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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.
Orbit (Atari, 1978)
Memory Area:orbit_map
Address RangeLengthFunctionDescription
0x0000-0x00FF256Mirror, RAM0x0700,
0x08001Mirror, Read Port0x07ff, P1
0x0001UnusedActive Low
0x0002Button 2Active Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 3Active Low
0x0020Button 1Active Low
0x0040TiltActive Low
0x0080Coin 2Active Low
0x10001Mirror, Read Port0x07ff, P2
0x0001UnusedActive Low
0x0002Button 2Active Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 3Active Low
0x0020Button 1Active Low
0x0080Coin 1Active Low
0x18001Mirror, Read Port0x07ff, DSW1
0x00000:30Active High
0x00011:00Active High
0x00021:30Active High
0x00032:00Active High
0x00042:30Active High
0x00053:00Active High
0x00063:30Active High
0x00074:00Active High
0x0018LanguageActive High
0x0000EnglishActive High
0x0008SpanishActive High
0x0010FrenchActive High
0x0018GermanActive High
0x0020Free_PlayActive High
0x0000OffActive High
0x0020OnActive High
0x20001Mirror, Read Port0x07ff, DSW2
0x0001Game ResetActive Low
0x0002Game 9Active Low
0x0004Game 8Active Low
0x0000OffActive High
0x0008OnActive High
0x0010Heat ResetActive Low
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080CustomActive High
0x28001Mirror, Read Port0x07ff, BUTTONS
0x0001Game 7 / Strong GravityActive Low
0x0002Game 6 / StarsActive Low
0x0004Game 5 / Unlimited SuppliesActive Low
0x0008Game 4 / Space StationsActive Low
0x0010Game 3 / Black HoleActive Low
0x0020Game 2 / Zero GravityActive Low
0x0040Game 1 / Negative GravityActive Low
0x0080Game 0 / Bounce BackActive Low
0x3000-0x33BF960Mirror, RAM Write, Shared0x0400, orbit_playfield_w, playfield_ram
0x33C0-0x33FF64Mirror, RAM, Shared0x0400, , sprite_ram
0x38001Mirror, Write0x00ff, orbit_note_w
0x39001Mirror, Write0x00ff, orbit_noise_amp_w
0x3A001Mirror, Write0x00ff, orbit_note_amp_w
0x3C00-0x3C0F16Mirror, Write0x00f0, orbit_misc_w
0x3E001Mirror, Write0x00ff, orbit_noise_rst_w
0x3F001Mirror, Device Write0x00ff, watchdog, watchdog_timer_device, reset_w
0x6000-0x7FFF8192ROM
 

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
0x0000-0x07FF2048033712.b7CRC(cfd43bf2) (Fluke: 54FB)
0x0800-0x0FFF2048033713.d7CRC(5ac89f4d) (Fluke: 54CC)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x01FF512033711.a7CRC(9987174a) (Fluke: 1852)
0x0000-0x00FF256033688.p6CRC(ee66ddba) (Fluke: D9E3)
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