Check a specific bit in a byte

[Kurdistan]

I have a byte which represents 8 different settings/modes which are enabled.
00000001b = A20 Enabled
00000011b = PM Enabled

I could cmp the byte with 1 to know if A20 is enabled.
I could cmp the byte with 3 if both A20 and PM is enabled.

What if i want to check if only PM is enabled?
So my question is, how can I cmp a single chosen bit in a byte?

Thanks

[Keith Kanios]

You can use TEST to achieve what you want.

[Kurdistan]

Nice, thanks. Also found BT which worked great too. (BT increase the output file with one extra byte compared to TEST).