What is Bochs 2.1.1?

 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. Bochs can be compiled to emulate many different x86 CPUs, from early 386 to the most recent x86-64 Intel and AMD processors which may even not reached the market yet.
Bochs is capable of running most Operating Systems inside the emulation including Linux, DOS or Microsoft Windows. Bochs was originally 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.
 

Download Bochs 2.1.1 for Mac

Architecture

IBM PowerPC

System Requirements

From Mac OS 9.0

Compatibility notes

this is taken from the Bochs official changelog:

 

 Changes in 2.1.1 (February 8, 2004):
 
 - fix bug in int15h function 0xe820 (Christian Neubert)
 - fix vmware3 disk support on big-endian platforms (Christophe Bothamy)
 - fix conditions for NM exception on FWAIT instruction (Christophe)
 - fix symbol conflict in rfb and x display libraries (Volker Ruppert)
 - allow 16 bit writes to ne2k page 0 (Kenneth Stailey)
 - notify display libraries on change of bpp (Volker)
 - fix bug in int13h function 0x10 (Volker)
 - fix floppy dialog error on win2k (Volker)
 - fix adress check in TSS IO permission bitmap (Christophe)
 - fix buffer overflow vulnerability pointed out by SeSoX (Christophe)
 - updates for MacOS compile (Daniel Gimpelevich)
 
 -------------------------------------------------------------------------
 Changes in 2.1 (January 9, 2004):
 
 Brief summary :
 - New disassembler
 - 3DNow!/SSE/SSE2/PNI instruction support
 - Vmware3/Sparse/Undoable/Growing harddisk images support
 - many VGA emulation improvements (e.g. high/true color VBE modes added)
 - No more X11 vga font required
 
 Detailed change log :
 
 - CPU
   - added emulation of AMD 3DNow! instructions set. (Stanislav Shwartsman)
     Bochs now could decode all AMD 3DNow! instructions.
     Most of instructions still not implemented, but the basis already presents.
     Configure --enable-3dnow to enable 3DNow! support.
     Notes :
       - These instructions are not implemented yet:
         PFPNACC_PqQq, PF2IW_PqQq, PFNACC_PqQq, PFCMPGE_PqQq, PFMIN_PqQq,
         PFRCP_PqQq, PFRSQRT_PqQq, PFSUB_PqQq, PFADD_PqQq, PFCMPGT_PqQq,
         PFMAX_PqQq, PFRCPIT1_PqQq, PFRSQIT1_PqQq, PFSUBR_PqQq, PFACC_PqQq,
         PFCMPEQ_PqQq, PFMUL_PqQq, PFRCPIT2_PqQq
      - CPUID does not report 3DNow! instruction set.
   - added emulation of SSE/SSE2 floating point instructions. (Stanislav)
     All SSE/SSE2 floating point instructions are fully implemented using
     free softfloat library (including DAZ support and floating point
     exceptions). Correctness of the emulation checked with heavily random
     testing.
   - added emulation of SSE3 (PNI) instructions (Stanislav)
     Currently only 3 PNI opcodes still not implemented:
         FISTTP m16int, FISTTP m32int, FISTTP m64int
   - added P4 CPU support to CPUID instruction. (Stanislav)
   - fixed implementation of FXSAVE/FXRSTOR instructions. (Stanislav)
   - bugfix: unallowed lock prefix cases must cause #UD exception. (Stanislav)
   - fixed fetchdecode bug caused #UD in SYSENTER/SYSEXIT instructions
     in 32bit mode. (Stanislav)
   - fixed fetchdecode64 bug caused wrong decoding of opcodes containing
     BxImmediate_IvIw or BxImmediate_IwIb in x86-64. (Stanislav)
   - fixed bug in int01 (opcode 0xF1) emulation. (Vitaly Vorobyov)
   - fixed bug in x86 debugger with dr0-dr3 registers (Vitaly)
   - fixed bug with mov to/from dr register in v86mode.
     (now exception is generated (according to Intel documentation)
     instead of panic) (Vitaly)
   - fixed stack limit checking, now message is generated as BX_DEBUG,
     rather then BX_PANIC, and exception code is executed. (Vitaly)
   - instrumentation code updated. (Stanislav)
   - fix flaw in IO bitmap permission of TSS (Christophe Bothamy)
   - cpu resets on triple fault (Christophe)
   - remove calculation on cr3 in dtranslate_linear to increase
     emulation speed (Conn Clark)
   - numerous x86-64 fixes (Peter Tattam)
 
