IBM 3164 ASCII Manual page 93

Chapter 5. Programming considerations
Attribute
Field
Character
Line
5-6
The following table shows the handling of attributes in the inbound data
stream.
Read All Read/Send
Formatted Unformatted Formatted
I
Unformatted
Supported Not applicable Only MDT on or Not applicable
unprotected field
Supported Supported
Supported Supported
Not supported Supported
Not supported
Supported
Notes:
1. All attributes are effective in the outbound data stream.
2. In the case of the read all operation, all data is sent to the host.
I n an unformatted page, line attributes (except S HSW) are sent to the host at
the beginning of each line data and the following apply:
• For double-height lines (DHSW or DHOW), the two lines which occupy
the double-height characters in the buffer/viewport are sent as one line in
the inbound data stream.
• For double-width lines (SHOW or DHOW), characters on the right hand
side not visible in the page are not sent to the host as part of line data
except transmission by the Read All command.
In a formatted page the following apply:
• Line attributes are not included in the inbound data stream since only the
host program can write the line attributes and since the line attributes
cannot be moved by scrolling.
• The field data transmitted to the host depends on the field data
transmission mode.
Field data in modified field data transmission mode looks like this:
Field Characters
The (Extended) Set Buffer Address (X) SBA response specifies the buffer
address of the first character in the modified field. If the row or column
address is greater than 95, the XSBA format is used instead of SBA. The
field characters are generated from the field according to the
data-conversion rule. If the field has only null characters and the Null
Suppress option is on, no field characters are sent.
Field data in unprotected field data transmission mode looks like this:
I
SFA
I
Field Characters
The Set Field Attribute (SFA) response specifies the field attribute. The
field characters are generated from the field according to the
data-conversion rule. If the field has only null characters and the Null
Suppress option is on, no field characters are sent. All CA's are also sent.
(