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Virtual DOS machines can operate either exclusively through typical software emulation methods (e.g. dynamic recompilation) or can rely on the virtual 8086 mode of the Intel 80386 processor, which allows real mode 8086 software to run in a controlled environment by catching all operations which involve accessing protected hardware and forwarding them to the normal operating system (as exceptions).
MASM 6.1 and the 16-bit version of the Visual C++ 1.0 compiler were Win32 applications written for a beta version of Windows NT that was bound with the TNT DOS Extender. The Win32 executables referenced functions such as RtlExAllocateHeap in ntdll.dll, which did not exist in the final ntdll.dll, so if Windows even allowed you to run it (with a ...
In other words, Phar Lap created an OS/2 compatibility box for DOS. A 16-bit protected-mode DOS application can be built by compiling it with Microsoft C under DOS, specifying that an OS/2 program should be built, and then executing the resulting file on DOS with the aid of 286|DOS-Extender. With Lotus and Microsoft using DOS extenders, an ...
Concurrent DOS 286, Concurrent DOS 68K and FlexOS were designed by Francis "Frank" R. Holsworth (using siglum FRH). [5] [6] Like Portable CP/M, Concurrent DOS 286, Concurrent DOS 68K and Concurrent DOS V60, [1] [7] FlexOS was written in C for higher portability across hardware platforms, and it featured very low interrupt latency and fast context switching.
dbDOS VM Virtual Machine (dbDOS VM); The dbDOS VM or VM stands for Virtual Machine and with dbDOS it is a DOS emulation that allows products developed for DOS-based applications to run inside the virtual machine. The VM supports the Windows Operating Systems (XP, 2003, Vista, 2008, 7, 8, 8.1) in either 32- or 64-bit editions.
In computing, Windows on Windows (commonly referred to as WOW) [1] [2] [3] is a discontinued compatibility layer of 32-bit versions of the Windows NT family of operating systems since 1993 with the release of Windows NT 3.1, which extends NTVDM to provide limited support for running legacy 16-bit programs written for Windows 3.x or earlier.
VM/386 is a multitasking Multi-user environment or 'control program' [1] that took early advantage of the capabilities of Intel's 386 processor. By utilizing Virtual 8086 mode, users were able to run their existing text-based and graphical DOS software in safely separate environments.
DOS 286 or DOS/286 may refer to: Concurrent DOS 286, a Digital Research CP/M- and DOS-compatible multiuser multitasking operating system variant since 1985; FlexOS 286, a Digital Research FlexOS operating system variant since 1986; OS/2 1.0, an IBM and Microsoft operating system and then-times supposed-to-be successor of MS-DOS/PC DOS since 1987