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Commodore Plus 4
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6
Using
Peripheral
Devices
The
Plus/4
is
compatible
with
the
1541
disk
drive
and
Commodore's
printers
available
for
the
Commodore
64
and
VIC
20,
such
as
the
MPS-801
and
1526.
A
new
Direct
Memory
Access
(DMA)
fast
disk
drive
has
been
promised,
but
as
of
this
writing,
it
is
not
available.
The
Plus/4
is
NOT
compatible
with
the
DATASSETTE
cassette
player
used
with
the
earlier
computers
(the
C2N/1530)
but
rather
can
use
a
new
Commodore
DATASSETTE,
the
1531.
The
Plus/
4
has
a
new
RS232
output
that
is
not
completely
compatible
with
the
64.
Therefore,
you
cannot
use
the
VIC
modem
or
automodems
sold
for
the
64
and
VIC
20.
The
Plus/4
is
compatible
with
the
model
1660
MODEM/300.
The
Plus/4
also
uses
a
new
j
oystick,
the
T-1341.
The
Disk
Drive
The
disk
drive
is
a
hardware
device
that
is
controlled
by
software
known
as
the
Disk
Operating
System
(DOS).
Commodore
disk
drives
generally
have
the
DOS
in
the
disk
drive
rather
than
in
the
computer.
Hence,
the
drives
are
referred
to
as
"intelligent."
The
1541
has
its
own
built-in
6502
microprocessor,
a
DOS
ROM,
and
some
RAM.
Programs
running
in
the
computer
send
commands
to
the
DOS
through
the
serial
bus.
The
BASIC
section
of
this
chapter
covers
the
commands
recognized
by
the
DOS.
This
information
will
be
useful
for
machine-language
programmers
as
well.
Most
often
the
data
and
programs
stored
on
a
diskette
are
organized
into
files.
The
only
exception
is
when
direct-access
programming
is
used
to
put
information
on
the
diskette.
Each
file
is
identified
with a
file
name
that
is
assigned
to
it
when
it
is
created.
The
file
name
of
each
file
on
the
same
diskette
must
be
unique.
Occasionally
(where
noted
below),
it
is
useful to
refer
to
a
file
(or
group
of
files)
by
using
a
"wild
card"
in
the
file
name
position
of
a
command.
The
Plus/
4
supports
two
such
wild
cards.
One
is
the
asterisk,
which
when
used
in
a
file
name
means
that
any
characters
appearing
at
and
after
the
position
of
the
asterisk
match.
For
example,
the
use
of
"F*"
as
a
file
name
matches
all
file
names
on
the
diskette
that
323

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