Operating Systems - How Were They Made?

[JamesU]

I'm kinda curious on how operating systems were originally made. anyone have an answer?

 

[neurocomp2003]

assembly? setting gates and bits to switch flags for specific hardware?

that would be my guess...that is assembly to DOS to graphics.h to
windows/unix.

 

[mattmns]

Maybe read this?

http://en.wikipedia.org/wiki/History_of_operating_systems

 

[JamesU]

what I meant was: what languages were used in the computer? I was too vague, sorry

 

[moose]

what I meant was: what languages were used in the computer? I was too vague, sorry

By 1973, the C language had become powerful enough that most of the UNIX kernel, originally written in PDP-11/20 assembly language, was rewritten in C.

That tells you what Unix was originally programmed with, and reprogrammed with.

 

[dduardo]

A little assembly, but mostly C.

 

[ComputerGeek]

assembly? setting gates and bits to switch flags for specific hardware?

that would be my guess...that is assembly to DOS to graphics.h to
windows/unix.

err.. no.

it was Human based manipulation of registers

to

assembly

to

UNIX

to

a billion other little OSs in the late 70's and 80's (yes, that includes Windows, DOS Mac OS, linux, freebsd, etc)

 

[EnumaElish]

Was Mac the first OS with a desktop and a mouse, instead of a command line and a keyboard?

 

[dduardo]

The first personal computer was the Xerox Alto:

http://en.wikipedia.org/wiki/Xerox_Alto

The Mac was based on this computer.

 

[neurocomp2003]

really unix came before dos?

 

[ComputerGeek]

really unix came before dos?

Oh my gosh... are you serious?

yes, Unix came out years and years before DOS. DOS was a POS OS that did not even support networking or protected memory. Unix had both of those in the 70's.

 

[Grotesque Puppet]

Before C, all operating system were programming in assembly