Feeds

The IBM PC is 30

On 12 August 1981, the world changed

Providing a secure and efficient Helpdesk

OS Stories

The mythology of the IBM PC's operating system has it that the company approached Digital Research (DR), creator of the CP/M OS, but found it lacking in enthusiasm for the project. Microsoft's Bill Gates got wind of this and pitched MS-DOS instead.

MS-DOS Advert

Microsoft advertises DOS in 1983
Source: Fraggle UK at Flickr

In fact, it's likely IBM selected CP/M-86 but was forced to look, at least temporarily, elsewhere as DR's effort to port CP/M to the Intel 8086/8088 CPU was taking longer than planned. Gates may well have pitched an alternative - IBM was already talking to Microsoft about using the latter's implementation of the Basic programming language - and appears to have won the deal in November 1980.

Not long after, Microsoft licensed 86-DOS from Seattle Computer Products (SCP), specifically to sub-license the OS to IBM in turn. 86-DOS had been created by SCP as a stand-in for CP/M-86 and was thus intentionally compatible with the DR OS.

IBM agreed to use 86-DOS, which in July 1981 was acquired in its entirety by Microsoft and renamed MS-DOS. IBM would bundle it as PC-DOS.

IBM PC Ad

Not just for grown-ups

At launch, IBM said it would offer CP/M-86 for the 5150. "IBM has contracted with Digital Research... to make CP/M-86... available for the IBM Personal Computer," the company said on the 5150's day of launch. "We expect [its] availability will provide the opportunity for many current applications to be transferred to the IBM Personal Computer with minimal modifications."

New hybrid storage solutions

Next page: Send in the clones

More from The Register

next story
Apple iPhone 6: Missing sapphire glass screen FAIL explained
They just cannae do it in time, says analyst
Quit drooling, fanbois - haven't you SEEN what the iPhone 6 costs?
How keen will buyers be when exposed to the real price?
Slap my Imp up: Bullfrog's Dungeon Keeper
Monsters need to earn a living too
Amazon axes hated Fire Phone price: 99 pennies but a niche? Ain't none
Forgive the double negative but seriously, no one wants this mobe
Apple's big bang: iPhone 6, ANOTHER iPhone 6 Plus and WATCH OUT
Let's >sigh< see what Cupertino has been up to for the past year
The Apple Watch and CROTCH RUBBING. How are they related?
Plus: 'NostrilTime' wristjob vid action
Oh noes, fanbois! iPhone 6 Plus shipments 'DELAYED' in the UK
Is EMBIGGENED Apple mobile REALLY that popular?
Apple's SNEAKY plan: COPY ANDROID. Hello iPhone 6, Watch
Sizes, prices and all – but not for the wrist-o-puter
Apple Pay is a tidy payday for Apple with 0.15% cut, sources say
Cupertino slurps 15 cents from every $100 purchase
prev story

Whitepapers

Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.