These are .tap tape images, generated by running the cassettes on a normal audioplayer, then using Jim Battle's dpwav2tap program ( adapted for 64 bits systems) 
 
From the fileheader :
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DOS.D is the Datapoint Corporation Disk Operating System for the
 1800, 5500, 6600 processors, and the 932X/937X disk drives or the
 Storage Module Disk (939X). 

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Contents are DOS.D 2.6, the update for 2.6.1, and various utlity's. Also the datashare software is present.

All is untested, as I lack the appropriate hardware.
Some files had dropouts, so user beware...


jos.dreesen@greenmail.ch 
November 2023