Mouse Input: Difference between revisions
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which is which. To tell if there is any available data on port 0x60 at all, it is necessary
to read a byte from port 0x64. In that byte from port 0x64, bit number 0 (value=1) indicates that a byte is
available to be read on port 0x60. An additional bit, bit number 5 (value=0x20 or 0b00100000), indicates that this next byte
came from the mouse, if the bit is set. If you look at [[RBIL]], it says that this "mouse bit" is MCA specific,
but this is no longer true. All PCs that support PS2 mice use this bit to indicate that the incoming byte was
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