=> R0 = 195 (&C3)
R1 = 0
R2 = 255
<= R0 = preserved
R1 = duration (video frames)
R2 corrupted
This call reads the duration of the first flash colour, as set with OS_Byte 9 or VDU 23,9. This call should not be used to write the value - doing so would only change the value in memory, without affecting the hardware.
See PRM 1, page 660
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