Because of the size and type of keys used
for
the small
PET
keyboard, vou
may encounter
minor
data entry problems if
Vou
try to type fast on the small
keyboard. These problem areas are described in detail below. If vou
have a full
size
PET
keyboard. vou
might
proceed to the next section,
"The
Keyboard Buffer."
Two-Key
Rollover (Small Keyboard)
There are areas
on
the
compact
PET
keyboard
which
do not give predictable
results during rollover. The space key on the
bottom
row
(a
SPACE
character
is
in-
dicated hereafter by the symbol
"11f')
is
coupied
with
the keys directly to the left
and right. giving incorrect results.
cou
pied
~
B~mrn
lYJ~BJ
When
the
RIGHT
BRACKET
[j]key
and the
SPACE
key to its left are pressed
simultaneously:
correct roi
lover should print:
]
t6
but
the
PET
often prints:
]<16
or
]
16
<16
The key coupling erroneously puts
the"
<"
character (to the
right
of the
"115"
key)
and sometimes and extra
"115"
into
the buffer. The same problem occurs
when
the
keys are reversed:
Instead of printing:
]
t6
the
PET
often prints:
<16]
or
16
t6
<]
The
above
examples show
that
rollover should not be depended upon
when typing
on
the bottom
row
of the small keyboard due
to
the coupling
problem
with
the
SPACE
key.
But the rest
of
the small PET keyboard can be
depended upon for
two-key
rollover
as
a valuable safeguard against losing
keystrokes.
169
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