=> R0 = 193 (&C1)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = value before being overwritten
R2 corrupted
This call reads or sets the count-down timer for flashing colours. Provided that the flash period is not infinite, the counter is loaded with the duration of the first flash colour and counts down by one every VSync until it reaches zero. At this point the colours are swapped and the counter loaded with the second flash period. etc.
See PRM 1, page 657
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