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DOS Plus (erroneously also known as DOS+) is an operating system written by Digital Research, first released in 1985. It can be seen as an intermediate step between CP/M-86 and DR-DOS. It is able to run programs written for either CP/M-86 or MS-DOS 2.11, and can read and write the floppy formats used by both these systems. Up to four CP/M-86 programs can be multitasked, but only one DOS program can be run at a time. ==User interface== DOS Plus attempts to present the same command-line interface as MS-DOS. Like MS-DOS, it has a command-line interpreter called COMMAND.COM (alternative name DOSPLUS.COM). There is an AUTOEXEC.BAT file, but no CONFIG.SYS (except for FIDDLOAD, an extension to load some field-installable device drivers in some versions of DOS Plus 2.1). The major difference the user will notice is that the bottom line of the screen contains status information similar to:DDT86 ALARM UK8 PRN=LPT1 Num 10:17:30 The left-hand side of the status bar shows running processes. The leftmost one will be visible on the screen; the others (if any) are running in the background. The right-hand side shows the keyboard layout in use (UK8 in the above example), the printer port assignment, the keyboard caps lock and num lock status, and the current time. If a DOS program is running, the status line is not shown. DOS programs cannot be run in the background. The keyboard layout in use can be changed by pressing Ctrl, Alt and one of the function keys F1-F5. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DOS Plus」の詳細全文を読む スポンサード リンク
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