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DOSBox-X Git (2026/05/31) is an updated version of DOSBox, which emulates an Intel x86 PC to run old MS-DOS games on modern systems. Key changes in the latest update include the removal of unnecessary padding in FSTENV that caused Windows XP to misidentify the emulator as AMD, and a new protocol for managing FPU state during multitasking, which resolves glitches in Windows 3.1/95/98/ME. This fix currently applies only to the normal core, and plans are underway for implementing it in the dynamic core. DOSBox-X continues to support a broad range of legacy applications.
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DOSBox-X Build (2026/05/31) is now available for download. DOSBox-x is a variant of DOSBox. This software emulates an Intel x86 PC, complete with support for sound, graphics, mouse, joystick, modem, and more, which are essential for running numerous classic MS-DOS games that cannot operate on modern PCs and operating systems like Microsoft Windows XP, Windows Vista, Linux, and FreeBSD.
DOSBox-X Update Log:
* Eliminate unnecessary padding writing from FSTENV, as it serves no purpose and inadvertently leads Windows XP to believe we’re emulating an AMD processor
* FPU: Prior to executing ANY FPU instructions, validate CR0 for EM and TS bits and raise exception 7 if they are set. This is essential for Windows 3.1/95/98/ME to appropriately manage FPU state during task switches. Without this correction, multitasking, even between kernel drivers and games, can result in sporadic FPU state corruption and glitches. This adjustment applies only to the normal core; I need to determine how to implement it in the dynamic core as well
* FSTENV: Insert filler bytes for fields that are not yet implemented
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