[vbox-dev] Problem in 8042
confused at theanykey.de
Sat Sep 13 10:02:23 PDT 2008
8042 hardware implementations provide the value at data port 0x60 after
read for a small time, so if the port is read again within that time,
the read value will be the same. The 8042 emulation provided by
VirtualBox clears that value too fast, seems to be cleared immediately
after read. Chained 8042 interrupt handlers (keyboard 1, mouse 12) may
read different values within one interrupt shot resulting in problems
especially with extended keys and handling key releases. Chained 8042
handlers are commonly used by DOS applications for handling special keys
and providing hot keys. Having both PS/2 mouse and keyboard may also
result in handling mouse data in the keyboard interrupt. The problem
could be solved by providing the value at the data port unless receiving
EOI if interrupts are enabled.
At moment many DOS applications doesn't work correctly.
Please let me know if you want to know something more.
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