If you run this schematics on FPGA, RAM change !
==== Second schematic RAM+VGA ====
With JavaCPC, when you do a snapshoot, and hex edit result file, you see that RAM content starting at a certain address.
Do "paper 2", "cls" on JavaCPC, the screen became RED, and then save a snapshoot, you can see that last part (from 0xC000 to 0xFFFF) had change from a lot of 0x00 into a lot of 0xFF