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2)
The
left
mouse
button
is
mapped
to
what would be
the
fire
button
on a
joystick.
3)
The
right
mouse
button
is
mapped
into
the
SID
POTX
regi-
ster.
If
the button
is
depressed
then
the
SID
POTX
register
will
contain
a
number <$80.
If
the button
is
not
depressed
then
SID
POTX
will
contain
a
number
>=$80.
4)
See
the section
on SID
REGISTER
CAUTIONS.
Software
interface:
For
most
applications,
the
interface
for
joystick
mode
should
be
just
as
any
joystick
driver,
and
the
right
button
should
be
ignored.
PROPORTIONAL
MODE
In
proportional
mode
the
mouse
operates as
follows:
1)
Mouse movement
is
tracked
internally
within
the
mouse.
The
position of
the
mouse
MOD
64
is
transmitted
to
the
SID
POTX
and
POTY
registers
every 512 us
and
requires
no
soft-
ware
intervention.
The
POTX
register
is
used
to
read
the
X
position
of
the
mouse
and
the
POTY
register
is
used
to
read the
Y
position
of
the
mouse.
The
register
contents are as
follows:
Bit
Position
POT
Register
where:
X
is
a
don't
care
bit.
P5-P0
...
is
the
mouse
position
MOD
64.
N
is
a
special (noise)
bit
(keep
reading
.
.
.).
2)
The
left
mouse
button
is
mapped
to
what would be
the
fire
button
on a
joystick.
English
31
7
6
5
4
3 2
1
X
P5 P4 P3 P2
P1
PO
N
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