Screen sizes

IMF/3000

Screen size is specified either by the IBM host or in the configuration file on the HP 3000. After Pass Thru is started, the screen size is assumed to be whatever was configured in the IMF/3000 configuration file.

SNA IMF

Like IMF/3000, SNA IMF allows the host to set the screen size. However, screen size cannot be specified on the HP 3000. As part of SNA protocol, the IBM host sends a BIND command at the beginning of a session. The BIND command, which is transparent to the user, establishes the screen size for SNA IMF. A screen must be 480, 1920, or 3440 characters; otherwise, SNA IMF rejects it.