Boot ROM

The WonderSwan boot ROM is where the console begins execution on power on.

• On the "mono" model, it occupies an area from $FF000 to $FFFFF, for a total of 4 KiB.
• On the Color model, it occupies an area from $FE000 to $FFFFF, for a total of 8 KiB.

It performs the following activities:

• checks if the cartridge self-test passed;
• checks if the cartridge footer is valid;
• if START is held when the console is turned on, enters the boot ROM menu;
• updates telemetry/diagnostics information in the internal EEPROM;
• displays the splash screen (optionally, a custom splash screen on Color models);
• jumps to the cartridge.