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Idiomas disponibles
SID
REGISTER CAUTIONS:
In
the
C64 &
C128,
the
SID
pot
lines
are
connected
to
both
joy-
stick ports.
A
4066
analog
switch
is
used
to
switch the
POT
lines
between
the
two
ports
based on one
of
the
keyboard scan
lines.
The
means
that
the
normal keyscan
interrupt
temporarily
affects
the
values
returned
in
the
POT
registers.
Therefore,
in
order
to
perform
reliable
conversions, the
POT
lines
must be
connected
to
the
mouse
for
a
period
>
1.6
ms
before the value
returned
in
the
POT
register
is
valid.
The
best
way
to
insure
this
is
to
wedge
the
mouse
driver
soft-
ware
into
the
IRQ
handler
prior to
the polled
keyscan. This
more-or-less assures
that
the
keyscan
lines
have been
suffi-
ciently
stable before the
POT
register
is
read
by
the
mouse
drivers.
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