Vertical Mark Card Format - IBM System/370 145 Manual

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Figure 20.30.3. Vertical mark caz:'d format
OMR mode and format are establi.shed in the same manner as they are
for read column eliminate. The ne~w WRITE OMR FORMAT command must be
issued to establish OMR format rea.ding mode-and to indicate which
columns are to be read in OMR mode~. FEED, READ only, and READ AND FEED
commands must have the format mode~ bit on in the operation code to cause
optical mark reading to be effecti.ve. OMR and read column eliminate
cannot be used simultaneously (because they use the same format hardware
and command mode bit).
Vertical mark fields can be read in EBCDIC or column binary mode, and
validity checking is performed on EBCDIC data as usual. A vertical mark
field transferred to storage does not contain the interspersed blank
columns contained in the card. The control unit compresses vertical
mark fields into contiguous data fields by sending only vertical mark
columns to storage. Thus, a three-character vertical mark field in card
columns 1 to 6 appears in positions 1 to 3 of the input area in storage.
When a vertical mark column is read, the control unit distinguishes
between a marginal mark and a valid mark. A marginal mark indication
can result from a poor erasure, a short mark, or a poor marking device.
If a vertical mark column cannot be read properly, a hexadecimal '3F' in
EBCDIC mode, or '3F3F', in column binary mode, is placed in the input
area in that column position. (Hexadecimal
I,
3F' corresponds to a 7, 8,
and 9 punch in a card column. This character should- not be used for any
other purpose on cards to be read in OMR mode.) Column 80 (or 160) will
also contain a hexadecimal '3F' when a marginal mark is sensed in any
column. An error indication is not given, so that the user program can
scan vertical mark fields for '3F- characters (if column 80 or 160
contains a '3F" and take the recovery action desired. If the Selective
stacker feature is installed, vertical mark cards with read errors can
be selected into stacker 2, unless card sequence must be maintained.
A vertical mark field must not ,contain any punches or nonreflective
marks in addition to the actual ve_rtical mark data. Thus, if a card is
designed to have the characters of a vertical mark field handprinted as
A Guide to the IBM System/370 Model 145 133