 - FPU
   - hundreds of bugfixes in FPU emulation after checking of the emulation
     with testfloat (Scott Duplichan).
     - Fixed cases:
         - floatx80_to_int32,   floatx80_to_float32
         - floatx80_to_float64, floatx80_round_to_int
         - floatx80_add,        floatx80_sub,
         - floatx80_mul,        floatx80_div
   - implemented FCMOVcc instructions (Stanislav)
   - 64-bit addressing support for x86-64 mode (Peter)
 
 - Disassembler
   - replaced Bochs disassember. New table-based disassembler fully supports
     all IA-32 instruction sets including all FPU/MMX/SSE/SSE2/SSE3 opcodes.
     (Stanislav)
 
 - I/O devices
   - general
     - i/o access mask implemented, unallowed cases are now handled in the devices
       code and cause a BX_ERROR (Volker Ruppert)
     - include slowdown timer as a runtime option (Christophe)
     - netBSD : fix serial, ethernet, cdrom (fredb, uebayasi and David Laight)
   - VGA
     - color depth 15, 16, 24 and 32 bpp supported by VBE (Volker and
       Christopher Nelson for 32 bpp on win32). Supported by sdl, x, win32 and wx.
     - SVGA mode 0x6A (800x600x4bpp) implemented (Volker)
     - new CGA graphics modes 640x200x1bpp and 160x100x4bpp (text mode 80x100) (Volker)
     - raster operations AND, OR and XOR in write mode 2 (based on SF patch #707931) (Volker)
     - 'split screen' in standard VGA graphics mode implemented (Volker)
     - 'double scan' and 'double width' now handled in the VGA code (Volker)
     - more accurate emulation of the horizontal and vertical retrace (Volker)
     - changeable start address and variable line length supported by all
       graphics modes (Volker)
     - VBE: preserve video memory feature implemented (Volker)
     - additional text mode features prepared (handled in the display library
       code) (Volker)
   - PCI
     - add experimental PCI VGA card (Mike Nordell)
     - add experimental PCI USB card (Ben Lunt)
   - Harddisks
     - per device selectable harddisk modes :
       - undoable, volatile, growing disks support (Christophe)
       - sparse disks support (justinSB)
       - vmware3 disks support (Sharvil Nanavati)
     - fix non detection of hard drives by minix2 (Christophe)
     - implement atapi command 0xA8 read (12)  (Christophe)
     - mode sense command updated (Hartmut Birr)
   - sb16
     - opl2 support enhanced (James E. Flemer)
   - ne2k
     - tap support for FreeBSD (Ronald Klop and Gen Otsuji)
     - fix when booting with grub (Keir Fraser)
   - cmos
     - date/time change support added (Volker)
     - UIP bit and divider chain reset implemented (Volker)
     - initial time can now be set to local time or utc (Christophe, Daniel Gimpelevich)
   - keyboard
     - keyboard reset function (0xff) now resets the keyboard (Volker)
   - gameport
     - new standard PC gameport device (real joystick connected on Linux and
       win32 only). Enable it with --enable-gameport or the SB16 emulation (Volker)
   - serial
     - FIFO emulation (UART type 16550A) implemented (Volker)
   - floppies
     - 160k,180k,320k floppies support (Ben Lunt)
 
 - display libraries
   - X11
     - onboard vgacard charmap usage (no need for external X11 vga font any more) (Christophe)
     - vgacard charmap change support (Christophe)
     - fix black stripes on partial exposes (Dirk Thierbach)
     - headerbar redraw optimizations (Dirk Thierbach)
     - external font files and their installation mechanism removed (Volker)
     - belgian keymap support (Wouter Verhelst, Eric Brasseur)
   - win32 + wx + x: new application/window icon (bochs.ico / icon_bochs.xpm) (Volker)
   - sdl + win32 + wx + x: new textmode features: variable line length,
     char width switch, horizontal and vertical pel panning (Volker)
   - win32 + wxMSW: key event handling rewritten (Volker)
   - win32: status bar at the bottom of the simulation window added (Volker)
   - wxMSW: resource problems fixed - wx dll plugin works now without errors (Volker)
   - term: variable line length and cursor enable/disable feature implemented (Volker)
   - rfb
     - textmode: charmap change, better cursor emulation, variable line length (Volker)
     - headerbar works now (power, reset and user button are okay) (Volker)
     - key event handling rewritten (Volker)
     - Bochs-RFB waits up to 30 seconds for a client connection. The emulation
       starts after connecting the client. (Volker)
   - carbon: Alt/Ctrl/Shift key handling rewritten & SysRq/Ctrl-Break key support added
     (Daniel)
 
