BIOS com port

[DSMan195276]

The com port addresses for Com1: to Com4:

Unfortunately you have multiple problems here, the com port address would be useless for you as real in/out port access is not supported in QB64. A small number of the ports are emulated to allow old programs to work but that's it (COM ports aren't included in that).

As others have mentioned the BIOS memory is also emulated for some sections, and simply empty for the rest.

Ideally the solution here would be to rewrite the program to use the `OPEN` syntax for COM ports. That still works as it will go through Windows to talk to the port.