The ICL DRS PWS (1987) and the ICL DRS PWS 386 (1988).
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The ICL DRS PWS M60 has a 80286 CPU (1987) and the M80 (1988) a 80386 CPU.
ICL's first release of the DRS PWS in 1987 came with ICL modified Multitasking MS-DOS 4.0.
This was followed with Multitasking MS-DOS 4.10 in 1988, which had been especially written by MS for ICL.
This was just for the DRS PWS. The names of the two machines were then changed to DRS M60 and DRS M80.
Both the MS/ICL Multitasking MS-DOS 4.0 and MS/ICL Multitasking MS-DOS 4.10 are safe, alive and well here.
PWS support both 1.2meg and 1.44meg floppy drives, having created sets on 1.44meg disks to boot on 1.44meg drives.
These versions of MS-DOS will only boot on DRS M60 or DRS M80 machines due to BIOS and hardware requirements.
Having checked the Museum software archives I see that MS-DOS R. 3.21z is also here for DRS M60 or DRS M80 machines.