 - configuration interface
   - gui dialogs as an extension of the textconfig interface on win32 added (Volker)
     * ask dialog
     * save text snapshot
     * user button shortcut
     * floppy image change
   - wxwindows configuration dialogs improved (Volker, Christophe)
 
 - support tools
   - bximage : added support for
     - growing disks (Christophe)
     - sparse disks (justinSB)
   - created bxcommit tool for undoable disk images (Christophe)
 
 - System BIOS :
   - fixed int15 function e801 (get memory size) (Christophe)
   - added int75_handler for FPU Dos Exceptions (Christophe)
   - added int16 function 0a (Get Keyboard ID) (Volker)
   - added support for ElTorito Harddisk-on-CD emulation (Christophe)
   - fixed ATA/Serial ioport conflict (Daniel)
 
 - VGA BIOS : updated to version 0.4c (Christophe)
 
 - configure script/compile/porting to other OSes/installation
   - fixes for compilation with MSVC (Andrew Zabolotny)
   - fixes for cross-compilation (Jeroen Janssen)
   - win32 nsis installer script updates (Volker)
   - small configure fixes for MacOS (Christophe)
   - optimizations & compile fixes for MacOS/X (Daniel)
 
 - configuration files. The following options have been deprecated :
   diskc, diskd, cdromd, time0, pit, newharddrivesupport.
 
 - documentation
   - already ported and obsolete parts of the old documentation removed (Volker)
   - user documentation updated and extended :
     - improved section "What does Bochs need" (Volker)
     - command line arguments (Volker)
     - search order for the configuration file (Volker)
     - the configuration interface 'textconfig' (Volker)
     - FreeDOS Beta 8 installation instructions (Volker)
     - disk modes (Christophe)
     - LBA translation  (Christophe)
     - cdboot error codes (Christophe)
     - SCO OpenServer install section (Carl Sopchak)
     - MacOS-X DMG install guide (Aard Vark)
     - update Win98 install guide (Dirk Thierbach)
 
 - SF patches applied
   #658950  Bug in FPU                                                  (Anonymous)
   #678117  build fail due to bad SGML punctuation                      (Anonymous)
   #671873  minimal USB support (UHCI)                                  (Ben Lunt)
   #682539  Fix CapsLock and NumLock behavior                           (rock at gimp.org)
   #720776  REX MOVB immediate broken for x86_64                        (Arnd Bergmann)
   #729450  new keymap x11-pc-be.map                                    (Wouter Verhelst)
   #735990  Limited patches for VC++                                    (Anonymous)
   #742670  fix library dependencies in GUI plugins                     (Robert Millan)
   #742782  LFB bugfix                                                  (Jan L. Hauffa)
   #748414  load32bitOShack bug                                         (kyriazis at nvidia.com)
   #830079  Fix bochs's application error if unsupported key pressed    (Anonymous)
   #724466  enable building with CC=gcc-3.2 CXX=g++-3.2; dist-clean adds(Leonard Norrgard)
   #834962  Fixed drawing graphics is broken                            (Anonymous)
   #838401  Fixed redrawing of ToolBar on Win32GUI                      (Anonymous)
   #850236  Fixed accessing DVD-ROM with direct device access on Win32  (Anonymous)
   #847822  Bochs crash when exmining memory that crosses page boundary (ortal at jungo.com)
 
 - SF patches partially applied
   #707931  Support EGA/VGA write mode 2 and others                     (Anonymous)
            already applied: disable IME, split screen, write mode 2,
            BIOS INT16h/AH=05h
   #856506/#856510  Patch to fix compile-time iodev/cd-rom.cc error     (alden.dima at nist.gov)
            Correct patch provided in SF bug report #843433             (birkhofer at users.sourceforge.net)
 
 - patches applied
   - patch.highmem  (memory allocation) (Zwane Mwaikambo)
   - patch.floppy-160k-180k-320k-benlunt (exotic floppies) (Ben Lunt)
   - patch.perf-regparm-cclark (performance) (Conn Clark)
 
 - new patches present in the patches directory :
         patch.pipelined-asm-cclark
         patch.mingw-resources
         patch.v8086-exception.lightcone
         patch.pit-vitaly-vorobyov
         patch.rombios-vitaly-vorobyov
         patch.win32-vitaly-vorobyov
         patch.win32-new-files-vitaly-vorobyov.tgz
         patch.rombios.markevich
         patch.rombios.dirk.thierbach
 
