Kuhnke KDT 633, Instruction Manual

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Command sequences
Tabulation
Hex 09h
Decimal 9
ASCII
HT
This command moves the cursor right to the next horizontal
position which can be divided by 8. The cursor does not move
if it is at or behind the last such position in a line already.
Cursor up
Hex 0Bh
Decimal 11
ASCII
VT
The cursor moves one line up unless it is in the topmost line of
the writing area already. In this case it stays at its current posi-
tion. This is also applicable if the cursor is in the topmost line
of the writing area.
Cursor down with scroll
Hex 0Ah
Decimal 10
ASCII
LT
The cursor moves one line down unless it is in the bottom line
of the writing area already. If the cursor is in the last line of the
scroll area, this command causes a scroll-up by one line.