This
is
another example of a key coupling error. The keys
throughout
the
keyboard are coupied together in various combinations.
but
only give problems in
these certain combinations. Because of key coupling. the extra key
is
thrown
in
erroneously.
The third example shows a set of three adjacent keys
with
KeY1
in an even
column.
When
KeY1
is
positioned in
an
even column.
KeY2
is
passed by and never
put
into
the buffer for printing.
Example
3:
(
SF
The
bottom
row of the small keyboard
is
a special problem area for three-key
roi lover.
It
is
inconsistent in relation to the three-key roilover for the remaining
keyboard.
The simultaneous
hitting
of the three
following
keys:
produces only the reverse graphie representation of a fourth key:
The change from normal
to
graphie mode
might
be due
to
reverse coupling
of
the
SHIFT and
RVS
~eys.
--
172
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