mirror of
https://github.com/xemu-project/xemu.git
synced 2025-02-26 07:27:39 +00:00
37e7b86766
When in CGA modes, QEMU wants to ignore the maximum scan field (bits 0..4) of the maximum scan length register in the CRTC. It is not clear why this is needed---for example, Bochs ignores bit 7 instead. The issue is that the CGA modes are not detected correctly, and in particular mode 6 results in multi_scan==3 according to how SeaBIOS programs it. The right way to check for CGA graphics modes is to check whether bit 13 of the address is special cased by the CRT controller to achieve line interleaving, i.e. whether bit 0 of the CRTC mode control register is clear. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1020 Reported-by: Korneliusz Osmenda <korneliuszo@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>