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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.
Asteroids (Atari, 1979)
Memory Area:asteroid_map
Address RangeLengthFunctionDescription
0x0000-0x01FF512RAM
0x0200-0x02FF256RAM Bank, Sharedram1, ram1
0x0300-0x03FF256RAM Bank, Sharedram2, ram2
0x2000-0x20078Readasteroid_IN0_r (/* IN0 */)
0x2400-0x24078Readasteroid_IN1_r (/* IN1 */)
0x2800-0x28034Readasteroid_DSW1_r (/* DSW1 */)
0x30001Device Writedvg, dvg_device, go_w
0x32001Writeasteroid_bank_switch_w
0x34001Device Writewatchdog, watchdog_timer_device, reset_w
0x36001Writeasteroid_explode_w
0x3A001Writeasteroid_thump_w
0x3C00-0x3C056Writeasteroid_sounds_w
0x3E001Writeasteroid_noise_reset_w
0x4000-0x47FF2048RAM, Shared, Regionvectorram, maincpu, 0x4000
0x5000-0x57FF2048ROM(/* vector rom */)
0x6800-0x7FFF6144ROM
 

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:maincpu
Address RangeLengthLabel/LocationDescription
0x5000-0x57FF2048035127-02.np3CRC(8b71fd9e) (Fluke: CBED)
0x5000-0x57FF2048035127-02.np3CRC(8b71fd9e) (Fluke: CBED)
0x6800-0x6FFF2048035145-04e.ef2CRC(b503eaf7) (Fluke: 3935)
0x7000-0x77FF2048035144-04e.h2CRC(25233192) (Fluke: BD6D)
0x7800-0x7FFF2048035143-02.j2CRC(312caa02) (Fluke: 232F)
0x7800-0x7FFF2048035143-02.j2CRC(312caa02) (Fluke: 232F)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256034602-01.c8CRC(97953db8) (Fluke: 1A8D)
0x0000-0x00FF256034602-01.c8CRC(97953db8) (Fluke: 1A8D)
0x0000-0x00FF256034602-01.c8CRC(97953db8) (Fluke: 1A8D)
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