Atari System 1 Video Microprocessor Memory Map ------------------------------- adr r/w d15 ---------- d0 Program ROM 000000-087fff r/w dddddddd dddddddd Program RAM 400000-401fff dddddddd dddddddd Playfield Horizontal Scroll 800000 w d dddddddd Playfield Vertical Scroll 820000 w d dddddddd Playfield Special Priority Color 840000 r dddddddd Sound Processor Reset 860000 w d Trak-Ball Test w d Motion Object Parameter Buffer Select w d d Playfield ROM Bank Select w d Trak-Ball Resolution and Test LED w d Alphanumerics ROM Bank Select w d Watchdog 880000 w Vertical Blank IRQ Acknowledge 8a0000 w Unlock 8c0000 w Cartridge External 900000-9fffff r/w dddddddd dddddddd Playfield RAM a00000-a01fff r/w dddddddd dddddddd Motion Object Vertical Position a02000-a0207f r/w dddddddd dddddddd Motion Object Picture a02080-a020ff r/w dddddddd dddddddd Motion Object Horizontal Position a02100-a0217f r/w dddddddd dddddddd Motion Object Link a02180-a021ff r/w dddddddd dddddddd Motion Object Vertical Position a02200-a0227f r/w dddddddd dddddddd Motion Object Picture a02280-a022ff r/w dddddddd dddddddd Motion Object Horizontal Postion a02300-a023ff r/w dddddddd dddddddd Motion Object Link a02380-a023ff r/w dddddddd dddddddd Motion Object Vertical Postion a02e00-a02e7f r/w dddddddd dddddddd Motion Object Picture a02e80-a02eff r/w dddddddd dddddddd Motion Object Horizontal Position a02f00-a02f7f r/w dddddddd dddddddd Motion Object Link a02f80-a02fff r/w dddddddd dddddddd Alphanumerics RAM a03000-a03fff r/w dddddddd dddddddd Alphanumerics Color RAM b00000-b001ff r/w dddddddd dddddddd Motion Object Color RAM b00200-b003ff r/w dddddddd dddddddd Playfield Color RAM b00400-b005ff r/w dddddddd dddddddd Translucent Color RAM b00600-b0061f r/w dddddddd dddddddd EEPROM f00000-f00fff r dddddddd Trak-Ball f20000-f20006 r dddddddd Analog Joystick f40000-f4000e r dddddddd Analog Joystick IRQ Disable f40010 r Output Buffer Full (@ FE0000) f60000 r d Self-Test r d Switch Input r d Vertical Blank r d Switch Input r d Switch Input r d Switch Input r d Switch Input r d Read Sound Processor (6502) fc0000 r dddddddd Write Sound Processor (6502) fe0000 w dddddddd I/O and Sound Microprocessor Memory Map --------------------------------------- adr a15 ------------ a0 r/w d7 -- d0 Program RAM 0000-0fff 0000 aaaa aaaa aaaa r/w dddddddd Cartridge External 1000-1fff 0001 aaaa aaaa aaaa r/w dddddddd Music 1800-1801 0001 1000 0000 000a r/w dddddddd Read 68000 Port 1810 0001 1000 0001 0000 r dddddddd Write 68000 Port 1810 0001 1000 0001 0000 w dddddddd Self-Test 1820 0001 1000 0010 0000 r d Buffer Output full (@ 1810) d Data Available (@ 1810) d Auxiliary Coin Switch d Left Coin Switch d Right Coin Switch d Music Reset 1820 0001 1000 0010 0000 w d Light-Emitting Diode 1824 0001 1000 0010 0100 w d Light-Emitting Diode 1825 0001 1000 0010 0101 w d Right Coin Counter 1826 0001 1000 0010 0110 w d Left Coin Counter 1827 0001 1000 0010 0111 w d Sound Effects 1870-187f 0001 1000 0111 aaaa r/w dddddddd Program ROM 4000-ffff aaaa aaaa aaaa aaaa r dddddddd