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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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