Display Data StreamChapter —6
290 TE 2000
5250 Terminal Emulation Programmer’s Guide
Control Portions of SF Order
Below describes the control portions of the SF order.
Hex Code Description
80XX Resequencing, “xx” defines the next field number
80FF Resequencing terminator
8101 Enable scanne r (extended 5250); this is IBM’s MSR option
8102 Reserved (extended 5250)
B1A0 Modulus 10 self-check
B140 Modulus 11 self-check
Attribute Portions of SF Order
Below describes the attribute portions of the SF order.
Hex Code Description
20 Normal (dark characte rs on light background)
21 Reverse image (light characters on dark background)
24 Underscore
28 Blink (applies only to the 6400, 59XX, and 17XX)
2F Nondisplay
30 Column separator
Results
The SF order does the following:
S The display address is set to the end-of-f ield address (as specified by the
last SF order + 1). This does not happen if this is the first SF orderorif
an SBA order precedes it (the SBA points at the field starting attribute).
S ThescreenattributeintheSF order is written into the location defined
by the display address.
S The start-of-field address is set to the display address +1.
S The end-of-field address is set to the display address + the field length
specified by the SF order. The ending screen attribute is written to the
end-of -field +1. This is a “20.”
S Thedisplayaddressisincrementedby1.
S If this is an input field (one in which a field format word has been speci-
fied), a format table entry consisting of the field f ormat and the FCWs
is generated. In addition, if the SF order is rejected, the keyboard is
locked and any outstanding AID byte is cleared.
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