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Memory Map

The following is a memory map that was generated based on the MAME source code (.180).  This information is only as accurate as the MAME driver is.  If you see any errors, please let me know what that error is.
 
The Memory Area is related to where the information is from (CPU, Sound Board, etc..), and it may also reflect what it has in common with other hardware.
Blasteroids (Atari Games, 1987)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144Mirror, ROM0x000000,
0x800000-0x8000012Mirror, Device Write0x0381fe, watchdog, watchdog_timer_device, reset16_w
0x800200-0x8002012Mirror, Write0x0381fe, scanline_int_ack_w
0x800400-0x8004012Mirror, Write0x0381fe, video_int_ack_w
0x800600-0x8006012Mirror, Device Write0x0381fe, eeprom, atari_eeprom_device, unlock_write
0x800800-0x8009FF512Mirror, Write Only, Shared0x038000, , priorityram
0x800A00-0x800A012Mirror, Device Write 8-bit0x0381fe, jsa, atari_jsa_i_device, main_command_w, 0x00ff
0x800C00-0x800C012Mirror, Device Write0x0381fe, jsa, atari_jsa_i_device, sound_reset_w
0x800E00-0x800E012Mirror, Write0x0381fe, blstroid_halt_until_hblank_0_w
0x801400-0x8014012Mirror, Device Read 8-bit0x0383fe, jsa, atari_jsa_i_device, main_response_r, 0x00ff
0x801800-0x8018012Mirror, Read Port0x0383f8, DIAL0
0x00ffDialActive High
0xff00UnusedActive Low
0x801804-0x8018052Mirror, Read Port0x0383f8, DIAL1
0x00ffDialActive High
0xff00UnusedActive Low
0x801C00-0x801C012Mirror, Read Port0x0383fc, IN0
0x0001Button 1Active Low
0x0002Button 2Active Low
0x0004Button 3Active Low
0x0008Button 4Active Low
0x0010CustomActive High
0x0020CustomActive High
0x0040CustomActive Low
0xff00UnusedActive Low
0x801C02-0x801C032Mirror, Read Port0x0383fc, IN1
0x0001Button 1Active Low
0x0002Button 2Active Low
0x0004Button 3Active Low
0x0008Button 4Active Low
0x0010CustomActive High
0x0020CustomActive High
0x0040CustomActive Low
0x0080UnusedActive Low
0xff00UnusedActive Low
0x802000-0x8023FF1024Mirror, RAM Device Write, Shared0x038c00, palette, palette_device, write, palette
0x803000-0x8033FF1024Mirror, Device Read/Write 8-bit0x038c00, eeprom, atari_eeprom_device, read, write, 0x00ff
0x804000-0x804FFF4096Mirror, RAM Device Write, Shared0x038000, playfield, tilemap_device, write, playfield
0x805000-0x805FFF4096Mirror, RAM, Shared0x038000, , mob
0x806000-0x807FFF8192Mirror, RAM0x038000,
 

ROM Map for this game

 
This is the ROM map for the game.  This should tell you what address the ROM is at, how big it is, what it's used for.   
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536136057-1101.1lCRC(3c2daa5b) (Fluke: 7F62)
0x0000-0xFFFF65536136057-1101.1lCRC(3c2daa5b) (Fluke: 7F62)
0x0000-0xFFFF65536136057-1101.1lCRC(3c2daa5b) (Fluke: 7F62)
0x0000-0xFFFF65536136057-1101.1lCRC(3c2daa5b) (Fluke: 7F62)
0x0000-0xFFFF65536136057-1101.1lCRC(3c2daa5b) (Fluke: 7F62)
0x10000-0x1FFFF65536136057-1102.1mCRC(f84f0b97) (Fluke: 8101)
0x10000-0x1FFFF65536136057-1102.1mCRC(f84f0b97) (Fluke: 8101)
