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OTHER SYSTEM FUNCTIONS
27.4 -- Diskette Fil@ Functions
o
'Cont~olle~
er~or
status :
1
Address of
Tunction call
2
l
to sector
I/O
function
In
addition,
the
.MDERR
function will pick up the logical
unit
numbe~
and the physical sector
numbe~
Trom the
diskette
controller
va~iables
in
locations
$0000-$00021
inclusive.
When the error message
is
displayed,
the parameter
"hO
~ill
have
been replaced with the address of the call to the error
message function,
the parameter
"i"
will have
been
replaced
usith the
logic~l
unit numberJ and
the
parameter
IfJII
will have
been replaced with the physical sector number
at
which
the
el''1'or occurred.
ENTRY PARAMETERS:
EXIT CONDITIONS:
B
=
The index number of the e'1'ror message
as shoUln in the above tables.
X
may. not have to
be
parameterized.
IT
the
er'1'or
message
calls
for
an
external parameter, X will
have
to
contain
the
pa~ameter
or the address
of the parameter that is to be placed
into the error message.
The contents
of
X depend on the
type
or
message
displayed
as
shoUln
in
the
above
tab
1
es.
A is indeterminate.
B
is indeterminate.
X is indeterminate.
C
=
O.
The
remainder
of
CC
is
i
nd
etermi na te.
The
Error Type or the system
e~ror
status
word has been changed to contain
the
index
number
of the displayed err-or
message.
In
addition;
the
Er~or
Status
Flag
of
the
system
error
status
~ord
has
been
set
to
one.
Section
28.4
contains
a
complete
description
o~
the
system
error
status
~ord.
I~
the
. MDERR
function is called with an index number
POl'"
~hich
nd valid error message exists, or
l~ ~ne
MDOS error
message
file
cannot
be accessed on the diskette without an
Page
27-34
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