This option is provided so that you may select the appropriate 3270 model. This will be used to set the screen size and to provide terminal identification to the host machine where appropriate. You may need to select an extended type (one of those with an E extension) to enable use of extended attributes from the host. The base model number determines the alternate screen size the host may use, where
327x-1 is 16 rows of 80 columns 327x-2 is 24 rows of 80 columns 327x-3 is 32 rows of 80 columns 327x-4 is 43 rows of 80 columns 327x-5 is 27 rows of 132 columns 3287-1 is printer
If you select a printer type, you will probably also need to specify an LU name and select extended telnet mode in the host settings.