VDU 23,7,extent,direction,movement,0,0,0,0,0
This VDU scrolls the current text window or whole screen:
extent effect
0 scroll text window
1 scroll whole screen
movement effect
0 scroll by one character cell
1 scroll by one character cell vertically, one byte horizontally
VDU 23,7 1 byte horizontal motion
Number of colours Pixels moved
2 8
4 4
16 2
256 1
VDU 23,7 directions
value scroll direction
0 right
1 left
2 down
3 up
4 positive X direction
5 negative X direction
6 positive Y direction
7 negative Y direction
X and Y directions are controlled with VDU 23,16.
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