Keyword Conflicts And Compatibilities - IBM 5280 Programmer's Manual

Field Description Statement
Character Meaning
A Alphabetic shift - Any character can be entered. The shift is
positioned to the lower symbol on each key on all keyboards. The
operator can use the Shift key to enter the upper symbol on the
keys.
D Digits only - Only the digits 0 through 9 can be entered. The shift
is positioned to the lower symbols on typewriter keyboards and is
positioned to the upper symbols on both data entry keyboards and
proof keyboards. Negative numbers are displayed with the sign
over the last digit of the number. The operator cannot override the
shift.
H Hexadecimal- Each character position requires two keystrokes
and only the numbers 0 through 9 and the letters A through F can
be entered. No shift key operation is required on data-entry
keyboards.
N Numeric shift - Any character can be entered. The shift is
positioned to the lower symbols on typewriter keyboards and is
positioned to the upper symbols on both the data entry keyboards
and the proof keyboards. The operator can change the shift by
using the Alphabetic Shift key.
V Right half only - Only the characters that are defined at system
generation can be entered. The shift is positioned to the lower right
symbols on World Trade keyboards. The shift key allows entry of
the upper right symbols.
W Right half shift - Any character can be entered. The shift
positioned to the lower right symbols on the World Trade
keyboards. The operator can change the shift by using the shift
keys.
tINote: V and W should be used only for those keyboards with more
than two shift positions (such as the Katakana keyboard). Don't
use these data types in programs that are to be executed on other
keyboards or an unrecoverable error will occur at execution.
X Alphabetic only - Only the letters A through Z, comma, period,
hyphen, and space can be entered. The shift is positioned to the
lower symbols on all keyboards. The shift cannot be changed by
the operator.
Y Numeric only - Only the numbers 0 through 9, comma, period,
plus, minus, and space can be entered. The shift is positioned to
the lower symbols on typewriter keyboards and to the upper
symbols on both the data entry keyboards and the proof keyboards.
The shift cannot be changed by the operator.
Keyword Conflicts and Compatibilities
Some keywords for field description statements cannot be used in combination
with certain entries in the Usage field, certain entries in the Data Type field,
or certain other keywords and parameters. The valid and invalid
combinations are indicated in the following charts.
The Xs represent invalid combinations. For example, in figure 2.7 (Part 2),
CHECK(DR) cannot be used for output fields (coded with 0 in the Usage
field). Also notice that combining DR (data required) and BY (bypass) as
parameters for CHECK is invalid. Also, DR cannot be specified twice for the
same field.
Chapter 2. Transaction I/O - Screen Definition 2- 25