=> R0 = 144
R1 = vertical screen shift (as a signed 8 bit number)
R2 = interlace flag, 0=on, 1=off
<= R0 preserved
R1 = previous vertical screen shift
R2 = previous interlace flag
This call specifies the vertical screen alignment and interlace options after the next mode change. This is equivalent to *TV.
See PRM 1, page 650
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