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ERROR MESSAGES
E6
E7
E8
E9
28.1 -- Diskette Controller Errors
The
diskette
controller
has
been
presented
with
a
cylinder-sector
address
that
is
invalid.
This error
occurs when the
sum
of
STRSCT
and
NUMSCT
(see
Appendix
D)
is larger
than the total number of
sectors
on
the diskette.
This
error
indicates some
t~pe
of a
hardware
problem.
For
example,
the
error
can
be
caused
b~
missing or
overlapping memory,
bad
memory,
or
pending IRGs that cannot be serviced.
A
seek error occurred while trying to
read
the
resident
operating
system
into memory.
Like
Eb
errors,
this one indicates
some type of a hardware problem.
A
data mark error was detected
while
tr~ing
to read the resident operating
system into memory.
A eRC error was faund
while
reading
the
address
mark
that
identifies
•
secto~
locations on
th~
diskette.
The diskette
controller
errors
EL
E4,
E8,
and
E9
indicate
that
the
diskette
cann~t
be
used
to
load the
operating system;
however, a
new
operating
system
can
be
generated
on
that
diskette,
making
it useful again.
The
DOSGEN (Chapter
10)
and/or
FORMAT
(Chapter
15)
commands
should be consulted ror generating
a
new diskette.
Depending
on the extent of the errors,
the
diskette
may
be
used
in
drive one to
re~over
any files that may be en
it
(see section
2. 8. 9>'
The diskette controller error
E5
can occur for
a
variety
of
reasons.
The most common reason, and the most fatal,
is
the
destruction
of
the
addressing
information
on
the
diskette.
If
the addreSSing information has been destroyed
(verified by using the DUMP command to examine areas
of
the
diskette),
the
FORMAT
command
may
be used to rewrite the
addressing;
however,
information
on
the
damaged
diskette
cannot
be
recovered.
Occasionally, after a system has Just
been unpacked,
the read/write head may have
been
pOSitioned
past
its
normal
restore
point
on cylinder zero.
In this
ease,
trying the event which caused the error three
or
more
times
may
position
the
head to the proper place.
If
this
fails,
the head will have to be
manually
repositioned
past
cylinder
zero;
however,
this problem rarely
OCCUl'S.
The
E5
errors can also
...... , . " . I ......
1.1"-'-1.11
if
a
user-un'
i
tten
prog1"am
ac.cesses
Page
28-03
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