Rom map: +----------+ 0000 | BIOS | +----------+ 0400 | BASIC | +----------+ 2400 Bios copies itself and basic to the top 16k which then look like: +----------+ c000 | INT VEC | +----------+ c050 | BIOS API | +----------+ | BIOS | +----------+ c400 | BIOS VAR | +----------+ c800 | BASIC | +----------+ e800 | BASIC WS | | .... | | BASIC ST | +----------+ ffff