Now that the hardware is configured, it's time to learn how to use it. Before we detail the use of the ROM manager, here are some informations about ROMs and the best way to use them.
The CPC firmware allows up to 252 expansion ROMs to be added to the system. This feature was present exen even in the CPC 464. It allowed the very clean integration of AMSDOS to manage floppy disks in a natural way from BASIC and assembler programs, without any change to their code.
The expansion ROMs are accessed the same way as the BASIC ROM. They are mapped in the C000-FFFF range and can be read by the z80. Writing in this area will always affect the RAM, either the central memory, or expansion RAM if present and enabled. In the default configuration, this area is used as video memory, and there is no need to read from it.