Projects / Bochs


Bochs is a portable x86 PC emulation software package that emulates enough of the x86 CPU, related AT hardware, and BIOS to run DOS, Windows 95, Linux, FreeBSD, and other OS's, all on your workstation.


Recent releases

  •  04 Mar 2013 12:48

    Release Notes: Many enhancements were made, such various CPU emulation speed-ups, support for new x86 ISA extensions, support for AMD's SVM hardware emulation, PCI network boot ROM support for all network adapters, new and improved devices, and much more. Various bugs were fixed.

    •  12 May 2010 09:45

      Release Notes: The configuration and CPU subsystems were reworked, allowing you to enable or disable CPU options at runtime through .bochsrc. Bugs were fixed for CPU emulation correctness and stability. X2APIC extensions were implemented. Intel VMXx2 extensions were implemented. New features include Extended VMX capability MSRs, APIC Virtualization, X2APIC Virtualization, Extended Page Tables (EPT), VPID, Unrestricted Guests, and new VMX controls. The PCLMULQDQ AES instruction was implemented. The Bochs internal debugger functionality was extended. USB HP DeskJet 920C printer device emulation was added.

      •  04 Mar 2003 11:10

        Release Notes: This release fixes a possible segfault in wxWindows, the CD-ROM read_toc() function for *BSD, booting from CD-ROM for NetBSD, the CMOS checksum, and the "refresh bit" behaviour in pit. It also fixes .bochsrc parsing, VGA resize/redraw problems, compilation issues on Irix and Tru64, some MMX/SSE bugs, and bugs in instrumentation.

        •  12 Jan 2003 19:43

          Release Notes: Minor bugfixes and documentation updates.

          •  30 Dec 2002 07:07

            Release Notes: This release features a speedup for the emulation by 2x, and new plugin devices and GUIs. Now you can compile with many more options, and choose between them at runtime. Emulation of AMD x86-64, MMX, SSE, and SSE2 instructions was added, along with a wxWindows port and an SVGAlib port. There are improvements to many I/O devices: Bochs now supports up to 8 hard disks/CDROMs, a TUN/TAP network interface, and 360k floppies. The MacOSX/Carbon interface was improved and the MacOS9 port was updated. The GDB remote stub allows symbolic debugging with Bochs simulation.

            Recent comments

            15 Feb 2002 08:27 elucidus

            Physical Floppy Access
            On Win32, to use a real floppy drive you need this:
            floppya: 1_44=a:, status=inserted

            line in your .bochsrc file.

            You can also specify an image file to load as a virtual floppy.
            floppya: 1_44=nameofimage.img, status=inserted

            13 May 2001 15:30 uninetsolutions

            Re: Seems to have sped up quite a bit

            > Oh, but it being $$-ware makes it suck
            > bigtime, I must admit.

            I am happy to report that as of the first quarter of
            2000, Bochs is now under the LGPL license!


            13 Jan 1999 05:39 barsnick

            Seems to have sped up quite a bit
            I had looked at bochs quite some time ago, and it was amazingly slow. I checked out the 1999 version now, and it's sped up quite a bit. It used to take almost an hour to boot ODDS, now it's down to a few minutes (on a Sparc Ultra 5 running SunOS5.5.1). 1.18 BogoMIPS!

            The real advantage is that it runs on non-x86 systems (unlike DOSemu) where you can't just add another partition for a M$ OS. And it emulates an i386 (instead of an i8086 like pcemu, which is quite quick) and can therefore run more complex OSs than just DOS. ;-)

            Oh, but it being $$-ware makes it suck bigtime, I must admit.


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