This mode works on all machines, except IBM VM.
Note that one may create a true exchange-format file with sequential WRITE on some machine, and read it with direct-access on this or another machine.
Open the file and initialize FZ:
OPEN (Lun, FILE='zname', STATUS='OLD', FORM='UNFORMATTED' +, ACCESS='DIRECT', RECL=3600) CALL FZFILE (Lun, 900, 'D')
Key-word READONLY
should be given on CONVEX, VAX, DECstation.
Open the file and initialize FZ:
OPEN (Lun, FILE='zname', STATUS='NEW', FORM='UNFORMATTED' +, ACCESS='DIRECT', RECL=3600) CALL FZFILE (Lun, 900, 'DO')
On most machines the record-length is given in bytes.
On VAX and DECstation one must specify words: RECL=900