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Xerox 900 series User Manual

Xerox 900 series
105 pages
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METHOD:
(cont
.)
62
unconditional
read
operation
of
the
current
sector
into
the
specified
file's
I/O
buffer.
No
information
is
transferred
to
the
user.
Close
Calling
sequence:
BRM
02
*QSYS
FDT
Close
the
file
whose
number
is
specified
in
the
fourth word
of
the
file
descrip-
ti on
tabl
e.
Words
two
and
three
are
ignored.
II
CI
ose"
corresponds
to
an
un-
conditional
write
operation
upon
the
current
sector
from
the
specified
file's
I/O
buffer.
Since
a
"write"
call
does
not
always
result
in
an
I/O
operation,
"close"
is used
to
ensure
that
the
file's
output
buffer
is
"dumped"
onto
the
RAD.
Read
Call
ing
sequence:
BRM
03
*QSYS
FDT
Read from
the
file
whose
number
is
specified
in
the
fourth word
of
the
file
de-
scription
table.
Word
three
specifies
the
number
of
words
to
be
read,
and
word
two
specifies
the
area
into
which
the
information
is
to
be
transferred.
The
speci-
fied
file
must
be
open;
i.e.,
an
"open"
operation
must
precede
the
first
"read"
operation.
Variable
length
records
may
be
read
under
"count
control
II
by
specifying
their
length
to
be
unknown
((word
three)
<0).
The
file
management
routine
will
then
assume
the
record
length
to
be
specified
in
bits
3-8
of
the
first word in
the
record.
Write
Calling
sequence:
BRM
04
*QSYS
FDT
Write
onto
the
file
whose
number
is
specified
in
the
fourth word
of
the
file
de-
scription
table.
Word
three
specifies
the
number
of
words
to
be
written,
and
word
two
specifies
the
area
from
which
the
information
is
to
be
transferred.
The
specified
file
must
be
open;
i.
e.,
an
"open"
operation
must
precede
the
fi rst "wri
te
II
op~rati
on.
Before
returning
to
the
calling
program,
the
file
management
routine
clears
the
contents
of
the
next
word in
the
output
buffer;
however,
the
next
write
will
"overwrite"
the
"clear".
That
is,
it
is
as
though
every
write
were
followed
by
a
write
end-of-file
and
a
backspace.
This
feature
is used by
the
processors
and
loader
to
identify
the
end
of
the
Xl,
X2,
and
BO
files,
whose
records
could
not
otherwise
contain
zero
in
the
first word.

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Xerox 900 series Specifications

General IconGeneral
BrandXerox
Model900 series
CategoryCopier
LanguageEnglish

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