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If
possible
remove
the disk
from
the
drive
during
I/O
and
reinsert
another
disk that
is
different.
Different
density
Has bad
sectors
Has
different
number
of
sides
Do
I/O
on
disks
of
various formats
including:
Double
&
Single density
Double
&
Single sided
Different
number
of
tracks
per
sector
Different
physical flaws
Different
physical
drive location
Different
file
count
Device
I/O
COM
This
is
a Read/Write
device.
By
configuring the port with
Telcom
it
is
possible
to
hook
a
device
to
any
external
COM
port
thet
the
computer
may
have
attached
and use
it
as an
output device
for
applications
to print
to.
Note
that certain signals
may
have
to
be
applied
to
the
port
for
data
to
pass
through
it.
PRN
This
is
a
Write only device,
Try
printing to
PRN
with
and
without
a
printer
connected.
CON
This
is
a
Read/Write
device.
a.
Read comes
from
the
keyboard.
b.
Write
goes
to
the screen.
Print to
CON
using various
applications.
Check
that
the screen
is
redrawn
after printing.
Try
Merging from
CON
with
Word
or
Loading from
CON
with
BASIC.
188
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