This is the Commander X16 ROM containing BASIC, KERNAL, DOS and GEOS. BASIC and KERNAL are derived from the Commodore 64 versions. GEOS is derived from the C64/C128 version. * BASIC is fully compatible with Commodore BASIC V2. * KERNAL: -> supports the complete $FF81+ API. -> has the same zero page and $0200-$033C memory layout as the C64. -> does not support tape (device 1). * GEOS is fully compatible with the C64 version.