A20 Gate

[Peter]

Hey people,

I'm Dutch so try to answer simple.
My question is about the A20 gate. If you read port 0x64 and test it on bit 1 you will test if the keyboard-controller is ready. But what are you testing if you doing it on bit 2?

Thanks

[new_world]

If bit 2 isn't clear then the output buffer isn't empty. You must wait till bit 2 is clear, then the command is sent.
For A20 you must wait some time that A20 is *really* enabled.

[Peter]

Thanks new_world