Connecting Terminals › Screen Sizes

Screen Sizes

Some terminals and controllers support a special screen size definition in the logmode table definition called unspecified viewport size. When unspecified viewport size is specified, the screen size is determined from the parameters received from the terminal in a query.

If unspecified viewport size is not specified, the default or alternate screen size for the terminal type determines the screen size for the terminal connection. The default for all terminal types is 24 rows by 80 columns. The alternate screen size is the largest screen size of which a terminal type is capable.

To enable unspecified viewport size, specify X‘03’ in the 11th position of the PSERVIC field of the logmode table definition.

Notes:

• The session parameters are not altered to specify unspecified viewport size unless the definition also supports a query of extended attributes.
• The screen size for non-SNA terminals is always set using the information obtained by the query, regardless of the screen size information in the BIND.
• If an unspecified viewport size BIND is sent to a terminal that does not support it, the BIND fails.
• The following devices support an unspecified viewport size BIND:
  • 3174 controller
  • 3274 controller at Configuration Support D, Release level 65
  • Most distributed function devices