IBM System/370 145 Manual page 161

• Data Set Utilities - a set of four ASCII utilities that includes
printing, punching, and comparison of ASCII-mode tapes in addition
to translation to and from ASCII mode
• TSO Data Utilities
ASCII-mode tapes are also supported by data management (QSAM and
BSAM) so they can be processed by user-written Assembler Language
programs.
The 3803/3420 Magnetic Tape ~ubsystem. This tape subsystem is
supported as an I/O device for thE! same functions as 2400-series tape
units. This includes support of t:ape switching, Seven Track, and Dual
Density features. ,(Note that 200--BPI density tapes are not supported
because the Seven Track feature includes only 556- and 800-BPI
densities.) The Two-Channel Swit(:h is supported for alternate path
switching between two channels in the same system.
The 3410/3411 Magnetic Tape Subsystem. Support of this tape
subsystem functionally identical t:o that provided for 2400-series tape
units is provided.
The 3505 Card Reader. This reader is supported by QSAM and BSAM for
the-saIDe basic input functions as are provided for the 2540 and 2501
readers, including support as a SYSIN device. Features are supported by
the access methods as follows:
• Stacker selection into stackeI:s 1 and 2 is provided, as for current
readers. If a stacker select request for stacker 3 is received, the
3505 will place the card i:n st:acker 2 without giving any indication
of this action to the user program. If a request for stacker 2 is
received and the optional SelE~ctive Stacker feature is not
installed, the 3505 will
dire(~
the card to stacker
1
without any
indication to the program.
• Card Image support is identical to that provided for other card
readers. Either EBCDIC or column binary read mode is established at
OPEN, depending on the user specification, and this mode remains in
effect until the data set is closed or end of file occurs on the
reader. Thus input decks that~ contain cards with EBCDIC and column
binary punching in the same ceRrd, or a mixtQ,re of cards punched in
one mode or the other, must bE~ handled by the user with the EXCP
macro.
• OMR and RCE are supported but not concurrently for the same data
set. These options are reques:ted via the DCB MODE parameter, either
in the program DCB or in the DO statement DCB parameter. The format
to be used is supplied by the user in the first card of the input
deck. Once the data set is opened and the format has been
established, the format remains in effect until the data set is
closed. A data set to be readl in OMR or RCE format mode cannot be
placed in the input stream (illl the SYSIN device). It must be read
directly from the 3505 by the user program. A program that is to
use one of these features must~ specifically request allocation of a
3505 with the feature instaIIE!d, via the UNIT parameter, as the
scheduler will not allocate a 3505 by feature.
The OS high-level languages (COBOL, PL/I, FORTRAN, and RPG) also
support the 3505, including OMR alld RCE. Support for these new features
can be requested in job control
st~atements
and is, therefore,
transparent to the high-level langruages. The Card Image and Stacker
Select features of the 3505 are supported by these languages to the same
degree as they are for other reade!rs. Any OS utility that uses
QSAM or BSAM also supports the 3505 and its features. ASP and HASP II
support the 3505 for the same functions they provide for other card
readers.
A Guide to the IBM System/310 Mode!l 145
151