How is it possible to increase the number of rows and columns in a console Session window ?
Changing the terminal under AP Session Definition does not change the number of rows and columns.
Release : 11.7
Check the CONSOLxx member in the SYS1.PARMLIB what UNIT is specified..
Possibly it says UNIT(3270-2) ...
Change it to UNIT(3270-X) and possibly then connect as model 2 and Model 4 screens sizes should be possible..
Depending on the Terminal specification of the Session in AP..
Also check the AREA and SEG parameters in the CONSOLxx member.. Possibly these need a change because of the sizing..
The actual issue is the SEG parameter...
SEG(19) is according IBM a Model 2 SEG setting..
See this IBM page:
https://www.ibm.com/docs/en/zos/2.3.0?topic=definition-maximum-default-specifications-area-seg
Changing this to SEG(39) will make a Model 4 terminal
Console AREA and SEG:
https://www.ibm.com/docs/en/zos/2.3.0?topic=definition-maximum-default-specifications-area-seg
Console UNIT parm:
https://www.ibm.com/docs/en/zos/2.3.0?topic=definition-devices-used-as-mcs-consoles#devmcs__chart
Console DEVNUM UNIT parm:
https://www.ibm.com/docs/en/zos/2.3.0?topic=consolxx-syntax-parameters-console-statement