Il 05/03/2013 18:22, David Woodhouse ha scritto: > On Tue, 2013-03-05 at 16:04 +0100, Paolo Bonzini wrote: >> > Do not do a hard reset for port 92h, keyboard controller, or cf9h soft >> > reset. These only reset the CPU. > Is a keyboard reset also supposed to reset the A20 gate?
Resetting with 0xFE is not supposed to reset the A20 gate. Resetting with 0xD1 will set the A20 gate to whatever value you place in the data byte. (Also, resetting with 0xD1 for what I could find does not have the same edge-triggered behavior as port 92). Paolo
