IBM 5100 - Maintenance Information Manual; Maintenance; Diagnostic Aids; Theory

Scroll Left 8
In a scroll operation, pressing the scroll left key moves all lines on the display
screen
to the left if there isan arrow in position 64 of the status line. The lines
continue
to move to the left if this key is held down.
Scroll Right 8
In a scroll operation, pressing the scroll right key moves all lines on the display
screen
to the right if position 1 of the extended display is not in position 1 on the
display screen. The lines continue to move to the right if this key is held down.
Operation of Keys 13