Commodore 128 Programmer's Reference Manual page 332

322 COMMODORE 128
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HORIZONTAL SCROLLING
Horizontal scrolling is more complex than vertical scrolling. First, the Display RAM
memory must be set up to match the ''virtual" screen size. If the "virtual" screen is
132 characters wide, then the Display RAM memory must be organized as if 132
characters were to be displayed, even if only 80 horizontal characters will be displayed