I am almost certain that my Quartus II web 13.1 program creates RTL schematics with errors in them. (I have not upgraded the installation afterwards because my computer is offline!).

Hi KhaiY, I haven't any other questions at the moment and haven't tried yet to write the BRAM simulator vhdl code you suggested me to add to the in Quartus II failing compilation. I am just starting to write my first simulation code if I find time and when I exactly know how to do that. Been busy with other things in electronics I know more about. Also still waiting on another book on VHDL. But Covid-19 has put shipment at a halt for the last 3 months and it seems that it isn't coming soon either from Bookvistas in India and ordered through Amazon.de. Thanks KhaiY, Best regards and thanks for you trying me to understand how some things in Quartus work. But without online connection the Quartus Help database is sadly greatly missed and should be integrated in the program for offline access. Have a great week! Albert.