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Latest release: Bochs 3.1
Details on what has changed since version 3.0
Bochs 3.1 is a major release. Here is the brief summary of changes :
- CPU: Implemented FRED, USER_MSR, MOVRS, AMX-FP8 ISA extensions emulation
- CPU: Implemented MS-DOS Compatibility mode for handling x87 FPU exceptions, external logic handles FERR# and IGNNE# pins if enabled.
- CPUDB: Added new Wildcat Lake CPU definition featuring FRED, WRMSRNS and MSRLIST
- Bugfixes for CPU emulation correctness (critical bugfixes for emulation of XSAVEC/XSAVES, PKeys, AVX BMI1/BMI2, AVX512, AMX, UINTR, CET and SVM)
- Increased maximum supported host memory size to 8192 MB (was 2048 MB)
- Added UEFI/OVMF firmware support to Bochs through QEMU-compatible fw_cfg device.
- This enables booting UEFI operating systems including Windows Server 2025 and modern Linux distributions with OVMF firmware.
- Added basic support for GeForce 3D card emulation (4 AGP models, 2D almost complete, 3D still WIP)
- AGP support in i440BX chipset now almost correctly implemented
- Many fixes in the devices code (PCI, VGA, Voodoo, hard drive, floppy, USB)
- VHDX disk image support added
- BIOS fixes for PCI/AGP init and ACPI tables
- LGPL'd VGABIOS updated to version 0.9d
- Updated SeaBIOS ROM image to current version 1.16.0
The binary packages for Linux and Windows are built with these features :
- x86-64 emulation with all optimizations enabled
- devices:
- chipset: PCI (i430FX / i440FX / i440BX), ACPI
- video: Bochs VBE, Cirrus SVGA, 4 Voodoo and Geforce models
- sound: SB16 (ISA) and ES1370 (PCI)
- network: NE2000 (ISA/PCI) and E1000 (PCI)
- USB: OHCI, UHCI, EHCI, xHCI and 8 pluggable device types
- other: game port, bus mouse
- Display libraries:
- Linux: nogui, rfb, sdl2, term, vncsrv, x
- Windows: nogui, rfb, win32
Previous release: Bochs 3.0
Bochs 3.0 is a major release. Here is the brief summary of changes :
- Include Bochs debugger support in all release binaries. Bochs internal debugger and Bochs GUI debugger are compiled in by default and there are no special Bochs binaries with internal debugger support anymore.
- Integrated softfloat3e library replacing older softfloat2a fpu-emulation code
- Bugfixes for CPU emulation correctness (critical bugfixes for VMX, WAITPKG, LASS, XSAVEC/XSAVES, CPUID and SHA1 ISA implementation)
- Added emulation of missing AMD 3DNow! instructions
- Implemented AVX512_FP16 Intel instruction set based on softfloat3e library (enabled in Xeon Sapphire Rapids CPU definition)
- Implemented MONITORLESS MWAIT instructions support
- Implemented initial support for AVX10_1 + AVX10_2 ISA extensions and AVX10 CPUID leaf 0x24 (AVX10_1 first to be enabled in Xeon Granite Rapids)
- Implemented AMX-TF32 and AMX-AVX512 ISA extensions
- Implemented RAO-INT ISA and MSR_IMM ISA extensions
- CPUID: Added new CPU definitions: for i386, i486DX4, AMD Athlon XP and Intel Core i5 Arrow Lake CPUs
- CPUID: Support for enabling/disabling of one or more CPU features from CPUID configuration (see "add_features" and "exclude_features" in bochsrc sample and documentation)
- ! CPUID: Old bx_generic CPUID model is deprecated with all associated .bochsrc CPUID configuration options, use pre-defined CPU models instead
- Several fixes and improvements for the Cirrus and Voodoo emulation
- USB: Added the USB Debugger support for xHCI and UHCI (Windows / GTK3)
- Added USB boot option (requires i440fx.bin BIOS)
- LGPL'd VGABIOS updated to version 0.9c (Cirrus / VBE fixes and extensions)
- Added i440fx.bin BIOS written by Ben Lunt (https://github.com/fysnet/i440fx)
- Documentation updates and fixes after transition to GIT
Details on what has changed since version 2.8
Bochs Binary and Source Releases
The latest release of Bochs is available in these file formats :
- Win64 binary NSIS installer package (EXE)
- Linux binary RPM (64 bit)
- Platform independant source package (TAR.GZ)
- Win32 specific source package prepared for VS2019 (ZIP)
- Linux source RPM
You can download any release since March 2001 on the
Files Page on SF.
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