VDU 23,0,action,mode,0,0,0,0,0,0
Set the interlace and control cursor appearance.
Action = 8 Set interlace:
Mode : 0 Set it to opposite of current *TV
1 Set it to current *TV
&80 Turn interlace off
&81 Turn interlace on
Action = 10 Set start line for cursor:
Mode : b0-4 Start line (0 is top)
b5-6 00 Steady
01 Off
02 Fast flash
03 Slow flash
Action = 11 End line for cursor = Mode
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