=> R0 = 10
R1 = new duration (in video frames, or 0 for 'forever')
<= R0 preserved
R1 = previous duration
R2 corrupted
This call sets the duration of the second flash colour. A duration of 0 means display the second colour constantly. The current duration may be read with OS_Byte 194, and may also be set with VDU 23,10.
See PRM 1, page 630
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