AppendIX
C: TrOlbleshooflng
I/O
lIondslOf
irpJt/oulpuf
Input
relars to In/ormat,on coming
Into
the computer
(from
!ho
kay-
boord,
for
example) Output
refe's to ,nlorma'ion
traveling out
ollhe
computer
(10
(]
dsk drive
Of
pr,n'O!.
for
example)
124
Two
common
error messages
You
see
the
message:
SYNTAX
EJUlOR.
Some
progr2fnS require
lhoU
all your entries
be
in
uppercase
lettcrs.
Did
you
Iype in lowercase? Perhaps
thc
program
doesn't
recognize
the
command
or
instruction you typed. Did you misspell a
command
or
an
instruction?
To
put
everything in
capiul
lellers, press
Caps
Lock
down
and
type
your
entry
again Check
your
typing, If
you
made
a mistake, retype
the
command.
If that
doesn't
do
it, check the
manual
Docs
the
command
exist?
Do
you have its synt2x
(the
form
of
the
command)
correct
J
Vou
see
the
message
I/O
ERJIOR
This
can
happen
with all
periphcnl
devices,
not
JUSt
external disk
drives. Check
to
nuke
sure
the
de\'ice involved is SCOJrely
conneaed
into
the
computer
Also
check
the
section
on
error
messages in the
device
manual.
An
I/O
ERROR
message
means
there is a
problem
with
the
exchange
of
information
belween
the
computer
and
one
of
its periphct:ll
devices, You can usually guess what the problem is
based
on
whal
you
were trying to
do
when
the message appeared. If you're trying
10
print something,
the
problem
is
probably
the
connection
between
the
computer
and
the
printer, If
you're
uying
to
load
something
from
or
save
something
to
a disk, the
problem
is with
the
disk drive
If
an
external disk drivc is
the
problem,
consider
these possibilities
• Did you
put
an
unforJlUlted disk in
the
disk drive?
• Did you
put
the
wrong
disk
In
the dfi\'e?
• If you're using a S.2S-inch disk, is the disk
centered
within its
jacket?
• Could the disk
be
dJmage(]J
see
·Verify That a Disk
15
Readablc'
in thc Sys/em U/iltlte5
book
If
none
of
these solutions fixes
the
problem,
see
your
authorized
Applc dcalcr. Thc devicc
may
need
adjustment
or
repair.
I
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