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From: Roy Tam <roytam@gmail.com>
Date: Sat, 13 Mar 2010 00:13:04 +0800
Message-ID: <473191351003120813kf694d93s102f0ad22684b733@mail.gmail.com>
Subject: Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?)
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To: Kevin O'Connor <kevin@koconnor.net>
Cc: seabios@seabios.org, qemu-devel <qemu-devel@nongnu.org>

2010/3/12 Kevin O'Connor <kevin@koconnor.net>:
> On Thu, Mar 11, 2010 at 03:42:28PM +0800, Roy Tam wrote:
>> Sorry I can't find documentation on this usage. But instead I have
>> lots of old programs written with this usage.
>> Using undocumented features from BIOS/DOS is very usual in that time.
>
> Can you confirm these other programs fail in the same way (no keyboard
> input, and "ps2 irq but no data." messages in log when using
> bios.bin-0.5.1-debug-20100228)?
>
>> > It's broken because it causes key presses to be lost and corrupted.
>> > The ps2 port hardware just doesn't work the way that software is
>> > trying to use it.
>> >
>>
>> You said that "it causes key presses to be lost and corrupted" but I
>> haven't heard any complain about this.
>> Real BIOSes (Award BIOS, AMI BIOS, Phoenix BIOS) handle this usage
>> very well and no key press are lost or corrupted.
>
> Under qemu-0.11 normal typing lead to lots of keyboard errors for me.
> It's possible real hardware would be less susceptible to this error,
> but there is nothing that a BIOS inside qemu can do to stop the
> corruption.
>

and Norton GHOST for DOS (all versions, 8.0/8.2/8.3/11.5 tested) are
affected too.
for me having corrupted/incomplete scancodes is far better than having null.