Linked by snydeq on Mon 14th Jan 2013 18:46 UTC
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DOS 4.0 was going to have some kind of multi-tasking, but with all the project delays it turned out to be a Vista kind of thing.
Microsoft ended up releasing DOS 4.0 with lots of the refactored code still in place, the end result being a buggy OS with not enough memory space for user applications (these were the 640KB days).
Microsoft ended up releasing DOS 4.0 with lots of the refactored code still in place, the end result being a buggy OS with not enough memory space for user applications (these were the 640KB days).
This is a point of massive confusion. There were actually two independent DOS 4 projects -- one at Microsoft, and one at IBM.
MS-DOS 4.0 was supposed to be the oft-awaited Multitasking DOS. It never got widely released. Larry Osterman's blog gives the details: http://blogs.msdn.com/b/larryosterman/archive/2004/03/22/94209.aspx
PC-DOS 4.0 was written mostly by IBM to support the larger hard drives of the PS/2. It was developed from the DOS 3.3 codebase -- not Multitasking DOS. Some Microsoft developers were shipped out to IBM to help them work on it, but they formed a minority of the development team.
DOS 4.01 was the bugfix release for PC-DOS 4.0. It is unclear whether IBM or Microsoft was responsible -- I've read conflicting reports. Either way, Microsoft was in the unusual position of releasing a version of MS-DOS that was based on PC-DOS -- the opposite of the usual situation.
MS-DOS 5.0 was once again developed at Microsoft. And then Microsoft and IBM parted ways on DOS 6.
I just stated my memories of the time.
Eventually I moved into DR-DOS 5.0 when it got available.
Then back to MS-DOS (5.0) for whatever reason I cannot remember anylonger.
Finally when I got my hands on Windows 3.1, DOS became nothing more than a bootloader + gaming environment. Although by those days I was already using Stacker on my hard disk.





Member since:
2005-07-08
DOS 4.0 was going to have some kind of multi-tasking, but with all the project delays it turned out to be a Vista kind of thing.
Microsoft ended up releasing DOS 4.0 with lots of the refactored code still in place, the end result being a buggy OS with not enough memory space for user applications (these were the 640KB days).
This left most of the people using the 3.3 version while waiting for whatever would come next.
I also only had it for a little while, before going back to 3.3.