The commit fixes the issue in master branch: https://git.qemu.org/?p=qemu.git;a=commit;h=de15df5ead400b7c3d0cf21c8164a7686dc81933
The fix is going to be released in 5.1 ** Changed in: qemu Status: In Progress => Fix Committed -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1840719 Title: win98se floppy fails to boot with isapc machine Status in QEMU: Fix Committed Bug description: QEMU emulator version 4.1.50 (commit 50d69ee0d) floppy image from: https://winworldpc.com/download/417d71c2-ae18-c39a-11c3-a4e284a2c3a5 $ qemu-system-i386 -M isapc -fda Windows\ 98\ Second\ Edition\ Boot.img SeaBIOS (version rel-1.12.1-0...) Booting from Floppy... Boot failed: could not read the boot disk To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1840719/+subscriptions