warning: `DB` directive without data in ROM [-Wempty-data-directive]
    at empty-data-directive.asm(6)
warning: `DW` directive without data in ROM [-Wempty-data-directive]
    at empty-data-directive.asm(7)
warning: `DL` directive without data in ROM [-Wempty-data-directive]
    at empty-data-directive.asm(8)
