Who developed the first operating system?

Answer 1

None, early computers had NO operating system. Jobs were manually loaded and run either by the programmer or a computer operator, one at a time.

By the middle 1950s some companies began to realize the economic inefficiency of this, with computer time costing around $1000 per hour, of having the machine sit idle while the operator slowly set up the next job. This prompted these companies to write the first Batch Monitors. While not yet true operating systems, they allowed a computer operator to prepare a batch of jobs (e.g. dozens to hundreds) and set them all up on the computer once, then the Batch Monitor program would automatically load and run each job one at a time in the sequence they appeared in the batch. Meanwhile the operator could be separating listings from the previous batch, preparing the next batch, etc. This produced much more efficient use of both the computer's and the operator's time. Often these companies donated these Batch Monitors (and other utilities) to the Users Group library supported by the manufacturer of the computer they had. Other companies could get this software and improve on it (early Freeware).

One of the first manufacturer supported Batch Monitors (actually very nearly an operating system but still not quite) evolved this way from a Batch Monitor written by a customer and donated to the Users Group: IBM's IBSYS for the IBM 709, 7090, and 7094. Based on FMS (written by IBM, could only run FORTRAN jobs) and SOS (written by General Motors), IBM released it to customers in 1960 (2 years after the IBM 7090).

What we now call operating systems only began to appear in the middle to late 1960s, on 3rd generation computers being used for dial-up multiuser tymesharing. These systems could simultaneously run both Batch and many Interactive jobs.

Early microcomputers of the 1970s also lacked operating systems. The first microcomputer operating system was Gary Kildall's CP/M (based on a DEC PDP-8 operating system) for the Intel 8080. Originally written to help him develop the PL/M compiler for Intel, when he offered them CP/M too, they turned him down saying "we are a chip maker, not a computer company, we don't need it". Eventually they realized they did need it, so they developed ISIS.

MSDOS was based on a CP/M clone called QDOS: Quick and Dirty Operating System.

Answer 2

The first widely used operating system was CP/M which was created by Gary Kildall in 1974. CP/M was designed to run on PC's based on the Intel 8080/85 CPU.

Answer 3

The first Operating System to run on many computers was CP/M. CP/M was created by Gary Kindall in 1976 and laid the blueprint for popular OS's like DOS and Windows.

Answer 4

it started with the 4004 chip from Intel in 1970.

the first OS was unnamed.

Answer 5

MS-DOS, Sorry that i messed up.