 - these S.F. bugs were closed
    #865354 ">>PANIC<< CRA: divider chain control 0x07" in Linux 1.1
    #725796 configure script bug
    #859768 cpuid
    #863964 panic in duron 2000
    #843433 cdrom.cc on MacOSX: wrong const names
    #818493 EMU][ (DJGPP app running on FreeDOS) broken
    #787005 Some MOV instructions are not implemented!!!
    #840664 2200136693936p[CPU ] >>PANIC<< prefetch: RIP > CS.limit
    #837416 V2 OS not compatible !?
    #650917 Serial port broken under win95
    #829863 Make bochs 2.0.2 build with gcc3
    #816971 main.cc: getcwd() missing argument
    #813556 Compile error under gcc 3.3.1
    #809758 RIGHT ALT does not function properly
    #809695 CVS complains about unknown files after compilation
    #628762 Error in Floppy Booting
    #474526 Crash under win32 (access violation)
    #687619 test case for BX_CPU_C::IRET32
    #664544 Panic in IRET32 - Reporting test case
    #637822 test case for BX_CPU_C::IRET32
    #603410 BX_CP U_C::IRET32
    #537047 IRET32 incomplete emulation, panic
    #805541 Compile fails on i686, gcc 3.3
    #798829 Problem booting from ISO image
    #688163 Panic at rombios.c
    #688161 rombios.c crashes when boot from a CD.
    #796339 int 15h, e801h broken?
    #666946 Slowdown Timer should be a module
    #783826 the clock is extremely fast
    #645609 Real Time Clock is too *FAST*
    #663320 flaw in IO bitmap permission handling
    #764929 Timing is off.
    #659510 Bochs timing off by x10
    #787138 No ROM BIOS character map
    #787134 Config options not saved
    #689201 Disassembler bug
    #666202 Windows 2000 - random screen blanking with linux DLX demo
    #629242 reset during Doom -> BIOS panic
    #695434 minix floppies won't boot.
    #764473 Freesco Linux crashes on boot
    #656026 error when trying to run some stuff
    #614202 HD: non-byte IO read to 01f4
    #777357 Strange FPU compiler error
    #583758 gag bootloader doesn't run
    #658639 ne2k panics with MS lanman Client/DOS62
    #536711 problem running smart bootmanager
    #741433 Disabling all ata# results in HD error.
    #753200 lock instruction doesn't do an illegal instruction trap
    #679389 libbx_wx.so.0: undefined symbol
    #758936 Problem Installing Bochs
    #742580 I configured fants but bochs still give me the same error
    #772242 iodev/vga.cc wrong memory access.
    #739222 Cannot change resultion
    #693344 libwx_gtk2.3.so.2 RedHat linux 8.0
    #639320 sparc: needs -lm to compile
    #587422 Windows 95j doesn't boot
    #547817 sparc: rfb needs -lsocket
    #480963 RFB: option to wait for client
    #763893 i've got problems with a "libvga.so.1" and another file
    #766490 Documentation mistake
    #766481 Bochs 2.0.2 Fails to compile on YDL3.0
    #626144 %lld is not portable
    #752241 lock prefix erronously allowed for some instructions
    #743305 fetchdecode.c probs
    #658707 Automatic exit?
    #696758 BeOS can't mount image disk, won't complete boot.
    #737048 Enabling keyboard resets controllers translation mode
    #717713 Bochs panics on startup on RH 9
    #741108 VGA PANIC
    #730922 seg fault on "bochs boot: cdrom"
    #658905 VGA read write error
    #564218 Panic on vga_mem_write
    #614231 X11 doesn't support charmap change
    #708311 Missing CGA low-res emulation
    #720776 REX MOVB immediate broken for x86_64
    #643296 lock prefix, unallowed cases
    #716964 [sb16] OPL.timer_running not initialized
    #662074 little mistake in the default config example
    #470701 CD-ROM on Win2K needs FILE_SHARE_READ
    #706454 bug??
    #653861 Win32 build bug
    #421155 panic on vga read 0x3c7,0x3cb
    #666434 VGA BIOS: Incompatible mode reporting
    #681819 Incorrent return value from cdrom reads
    #648222 Lotus Agenda futuristic dates off
    #657455 doesn't boot plan9
    #658938 SGDT in VM8086

Emulating this? It could probably run under: QEMU