Well its bit of challenge for Jerome to teach me how to do a Mainframe on a PI with serial terminal. I started the project using a old HPE 700/96 terminal amber. I used this site as my prime info.
https://www.cyberciti.biz/hardware/5-linux-unix-commands-for-connecting-to-the-serial-console/
dmesg | egrep --color 'serial|ttyS'
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