PC-MOS/386

The last commercial version produced was v5.01, compatible with MS-DOS 5. It required a memory management unit (MMU) to support memory protection, so was not compatible with earlier 8086 and 8088 processors. MMU support for 286-class machines was provided using a proprietary hardware shim inserted between the processor and its socket. 386 machines did not require any special hardware. There was a year 2000 problem-like error in this operating system, first manifesting on 1 August 2012 rather than 1 January 2000; files created on the system after this date would no longer work. ==Commands==

Commands supported by PC-MOS Version 4 are: General commands • ADDDEV • ALIAS • BREAK • CD • CLS • COMMAND • COMPFILE • COPY • DATE • DIR • DIRMAP • DISKCOPY • DISKID • DOT • ENVSIZE • ERASE • EXCEPT • EXPORT • FILEMODE • FORMAT • HELP • IMPORT • MD • MORE • MSORT • MSYS • ONLY • PATH • PROMPT • RD • REL • REMDEV • RENAME • SEARCH • SET • SWITCH • TIME • TYPE • VERIFY • WVER Batch file commands • ABORT • ADDTASK • AUTOCD • BATECHO • CALL • RETURN • ECHO • FLUSH • FOR • GOTO • IF • INSERT • KEY • NEXT • PAUSE • REM • STOP • SWITCH • TEXT • ENDTEXT Multitask/Multiuser commands • ADDTASK • KEYMAP • MOS • MOSADM • REMTASK Print spooler • PRINT • SPOOL Security commands • CLASS • SIGNOFF • SIGNON Installation, administration and debug commands • DEBUG • ED • HDSETUP ==See also==