Bochs v2.5.1 is released. Bochs is a highly portable open source IA-32 (x86) PC emulator written in C++, that runs on most popular platforms. It includes emulation of the Intel x86 CPU, common I/O devices, and a custom BIOS. Currently, Bochs can be compiled to emulate a 386, 486, Pentium/PentiumII/PentiumIII/Pentium4 or x86-64 CPU including optional MMX, SSEx and 3DNow! instructions.

Bochs is capable of running most Operating Systems inside the emulation including Linux, DOS, Windows® 95/98 and Windows® NT/2000/XP or Windows Vista. Bochs was written by Kevin Lawton and is currently maintained by this project.

Bochs can be compiled and used in a variety of modes, some which are still in development. The 'typical' use of bochs is to provide complete x86 PC emulation, including the x86 processor, hardware devices, and memory. This allows you to run OS's and software within the emulator on your workstation, much like you have a machine inside of a machine. For instance, let's say your workstation is a Unix/X11 workstation, but you want to run Win'95 applications. Bochs will allow you to run Win 95 and associated software on your Unix/X11 workstation, displaying a window on your workstation, simulating a monitor on a PC.

Bochs v2.5.1 Changelog:

Changes in 2.5.1 (January 6, 2012): - CPU / CPUDB ! Added Athlon64 (Venice) configuration to the CPUDB - BMI: fixed EFLAGS after BMI instructions - MSR: access to AMD extended MSR space was impossible due to a bug in RDMSR/WRMSR - VMX: fixed VMFUNC instruction behavior to align with Intel SDM revision 041 - VMX: fixed Bochs PANIC when doing I/O access crossing VMX I/O permission bitmaps - VMX: fixed VirtualBox VMX guest Guru Meditation - FS.BASE got corrupted after saving/restoring unusable FS selector - VMX: fixed VirtualBox failures with VMX+EPT enabled - Better report of supported CPUID features when not using pre-defined CPUID profile - Debugger / Instrumentation - fixed typo - closing SF bug [3461405] step all command fails in SMP mode - instrumentation: added special indication for indirect call/jump - Configure and compile - fixed compilation err in instrumentation call (tasking.cc) - fixed compilation err with x86 hw breakpoint enabled and CPU_LEVEL < 6 - fixed compilation issue under win32 --with-nogui - added missing dependencies for cdrom_osx.o - removed very old deprecated configure options from configure script - I/O Devices - fixed possible failures of PCI DMA transfers - VVFAT: several fixes in the optional write support (passes test with XP) - USB UHCI: some fixes to make it work in XP guest - removed devices 'acpi', 'ioapic' and 'pci_ide' from optional plugin control to avoid trouble - Config interface / GUI and display libraries - added VMX .bochsrc option to control VMX support on runtime - fix for x86-64 .bochsrc option parsing (patch from @SF) - fix for @SF bug: Crash on WIN2K - ID: 3454214 - added 'nokeyrepeat' option for the SDL and win32 gui

Download: Bochs v2.5.1
Source: Here