Apple IIe - Page 192

192
Apple
lie
Users
Handbook
For
example,
the
following
DOS
command:
CAT
ALOG,S4,D2
would
acces
the
second
drive
installed
on
the
controller
card
installed
in
slot
4.
The
default
slot
number
will
initially
be
the
slot
from
which
DOS
was
booted
.
Regardless
of
the
slot
used
to
boot
DOS, DOS
must
always
be
booted
from
drive
1
rather
than
drive
2.
If
a
slot
parameter
is
subsequently
executed,
the
specified
slot
will
be
the
new
default.
When
using
the
slot
parameter
with
DOS
commands,
be
certain
that
the
specified
slot
contains a disk
controller
card. The
follow-
ing
error
will
appear
if
the
specified
slot
does
not
contain
a disk
controller
card.
1/0
ERROR
DOS
will
then
suppose
that
the
specified
drive
(which
is
in
fact
not
connected
to
the
system)
is
still
running
. DOS
will
wait
for
this
non-existent
controller
and
drive
to
signal
that
it
has
stopped
running.
In
other
words,
DOS
will
be
locked
up
even
if
the
correct
slot
is
specified.
If
you
do
not
care
to
save
the
program
in
memory
, recovery
from
this
error
condition
can
be
attained
by
simply
pressing Reset.
If
you
wish
to
save
the
program
in
RAM
,
you
can
do
so
by
resetting
the
default
slot
parameter
to
the
correct
slot
number.
You can
do
so by
entering:
CATALOG,
Sx
where
x
is
a
valid slot
number.
Volume
Specification
A
volume
number
can
be
assigned
to
a
diskette
when
it
is
initialized.
The
volume
number
is
specified
during
initialization