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Xerox 900 series - Page 64

Xerox 900 series
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CALLING
SEQUENCE:
(cont
.)
METHOD:
loc
FDT
+1
+2
+3
o
2
3
4
I
ER
lEOF
IEOS I
5 6
9
10
23
I
FP
I
Core
Origin
Block
Size
Logical
File
No.
In
the
event
of
an
error,
the
cause
of
error
is
identified
by QFMR in
FDT
as
follows:
Error I. D.
Cause
Operati
on was
attempted
but
was unsuccessfu I.
ER
= 1
FP
= 1
EOS = 1
A
write
operation
was
attempted
into
a
file-protected
area.
Not
possible
to
satisfy
requested
write
operation.
No
further
disc
storage
available.
EOF=l
End-of-file
encountered
on a
read
operation
(self-delimiting
files
only).
The
core
origin
is
the
beginning
core
location
to/from
which
the
user
requests
an
I/O
operation
to
be
performed.
The
block
size
is
set
by
the
user
to
specify
the
number
of
words
that
are
to
be
transferred.
When
the
user
is
reading
from a
fi
Ie whose
records
are
sel
f-
delimiting,
it
should
be
so
indicated
by
setting
the
block
size
negative
(self-
delimiting
files
contain
a word
count
in
bits
3-8
of
the
first word
of
every
record).
The
logical
file
number is
set
by
the
user
to
specify
the
file
by
number.
O:S
1 : Xl
2 : X2
3 : BO/BI
4:D
QFMR is
one
of
two
routines
which
comprise
the
MONARCH
RAD
I/O
package:
RDISC/WDISC Disc
Handler
59

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