
Both models are centered on a “shell” which accepts and
processes commands from the user. The user may be asked to click
on a button or type in a command upon an on-screen prompt.
By far, the most common operating system in use today is
Windows XP, but Microsoft has just released their newest Windows
project – Windows Vista. Linux is also another popular OS as is Unix.
We’ll explore them later on in the book, but each offers its own
particular advantages and disadvantages.
Considering the boom of the technology market, it’s really a
surprise that there are so few operating systems in existence. There
really isn’t an easy explanation for this, but it is a reality. It would
only seem logical that with all of the different computer manufacturers
out there, there would be more of a choice for an OS than what there
is. It is certainly another anomaly in the world of computer
technology.
So what exactly do operating systems do? Since they really are
the “brain” of the computer, they do quite a bit!
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