2023-11-14 06:41 PM
2023-11-14 07:44 PM
It was a model with some Java software on-board, as I recall
https://www.st.com/en/evaluation-tools/stm3240g-java.html
2023-11-15 10:05 AM
The suffix J also stands or stood for a customised version, to whose documents only the client has access.
Regards,
/Peter