Commodore 1351 Benutzerhandbuch Seite 34

PROPORTIONAL
MOUSE
DEVELOPER'S GUIDE
This section explains the theory
of
operation
of
the
Commo-
dore
1351
mouse
and suggests
ways
in
which
it
can be
interfa-
ced
to
applications or software.
INTRODUCTION
The
Commodore
1351
mouse
for
use
with
the
C64/C128
pro-
duct
line
is
a
small
two-button device
which
is
connected
to
either of
the
joystick
ports
on
the
C64/C128.
The
mouse
supports
two
distinct
operating
modes:
1)
Joystick
mode.
2)
Proportional
mode.
Proportional
mode
is
usable
with the
C64
or
the C128,
and
re-
quires
a
special
machine
language
driver to yield
optimum
performance.
Mode
selection
is
determined
when
the
mouse
is
powered
up.
If
the user
depresses
the
right
mouse
button
when
the device
is
powered
up,
then the
mouse
will
be
in
joystick
mode.
If
the user
does
not
depress
the
right
mouse
button
when
the
device
is
powered
up,
then
the
mouse
will
default
to
proportio-
nal
mode.
Joystick
mode
allows
you
to
utilise
the
mouse
as a
joystick
when
using software
which does
not
support
proportional
mode.
JOYSTICK
MODE
In
joystick
mode
the
mouse
operates as
follows:
1
) If
the
mouse
is
moved,
then
the approriate joystick
lines
are
activated
for
a
period
of
20
ms.
Thus moving
the
mouse
is
like
pushing
the
joystick
in
the appropriate
direction.
30
English