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, Pentium Pro or AMD64 CPU, including optional MMX, SSE, SSE2 and 3DNow! instructions. Bochs is capable of running most Operating Systems inside the emulation including Linux, Windows95, DOS, and WindowsNT.
Software License: Open Source
Operating Systems Support: Microsoft Windows
Download Link: Bochs 2.2.5
Homepage: Bochs
Version ChangeLog:
fixed XMM registers restore in FXRSTOR instruction (Andrej Palkovsky)
print registers dump to the log if tripple fault occured
fixed PANIC in LTR instruction (Stanislav)
added virtual 8086 mode extensions (VME) implementation, to enable
configure with --enable-vme (Stanislav)
flush caches and TLBs when executing WBINVD and INVD instructions
do not modify segment limit and AR bytes when modifying segment
register in real mode (support for unreal mode)
fixed init/reset values for LDTR and TR registers
reimplemented hardware task switching mechanism (Stanislav)
generate #GP(0) when fetching instruction cross segment boundary
implemented call_far/ret_far/jmp_far instructions in long mode
fixed IRET operation in long mode
fixed bug prevented setting of NXE/FFXSR bits in MSR.EFER register
implemented RDTSCP instruction
do not check CS.limit when prefetching instructions in long mode
fixed masked write instructions (MASKMOVQ/MASKMOVDQU) in long mode
fetchdecode fixes for x86-64
Fixed bug in changing local APIC id (Stanislav)
Fixed reading of IRR/ISR/TMR registers (patch by wmrieker)
Implemented spurious interrupt register (Stanislav, patch by wmrieker)
Fixed interrupt delivery bug (anonymous #SF patch)
Correctly implemented ESR APIC register (Stanislav)
Fixed bug in bochs debugger caused breakpoints doesn't fire sometimes
(Alexander Krisak)
watchpoints in device memory fixed (Nickolai Zeldovich)
new debug interface to access Bochs CPU general purpose registers
with support for x86-64
Fixed disassembly for FCOMI/FUCOMI instructions
Full x86-64 support in disassembler. The disassembler module extended
to support x86-64 extensions. Still limited by Bochs debugger which
is not supporting x86-64 at all ;(
memory management prepared for large BIOS images (up to 512k)
slowdown timer sleep rate fixed (now using 1 msec on all platforms)
some device specific parameter handlers moved into the device code
new serial mode 'socket' connects a network socket (#SF patch by Andrew Backer)
assign a unique serial number to each drive (fixes harddrive detection
problems with Linux kernels 2.6.x: "ignoring undecoded slave")
geometry autodetection for 'flat' hard disk images added. Works with
images created with bximage (heads = 16, sectors per track = 63)
ATAPI command 'read cd' implemented, some other commands improved
cdrom read block function now tries up to 3 times before giving up
emulation of raw cdrom reads added, some other lowlevel cdrom fixes
IDE busmaster DMA feature for harddisks and cdroms completed and enabled
disk image size limit changed from 32 to 127 GB
split ATA/ATAPI emulation code and image handling code
fixes for OS/2 (patch by Robin Kay)
disk change line behaviour fixed (initial patch by Ben Lunt)
end-of-track (EOT) condition handling implemented
more accurate timing for read/write data and format track commands using
a motor speed of 300 RPM
timing of recalibrate and seek commands now depends on the step rate,
date rate and the steps to do
floppy controller type changed to 82077AA
RTC 12-hour and binary mode implemented
number of CMOS registers changed from 64 to 128
bochsrc option 'cmosimage' improved
save cmos image on exit if enabled
simple speaker support for OS X added (patch by brianonn@telus.net)
BeOS boot failure fix in the PCI IDE code
don't register i/o and memory regions during PCI probe
memory allocation for vga extensions fixed
some bugfixes by Ben Lunt (mouse and keypad are usable now)
VDE networking module now enabled on Linux
new syntax for the userbutton shortcut string and more keys supported
fixed keycode generation for right alt/ctrl/shift keys
runtime dialog is now a property sheet
simple dialog boxes for the "ask" and "user shortcut" feature implemented
Slovenian keymap added (contributed by Mitja Ursic)
ask dialog is now enabled by default for win32, wx and x display libraries
bochsrc option floppy_command_delay is obsolete now (floppy timing now based
on hardware specs)
floppy image size detection now available in the whole config interface
some device specific parameter handlers moved into the device code
calculate BIOS ROM start address from image if not specified
