Personal Computer Museum, Canada's Videogame Museum

MS-DOS 4.01

MS-DOS 4.01

SystemDOS
Floppy (5.25")6

Microsoft

DOS

Release Date: 11/1/1988
Manufacturer: Microsoft
 
This version was not properly tested and was bug ridden, causing system crashes and loss of data. The original release was IBM's, but Microsoft's version 4.0 (in October) was no better and version 4.01 was released (in November) to correct this, then version 4.01a (in April 1989) as a further improvement. However many people could not trust this and reverted to version 3.3 while they waited for the complete re-write (version 5 - 3 years later). Beta's of Microsoft's version 4.0 were apparently shipped as early as '86 & '87.
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