0x10000-0x1FFFF65536136057-1102.1mCRC(f84f0b97) (Fluke: 8101)
0x10000-0x1FFFF65536136057-1102.1mCRC(f84f0b97) (Fluke: 8101)
0x10000-0x1FFFF65536136057-1102.1mCRC(f84f0b97) (Fluke: 8101)
0x20000-0x2FFFF65536136057-1103.3lCRC(ae5274f0) (Fluke: BF68)
0x20000-0x2FFFF65536136057-1103.3lCRC(ae5274f0) (Fluke: BF68)
0x20000-0x2FFFF65536136057-1103.3lCRC(ae5274f0) (Fluke: BF68)
0x20000-0x2FFFF65536136057-1103.3lCRC(ae5274f0) (Fluke: BF68)
0x20000-0x2FFFF65536136057-1103.3lCRC(ae5274f0) (Fluke: BF68)
0x30000-0x3FFFF65536136057-1104.3mCRC(4bb72060) (Fluke: 6849)
0x30000-0x3FFFF65536136057-1104.3mCRC(4bb72060) (Fluke: 6849)
0x30000-0x3FFFF65536136057-1104.3mCRC(4bb72060) (Fluke: 6849)
0x30000-0x3FFFF65536136057-1104.3mCRC(4bb72060) (Fluke: 6849)
0x30000-0x3FFFF65536136057-1104.3mCRC(4bb72060) (Fluke: 6849)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536136057-1105.5mCRC(50e0823f) (Fluke: 6227)
0x0000-0xFFFF65536136057-1105.5mCRC(50e0823f) (Fluke: 6227)
0x0000-0xFFFF65536136057-1105.5mCRC(50e0823f) (Fluke: 6227)
0x0000-0xFFFF65536136057-1105.5mCRC(50e0823f) (Fluke: 6227)
0x0000-0xFFFF65536136057-1105.5mCRC(50e0823f) (Fluke: 6227)
0x10000-0x1FFFF65536136057-1107.67mCRC(729de7a9) (Fluke: 6B57)
0x10000-0x1FFFF65536136057-1107.67mCRC(729de7a9) (Fluke: 6B57)
0x10000-0x1FFFF65536136057-1107.67mCRC(729de7a9) (Fluke: 6B57)
0x10000-0x1FFFF65536136057-1107.67mCRC(729de7a9) (Fluke: 6B57)
0x10000-0x1FFFF65536136057-1107.67mCRC(729de7a9) (Fluke: 6B57)
0x20000-0x2FFFF65536136057-1109.8mCRC(090e42ab) (Fluke: 1F29)
0x20000-0x2FFFF65536136057-1109.8mCRC(090e42ab) (Fluke: 1F29)
0x20000-0x2FFFF65536136057-1109.8mCRC(090e42ab) (Fluke: 1F29)
0x20000-0x2FFFF65536136057-1109.8mCRC(090e42ab) (Fluke: 1F29)
0x20000-0x2FFFF65536136057-1109.8mCRC(090e42ab) (Fluke: 1F29)
0x30000-0x3FFFF65536136057-1111.10mCRC(1ff79e67) (Fluke: 231C)
0x30000-0x3FFFF65536136057-1111.10mCRC(1ff79e67) (Fluke: 231C)
0x30000-0x3FFFF65536136057-1111.10mCRC(1ff79e67) (Fluke: 231C)
0x30000-0x3FFFF65536136057-1111.10mCRC(1ff79e67) (Fluke: 231C)
0x30000-0x3FFFF65536136057-1111.10mCRC(1ff79e67) (Fluke: 231C)
0x40000-0x4FFFF65536136057-1113.11mCRC(4be1d504) (Fluke: 968F)
0x40000-0x4FFFF65536136057-1113.11mCRC(4be1d504) (Fluke: 968F)
0x40000-0x4FFFF65536136057-1113.11mCRC(4be1d504) (Fluke: 968F)
0x40000-0x4FFFF65536136057-1113.11mCRC(4be1d504) (Fluke: 968F)
0x50000-0x5FFFF65536136057-1115.13mCRC(e4409310) (Fluke: 5A76)
0x50000-0x5FFFF65536136057-1115.13mCRC(e4409310) (Fluke: 5A76)
0x50000-0x5FFFF65536136057-1115.13mCRC(e4409310) (Fluke: 5A76)
0x50000-0x5FFFF65536136057-1115.13mCRC(e4409310) (Fluke: 5A76)
0x50000-0x5FFFF65536136057-1115.13mCRC(e4409310) (Fluke: 5A76)
0x60000-0x6FFFF65536136057-1117.14mCRC(7aaca15e) (Fluke: 2180)
0x60000-0x6FFFF65536136057-1117.14mCRC(7aaca15e) (Fluke: 2180)
0x60000-0x6FFFF65536136057-1117.14mCRC(7aaca15e) (Fluke: 2180)
0x60000-0x6FFFF65536136057-1117.14mCRC(7aaca15e) (Fluke: 2180)
0x60000-0x6FFFF65536136057-1117.14mCRC(7aaca15e) (Fluke: 2180)