PCI i/o and memory base address initialization added
several keyboard interrupt handler fixes (e.g. patch by japheth)
several floppy fixes (e.g. OS/2 works with patch by Robin Kay)
some more APM functions added
Updated LGPL'd VGABIOS to version 0.5d
generate SMP specific tables dynamicly by the Bochs memory init code
[1389776] Disk sizes over 64 Gbytes by Andrzej Zaborowski
[1359162] disasm support for x86-64 by Stanislav Shwartsman
[857235] task priority and other APIC bugs, etc by wmrieker
[1359011] build breaks for 386 + debugger + disasm by shirokuma
[1352761] Infinite loop when trying to debug a triple exception
[1311170] small APIC bug fix (interrupt sent to the wrong CPU)
[1309763] Watchpoints don't work in device memory by Nickolai Zeldovich
[1294930] change line status on floppy by Ben Lunt
[1282033] SSE FXRESTORE not working correctly by Ondrej Palkovsky
[816979] wget generalizations by Lyndon Nerenberg
[1214886] No more pageWriteStamp / unified icache by H. Johansson
[1107945] com->socket redirection support by Andrew Backer
[669180] win95 install : unknown SET FEATURES subcommand 0x03
[1346692] bochs 2.2.1 VGA BIOS error
[1354963] floppy in KolibriOS
[1378204] error: bochs-2.2.1, --enable-sb16, --disable-gameport
[1368412] VDE problems in BOCHS
[533446] CPU and APIC devices appear twice
[1000796] bximage fails to create image of specified size
[1170793] Quarterdeck QEMM doesn't work
[923704] Multiple opcode prefixes don't reflect Trap 13
[1166392] DocBook/documentation issues
[1368239] broken grater than 4GB size of sparse type hd image
[1365830] i386 compile breaks on paging
[427550] Incomplete IRETD implementation
[1215081] MSVC workspace STILL not fixed
[736279] Jump to Task
[1356488] FD change fail & occur error
[957615] [CPU ] prefetch: RIP > CS.limit
[1353866] not booting linux-2.6.14
[1351667] load32bitOSImage does not work with --enable-x86-debugger
[1217476] Incorrect (?) handling of segment registers in real mode
[1184711] OS2 DOS crash [2.2.pre2]
[624330] support for disks > 32GiB
[1348368] bochs 2.2.1 bximage error
[1342081] Configuration Menu option failed
[1138616] OS/2 Warp 4 hangs when booting
[1049840] mouse and video conflict
[1164570] Unable to perform Fedora Core 4 test 1 installation
[1183201] Windows 2000 (MSDN build 2150?) does not completely install
[1194284] Can't boot from CD-ROM (Windows NT)
[962969] Windows NT crashes while trying to intall them.
[1054594] WinXP install halts (redo)
[1153107] Windows XP fails with BSOD on 'vga'
[938518] Win XP installation fails
[645420] getHostMemAddr vetoed direct read
[1179985] MS XENIX: >>PANIC<< VGABIOS panic at vgabios.c, line 0
[1329600] WBINVD and INVD should flush caches and TLB
[638924] eliminate BX_USE_CONFIG_INTERFACE
[1048711] Funny behaviour with CTRL
[1288450] keyboard BIOS error
[1310706] Keyboard - about key SHIFT
[1295981] Ubuntu 5.04 Live-CD won't boot in Bochs
[879047] APIC timer behavior different before reset and after
[1188506] I still can't install the german Windows XP!
[1301847] Windows XP dosn't boot - FXRSTOR problem ?
[661259] does not boot QNX under WinX
[924412] Keyboard lock states all whacked
[681127] MIPSpro compiler (IRIX) is allergic to ^M
[1285923] BIOS keyboard handler
[516639] ATA controller revisited...
[657918] does not boot BeOS under WinX
[649245] BeOS CD locks halfway on boot
[1094385] Attachment for bug 1090339 (beos failure)
[1183196] BeOS 4.5 developer CD does not install
[1090339] BeOS fails to boot
[639484] panics when int 13 is called
[711701] divide by zero
[704295] ATAPI/BIOS call missing
[682856] hard drive problems
[627691] Cursor keys problem
[588011] keyboard not working
[542260] os/2 warp crashes with floppy handling
[1273878] SB16 doesn't work in pure DOS
[542254] OS/2 FDC driver dies
[1099610] Windows 98 SE Does not install
[875479] cr3 problem on task switch
[731423] NE2000 causing PANIC on Win2K detection
[1156155] bochs fails to boot plan9 iso
[1251979] --enable-cpu-level=3 should assume --without-fpu
[1257538] Interupt 15h 83h - set wait event interval
[658396] Panic for DR DOS emm386
[679339] /? doesn't divulge Bochs command-line syntax
[1167016] call/jump/return_protected doesn't support x86-64
[1252432] Mac OS X compile bug
[881442] Bochs 2.1 PANIC when loading DOS Turbo Pascal protected mode
[1249324] Boch2.2.1 Buffer Overfollow in void bx_local_apic_c::init ()
[1197144] 'make install' has dependency on wget
[1079595] LTR:386TSS: loading tr.limit < 103
[1244070] Compilation Error in gui/rfb.cc
[761707] CPU error when trying to start Privateer
[517281] Crash running Privateer in DOS...
