VDU 23,16,x,y,0,0,0,0,0,0
This VDU controls the movement of the cursor after printing. The value of the control byte is altered by
new value = (old value AND y) EOR x
The bits in the value are interpreted as follows
bit effect when set
7 undefined (normal is unset)
6 in VDU 5 mode cursor movement beyond the window edge does not generate newlines
5 cursor does not move after characters are printed (normal action is to move in positive X direction)
4 cursor movement in Y direction out of window results in cursor being "wrapped round" to opposite side (normal action in VDU 4 mode is to scroll, VDU 5 to wrap)
3 X direction is vertical, Y is horizontal (normal is Y vertical)
2 Positive vertical direction is down (normal is up)
1 Positive horizontal direction is right (normal is left)
0 scroll protection enabled (normal is disabled, but desktop sets bit 0 and enables scroll protection)
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