Bochs v2.6 Pre1 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 v2.6 Pre1 Changelog:

- CPU - Implemented EPT A/D extensions support. Bochs is fully aligned with the latest published revision of Intel Architecture Manual (revision 043) now. - Implemented ADX (ADCX/ADOX) instructions support, the feature can be enabled using .bochsrc CPUID option. - Another 10% CPU emulation speedup with even more optimal lazy flags handling and stack access optimizations - Support for AMD's SVM hardware emulation in Bochs CPU, to enable configure with --enable-svm option - Implemented AMD Extended XAPIC support, to enable set .bochsrc CPU APIC option to 'xapic_ext' ! Added Corei5 750 (Lynnfield) configuration to the CPUDB ! Added Turion64 (Tyler) configuration to the CPUDB ! Added AMD Phenom X3 8650 (Toliman) configuration to the CPUDB ! Added Corei7 3770K (Ivy Bridge) configuration to the CPUDB - Bugfixes for CPU emulation correctness and stability (critical fixes in APIC/X2APIC, VMX and AVX/XOP emulation) - Bochs Debugger and Instrumentation - Implemented new debugger command 'info device [string]' that shows the state of the device specified in 'string' - Improved debug dump for ne2k, pci, pic and vga/cirrus devices. Added debug dump for pci2isa, i/o apic, cmos, pit, floppy and dma devices. - Added TLB to CPU param tree - now it can be browsed from Bochs internal debugger and Bochs debugger GUI through param tree interfaces - Implemented 'writemem' debugger command to dump virtual memory block starting from selected linear address into a file - Updated definition of instrumentation callbacks, see description in instrumentation.txt / Fixed instrumentation examples - Configure and compile - Moved disk imaging, networking, sound and USB devices to subdirectories in the iodev folder. - pcidev: enable support for Linux kernel 3.x (Debian patch by Guillem Jover) - debugger: generate parser / lexer files only if all required tools are present - Config interface - Added support for direct device plugin loading with bochsrc directive for devices which have the same name for the plugin and config option. - The bochsrc option 'plugin_ctrl' can now be used to load/unload optional plugins directly when parsing the config file or command line. See the bochsrc sample for supported devices. - Moved bochsrc parsing / writing and config parameter handling for networking, sound and USB devices to the plugin device code. The options are only available when the corresponding plugin device is loaded. - Added ability to set log action per device from .bochsrc. - Added new command line option '-noconsole' to disable the console window on Windows host. - Renamed PCI Pseudo NIC option to "pcipnic" (for direct plugin loading) - Moved several related options to the new "keyboard" bochsrc option. - Added new parameter 'rtc_sync' for the 'clock' option. If this option is enabled together with the realtime synchronization, the RTC runs at realtime speed. - Moved MWAIT_IS_NOP bochsrc option from CPUID to CPU so it can be set even if cpu was configured using pre-defined CPUDB profile. - Allow larger CPU 'quantum' values when emulating SMP systems for speed (quantum values up to 32 are allowed now). - I/O Devices - Networking - Ported Intel(R) 82540EM Gigabit Ethernet adapter emulation from Qemu, to enable configure with option --enable-e1000 - Added PCI network boot ROM support to all network adapters - Added TFTP support to the 'slirp' networking module - PCI - added "auto-assign to PCI slot" feature for PCI-only devices - DMA - Added the capability to transfer more then one byte / word per ISA DMA cycle - VGA - Major rewrite of the vga / cirrus code: - vgacore (shared standard VGA emulation code) - vga (Bochs VBE and PCI VGA) - cirrus (CL-GD 5430 ISA / CL-GD 5446 PCI) - Added VGA graphics blinking support - More accurate vertical and horizontal retrace emulation (based on the DOSBox implementation) - hard drive / hdimage - added new disk image mode 'vpc' for VirtualPC images - undoable mode: added coherency check (flat image size and timestamp) - sparse mode: fixed read support - Sound - implemented PC speaker beep using the lowlevel sound interface - added SDL audio output support - ROM BIOS - improved PCI boot ROM support (for VGA and other devices) - added MADT entry for Interrupt Source Override to ACPI tables - GUI and display libraries - implemented "auto-off" timer for status LEDs indicating a data transfer - Implemented "hideIPS" option in sdl and wx libraries - Added support for sending absolute mouse position values from the gui if an absolute pointing device (USB tablet) is active (rfb, sdl, win32, wx, x). - Gui debugger now supported when using sdl gui on Windows - Tools - bxcommit: added support for converting growing to flat mode images - bxcommit: support command line options and non-interactive (quiet) mode - bximage: increased maximum disk size to 8 TB - SF patches applied [3540389] Patch 5 : Change memory reference functions argument order by Yeong-uk Jo [3539254] Patch 4 : Memory reference optimization 2 by Yeong-uk Jo [3539251] Patch 3 : Memory reference optimization by Yeong-uk Jo [3539237] Patch 2 : Some optimization by Yeong-uk Jo [3539228] Patch 1 : ROM BIOS Compatibility patch by Yeong-uk Jo [3505209] Fixed combo box size by Konrad Grochowski [2864391] Gui debugger default regs by Thomas Nilsen [3486555] Fix critical stack leak in Win32 GUI by Carlo Bramini - these S.F. bugs were closed/fixed [3555237] NE2000 doesn't compile on OS/X [3553168] X doesn't build in latest code on OS/X [3550175] Crash when saving snapshot to directory instead of file [3548109] VMX State Not Restored After Entering SMM on 32-bit Systems [3548108] VMEXIT Instruction Length Not Always Getting Updated [3545941] Typo in preprocessor symbol [3538731] Missing CR8 register [3538574] Missing XD flag ( Execute Disable ) when showing PTEs [3537556] Missing initializations [3537309] Unable to use the debug GUI with SDL and plugins [3537473] GUI debugger only shows 32-bit CRx registers in x86-64 mode [3533426] UHCI PCI interrupts [3459359] svga cirrus initialization [3535228] info gdt does not show long mode segments [3531806] Bochs crashes (SIGSEGV) when starting via ssh console [3531807] Various missing initialization values reported by Valgrind [635789] mapping mode 0 not supported [3307201] BOCHS panics when execute HBIOS.COM [3528809] IO APIC index register width [3528516] Missing #if in soundmod.h [3526069] MADT:Interrupt Source Override missed [3518753] update dump after manual chages to memory contents [3516859] bug in svn e1000 module [3516029] stepping not working in debugger GUI in case of smp vm [3510403] closing config dialog box closes entire simulator [3459998] Bochs cannot be compiled outside the source tree [2905969] can't use --enable-gdb-stub on vs2008 [3294001] Bochs GUI doesn't appear properly for 2nd Bochs copy [3493315] Changing VGA 9/8 dot mode causes screen corruption - these S.F. feature requests were closed/implemented [3540441] automatically enable devices in plugin control [1251456] command line method to query bochs for features [3409396] sdl sound [3519794] debugger's ability to save physical/linear memory dumps [1429612] Idea how to speedup simulation - stack direct access [1703452] Other Network Devices? [2919376] Disable show the console window [534271] can't set log action by device (bochsrc)

Download: Bochs v2.6 Pre1
Source: Here