DOSEMU

DOSEMU
DOSEMU Running on C:\
Original author(s)	DOSEMU Team
Initial release	September 3, 1992;32 years ago (1992-09-03) [1]
Final release	1.4.0 / May 5, 2007;18 years ago (2007-05-05)
Repository	sf.net/p/dosemu/code/
Operating system	Linux
Type	Compatibility layer
License	GPL
Website	www.dosemu.org

dosemu2
Preview release	2.0pre9 / 29 January 2022;3 years ago (2022-01-29)
Repository	github.com/dosemu2/dosemu2
Website	dosemu2.github.io/dosemu2/

DOSEMU, stylized as dosemu, is a compatibility layer software package that enables DOS operating systems (e.g., MS-DOS, DR-DOS, FreeDOS) and application software to run atop Linux on x86-based PCs (IBM PC compatible computers).

Features

It uses a combination of hardware-assisted virtualization features and high-level emulation. It can thus achieve nearly native speed for 8086-compatible DOS operating systems and applications on x86 compatible processors, and for DOS Protected Mode Interface (DPMI) applications on x86 compatible processors as well as on x86-64 processors. DOSEMU includes an 8086 processor emulator for use with real-mode applications in x86-64 long mode.

DOSEMU is only available for x86 and x86-64 Linux systems (Linux 3.15 x86-64 systems cannot enter DPMI by default. This is fixed in 3.16). ^[2]

DOSEMU is an option for people who need or want to continue to use legacy DOS software; in some cases virtualisation is good enough to drive external hardware such as device programmers connected to the parallel port. According to its manual, "dosemu" is a user-level program which uses certain special features of the Linux kernel and the 80386 processor to run DOS in a DOS box. The DOS box, relying on a combination of hardware and software, has these abilities:

• Virtualize all input-output and processor control instructions
• Supports the word size and addressing modes of the iAPX86 processor family's "real mode", while still running within the full protected mode environment
• Trap all DOS and BIOS system calls and emulate such calls as needed for proper operation and good performance
• Simulate a hardware environment over which DOS programs are accustomed to having control.
• Provide DOS services through native Linux services; for example, dosemu can provide a virtual hard disk drive which is actually a Linux directory hierarchy. ^[3]
• API-level support for Packet driver, ^[4] IPX, Berkeley sockets (dosnet). ^{[5] [6]}

See also

• Free and open-source software portal

• Comparison of platform virtualization software
• Virtual DOS machine
• DOSBox
• Wine
• FreeDOS

References

1. "DOSEMU for Linux / History / Browse Commits".
2. "#751632 dosemu: DPMI fails to initialize on x86_64 with linux 3.15". 140715 bugs.debian.org
3. "The dosemu HOWTO". Archived from the original on 2012-12-25. 090430 dosemu.sourceforge.net
4. "dosemu v1.3.5 source". 090430 prdownloads.sourceforge.net src/dosext/net/net/pktnew.c
5. "dosemu v1.4.0 source". 2007-05-05. Retrieved 2016-04-06. src/dosext/net/net/ipx.c src/dosext/net/v-net/dosnet.c
6. "The DOSEMU team is proud to announce DOSEMU 1.4.0". 2007-05-05. Archived from the original on March 15, 2016. Retrieved 2016-04-06. NetWare and other network connectivity via built-in IPX and pktdrvr support /../ the dosemu-freedos binary package starts a DOS-"C:\>"-Drive 'out-of-the-box' in a normal user's $HOME directory and runs without any further configuration (no root rights needed)

External links

• Official website
• dosemu2