0x70000-0x7FFFF65536136057-1119.16mCRC(33690379) (Fluke: 973C)
0x70000-0x7FFFF65536136057-1119.16mCRC(33690379) (Fluke: 973C)
0x70000-0x7FFFF65536136057-1119.16mCRC(33690379) (Fluke: 973C)
0x70000-0x7FFFF65536136057-1119.16mCRC(33690379) (Fluke: 973C)
0x80000-0x8FFFF65536136057-1106.5nCRC(2720ee71) (Fluke: C3F9)
0x80000-0x8FFFF65536136057-1106.5nCRC(2720ee71) (Fluke: C3F9)
0x80000-0x8FFFF65536136057-1106.5nCRC(2720ee71) (Fluke: C3F9)
0x80000-0x8FFFF65536136057-1106.5nCRC(2720ee71) (Fluke: C3F9)
0x80000-0x8FFFF65536136057-1106.5nCRC(2720ee71) (Fluke: C3F9)
0x90000-0x9FFFF65536136057-1108.67nCRC(2faecd15) (Fluke: F1A5)
0x90000-0x9FFFF65536136057-1108.67nCRC(2faecd15) (Fluke: F1A5)
0x90000-0x9FFFF65536136057-1108.67nCRC(2faecd15) (Fluke: F1A5)
0x90000-0x9FFFF65536136057-1108.67nCRC(2faecd15) (Fluke: F1A5)
0x90000-0x9FFFF65536136057-1108.67nCRC(2faecd15) (Fluke: F1A5)
0xA0000-0xAFFFF65536136057-1110.8nCRC(a15e79e1) (Fluke: 81DE)
0xA0000-0xAFFFF65536136057-1110.8nCRC(a15e79e1) (Fluke: 81DE)
0xA0000-0xAFFFF65536136057-1110.8nCRC(a15e79e1) (Fluke: 81DE)
0xA0000-0xAFFFF65536136057-1110.8nCRC(a15e79e1) (Fluke: 81DE)
0xB0000-0xBFFFF65536136057-1112.10nCRC(4d5fc284) (Fluke: 9325)
0xB0000-0xBFFFF65536136057-1112.10nCRC(4d5fc284) (Fluke: 9325)
0xB0000-0xBFFFF65536136057-1112.10nCRC(4d5fc284) (Fluke: 9325)
0xB0000-0xBFFFF65536136057-1112.10nCRC(4d5fc284) (Fluke: 9325)
0xB0000-0xBFFFF65536136057-1112.10nCRC(4d5fc284) (Fluke: 9325)
0xC0000-0xCFFFF65536136057-1114.11nCRC(a70fc6e6) (Fluke: B2BD)
0xC0000-0xCFFFF65536136057-1114.11nCRC(a70fc6e6) (Fluke: B2BD)
0xC0000-0xCFFFF65536136057-1114.11nCRC(a70fc6e6) (Fluke: B2BD)
0xC0000-0xCFFFF65536136057-1114.11nCRC(a70fc6e6) (Fluke: B2BD)
0xD0000-0xDFFFF65536136057-1116.13nCRC(f423b4f8) (Fluke: 3100)
0xD0000-0xDFFFF65536136057-1116.13nCRC(f423b4f8) (Fluke: 3100)
0xD0000-0xDFFFF65536136057-1116.13nCRC(f423b4f8) (Fluke: 3100)
0xD0000-0xDFFFF65536136057-1116.13nCRC(f423b4f8) (Fluke: 3100)
0xD0000-0xDFFFF65536136057-1116.13nCRC(f423b4f8) (Fluke: 3100)
0xE0000-0xEFFFF65536136057-1118.14nCRC(56fa3d16) (Fluke: 4A27)
0xE0000-0xEFFFF65536136057-1118.14nCRC(56fa3d16) (Fluke: 4A27)
0xE0000-0xEFFFF65536136057-1118.14nCRC(56fa3d16) (Fluke: 4A27)
0xE0000-0xEFFFF65536136057-1118.14nCRC(56fa3d16) (Fluke: 4A27)
0xE0000-0xEFFFF65536136057-1118.14nCRC(56fa3d16) (Fluke: 4A27)
0xF0000-0xFFFFF65536136057-1120.16nCRC(f257f738) (Fluke: C03A)
0xF0000-0xFFFFF65536136057-1120.16nCRC(f257f738) (Fluke: C03A)
0xF0000-0xFFFFF65536136057-1120.16nCRC(f257f738) (Fluke: C03A)
0xF0000-0xFFFFF65536136057-1120.16nCRC(f257f738) (Fluke: C03A)
Memory Area:jsa:cpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536136057-1135.2kCRC(baa8b5fe) (Fluke: 5577)
0x0000-0xFFFF65536136057-1135.2kCRC(baa8b5fe) (Fluke: 5577)
0x0000-0xFFFF65536136057-1135.2kCRC(baa8b5fe) (Fluke: 5577)
0x0000-0xFFFF65536136057-1135.2kCRC(baa8b5fe) (Fluke: 5577)
0x0000-0xFFFF65536136057-1135.2kCRC(baa8b5fe) (Fluke: 5577)
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