13. Memory Map

ATOM mode Address BBC BASIC mode
RAM 0000 RAM (8K)
  2000 RAM (8K OPTIONAL)
  3C00  
  4000 GRAPHICS RAM (6K)
  5800  
  6000 UTILITY ROM (4K)
  7000 I/O
GRAPHICS RAM (6K) 8000 BBC BASIC (32K)
  9800
UTILITY ROM (4K) A000
I/O B000
ATOM ROM (4K) C000 MOS EXTENSION ROM (4K)
EXTENSION ROM (4K) D000 EXTENSION ROM (4K)
OPTIONAL DOS (4K) E000 OPTIONAL DOS (4K)
ATOM ROM (4K) F000 MOS ROM (4K)