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=== {{anchor|3.40|4.00|4.01|4.02|Lifeboat|Captain|Jetski}}PC DOS 4.x === PC DOS 4.0 (internally known as DOS 3.4 originally) shipped July 1988. DOS 4.0 had some compatibility issues with low-level disk utilities due to some internal data structure changes. DOS 4.0 used more memory than DOS 3.30 and it also had a few glitches. Newly added EMS drivers were only compatible with IBM's EMS boards and not the more common{{Citation needed|date=April 2012}} Intel and AST ones. DOS 4.0 is also notable for including the first version of the [[DOS Shell]], a full-screen utility designed to make the command-line OS more user-friendly. Microsoft took back control of development and released a bug-fixed DOS 4.01.<ref name="TackTech"/>
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