Editing Multiuser DOS (section)

==={{anchor|CDOS68K}}Concurrent DOS 68K and FlexOS 68K===
Efforts being part of a cooperation with [[Motorola]] since 1984<ref name="Gallant_1984"/><ref name="DRI_1984_MicroNotes1"/> led to the development of Concurrent DOS 68K in [[Austin, Texas|Austin]], Texas, as a successor to [[CP/M-68K]] written in [[C language|C]]. One of its main architects was Francis "Frank" R. Holsworth<!-- born 19??-09-04 https://amaus.net/static/S100/software/DRI/Digital%20Dialogue/03x04%20198408%20Digital%20Dialogue.pdf --> (known by his initials, FRH).<ref name="Wein_2002"/><ref name="Holsworth_2006"/> Concurrent DOS 68K 1.0 became available for OEM evaluation in early 1985<!-- possibly even late 1984 -->.<ref name="Knox_1986_CDOS68K"/><ref name="Knox_1987_DRI"/> The effort received considerable funding worth several million dollars from Motorola,<ref name="Knox_1986_CDOS68K"/> and was designed for their [[68000]]/[[68010]] processors. Like the earlier<!-- 1984 --> [[GEMDOS]] system for 68000 processors it initially ran on the Motorola [[VME board|VME]]/10 development system<!-- but was also adapted to Compupro systems -->.<ref name="DRI_1984_MicroNotes1"/> Concurrent DOS 68K 1.20/1.21 was available in April 1986,<ref name="DRI_1986_CDOS68K-1"/><ref name="DRI_1986_CDOS68K-2"/><ref name="DRI_1986_CDOS68K-3"/> offered for about {{val|200000|u=dollars}} to OEMs.<ref name="Knox_1986_CDOS68K"/> This system evolved into [[FlexOS 68K]] in late 1986.

Known versions include:

* Concurrent DOS 68K 1.0 (1985)<ref name="Knox_1986_CDOS68K"/>
* Concurrent DOS 68K 1.1<!-- mentioned in VMCONFIG.C --><ref name="DRI_1986_CDOS68K-2"/>
* Concurrent DOS 68K 1.20 (April 1986,<ref name="DRI_1986_CDOS68K-1"/><ref name="DRI_1986_CDOS68K-2"/><ref name="DRI_1986_CDOS68K-3"/> 1986-05-27<!-- mentioned in VMCONFIG.C --><ref name="DRI_1986_CDOS68K-2"/>)
* Concurrent DOS 68K 1.21 (1986)<ref name="DRI_1986_CDOS68K-1"/><ref name="DRI_1986_CDOS68K-2"/><ref name="DRI_1986_CDOS68K-3"/>