Commodore PET User Manual page 191

Two-key repetition is a feature of any PET keyboard. small or full size.
For simplicity. only the compact keyboard is shown below. Keys available for
KeY1 will differ. depending on which keyboard vou have.
As with roi lover. the keyboard is divided into odd and even columns.
with only the odd column keys availabl.e for KeY1. However. the entire right-
hand numeric board and cursor controls are available for KeY1. regardless of odd
and even columns.
Keys available as KeY1 (shaded)
--.
Any key in the even columns used for KeY1 will not produce a repeating
sequence. Another peculiarity is that the cursor keys must be used as KeY1 in
either programmed or immediate mode.
KeY1
~I
"'___.
cuf.o.,
(iN5Tî!
::::>~
Further limiting this feature is the requirement that KeY2 be to the right of
KeY1 in the same row. or below the row of KeY1. If KeY2 is located above KeY1 or
to the left. the process stops after the first printing of KeY1'
A useful application to demonstrate two-key repetition is creating graphie
diagrams with cursor movements. For example. draw the diagonal line shown in
the diagram below.
*"
*"
:+:
:+:
:+:
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