=> R0 = 176 (&B0)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = value before being overwritten
R2 corrupted
This call reads or sets the "50Hz" counter, a 1 byte counter which is decreased every vSync. As a consequence the rate of this counter is actually mode and monitor dependent, and should not be used for accurate timing.
See PRM 1, page 405
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