
There is disagreement on whether LSR.THRE should be resampled when IER.THRI goes from 1 to 1. Bochs only does it if IER.THRI goes from 0 to 1; PCE does it even if IER.THRI is unchanged. But the Windows driver seems to always go from 1 to 0 and back to 1, so do things in agreement with Bochs, because the handling of thr_ipending was reported in 2010 (https://lists.gnu.org/archive/html/qemu-devel/2010-03/msg01914.html) as breaking DR-DOS Plus. Reported-by: Roy Tam <roytam@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team
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