IBM System/360 System Programmer's Guide

r----------------------------------T-----------------------------------,
I I Density I
I Value ~-----------------T-----------------~
I I Model I Model I
I I
2400 I 2400 I
I I
7-track I 9-track I
~----------------------------------+-----------------+-----------------~
I 0 I 200 I I
I
1 I 556 I I
I
2 I 800 I 800 I
L __________________________________ ~ _________________ ~ _________________ J
If this parameter is omitted, the lowest density is assumed.
TRTCH=value
specifies, for 7-track magnetic tape, the tape recording technique
as follows:
Value, Tape Recording Technique
C Data conversion feature is available.
E
T
Even parity is used.
assumed. )
(If omitted, odd parity is
BCDIC to EBCDIC translation is required.
MODE=value
specifies, for a card reader or punch, the mode of operation.
Either C (column binary mode) or E (EBCDIC code) may be specified.
STACK=value
specifies, for a card punch or card reader, the stacker bin to
receive cards as either 1 or 2.
PRTSP=value
specifies, for a printer, the line spacing as either 0, 1, 2, or 3.
OPEN -- Initialize Data Control Block
The OPEN macro-instruction initializes one or more data
blocks so that their associated data sets can be processed.
issue OPEN for all data control blocks that are to be used
channel programs. Some of the procedures performed when
executed are:
control
You must
by your
OPEN is
• Construction of data extent block (DEB).
• Transfer of information from DD statements and data set labels to
data control block.
• Verification or creation of standard labels.
• Tape positioning.
• Loading of programmer-written appendage routines.
The three parameters of the OPEN macro-instruction are:
dcb-addr
90
specifies the address of the data control block to be initialized.
(More than one data control block may be specified.)
specifies the intended method of I/O processing of the data set.
You may specify this parameter as either INPUT, RDBACK, or OUTPUT.
For each of these, label processing when OPEN is executed is as
follows:

IBM System/360 Specifications

General

Brand	IBM
Model	System/360
Category	Desktop
Language	English