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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.
Ozon I (Proma, 1983)
Memory Area:galaxold_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM
0x5000-0x53FF1024RAM Write, Sharedgalaxold_videoram_w, videoram
0x5400-0x57FF1024Readgalaxold_videoram_r
0x5800-0x583F64RAM Write, Sharedgalaxold_attributesram_w, attributesram
0x5840-0x585F32RAM, Sharedspriteram
0x5860-0x587F32RAM, Sharedbulletsram
0x5880-0x58FF128RAM
0x6000-0x60012Writegalaxold_leds_w
0x60001Read PortIN0
0x0001UnusedActive Low
0x0002UnusedActive Low
0x0004UnusedActive Low
0x0008Button 1Active Low
0x0010Joystick RightActive Low
0x0020Joystick LeftActive Low
0x0040Coin 2Active Low
0x0080Coin 1Active Low
0x60021Writegalaxold_coin_lockout_w
0x60031Writegalaxold_coin_counter_w
0x6004-0x60074Device Writecust, galaxian_sound_device, lfo_freq_w
0x6800-0x68023Device Writecust, galaxian_sound_device, background_enable_w
0x68001Read PortIN1
0x00003Active High
0x00014Active High
0x00025Active High
0x00036Active High
0x0004UnusedActive Low
0x0008Button 1Active Low
0x0010Joystick RightActive Low
0x0020Joystick LeftActive Low
0x0040Start 2Active Low
0x0080Start 1Active Low
0x68031Device Writecust, galaxian_sound_device, noise_enable_w
0x68051Device Writecust, galaxian_sound_device, fire_enable_w
0x6806-0x68072Device Writecust, galaxian_sound_device, vol_w
0x70001Read PortIN2
0x0001UnusedActive Low
0x0000A 1C/1C B 2C/1CActive High
0x0002A 1C/2C B 1C/1CActive High
0x0004A 1C/3C B 3C/1CActive High
0x0006A 1C/4C B 4C/1CActive High
0x0000UprightActive High
0x0008CocktailActive High
0x00f0UnusedActive High
0x70011Writegalaxold_nmi_enable_w
0x70041Writegalaxold_stars_enable_w
0x70061Writegalaxold_flip_screen_x_w
0x70071Writegalaxold_flip_screen_y_w
0x7800-0x7FFF2048Device Readwatchdog, watchdog_timer_device, reset_r
0x78001Device Writecust, galaxian_sound_device, pitch_w
0xFFFC-0xFFFF4RAM
Memory Area:ozon1_io_map
Address RangeLengthFunctionDescription
0x0000-0x00012Device Writeaysnd, ay8910_device, data_address_w
Memory Area:ozon1_map
Address RangeLengthFunctionDescription
0x0000-0x2FFF12288ROM
0x4000-0x4200513RAM
0x4300-0x43FF256RAM
0x4800-0x4BFF1024Read/Write, Sharedgalaxold_videoram_r, galaxold_videoram_w, videoram
0x4C00-0x4FFF1024Writegalaxold_videoram_w
0x5000-0x503F64RAM Write, Sharedgalaxold_attributesram_w, attributesram
0x5040-0x505F32RAM, Sharedspriteram
0x68011Write NOP(//continuosly 0 and 1)
0x68021Writegalaxold_coin_counter_w
0x68061Writegalaxold_flip_screen_x_w
0x68071Writegalaxold_flip_screen_y_w
0x81001Read PortIN0
0x0001UnusedActive Low
0x0002UnusedActive Low
0x0004UnusedActive Low
0x0008Button 1Active Low
0x0010Joystick RightActive Low
0x0020Joystick LeftActive Low
0x0040Coin 2Active Low
0x0080Coin 1Active Low
0x81011Read PortIN1
0x00003Active High
0x00014Active High
0x00025Active High
0x00036Active High
0x0004UnusedActive Low
0x0008Button 1Active Low
0x0010Joystick RightActive Low
0x0020Joystick LeftActive Low
0x0040Start 2Active Low
0x0080Start 1Active Low
0x81021Read PortIN2
0x0001UnusedActive Low
0x0000A 1C/1C B 2C/1CActive High
0x0002A 1C/2C B 1C/1CActive High
0x0004A 1C/3C B 3C/1CActive High
0x0006A 1C/4C B 4C/1CActive High
0x0000UprightActive High
0x0008CocktailActive High
0x00f0UnusedActive High
0x81031Write NOP(//only one 9b at reset)
 

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
0x0000-0x07FF2048rom7.binCRC(464285e8) (Fluke: C1B1)
0x0800-0x0FFF2048rom8.binCRC(92056dcc) (Fluke: EDB2)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096rom1.binCRC(54899e8b) (Fluke: 9C70)
0x1000-0x1FFF4096rom2.binCRC(3c90fbfc) (Fluke: 49D4)
0x2000-0x2FFF4096rom3.binCRC(79fe313b) (Fluke: 0F60)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32ozon1.clrCRC(605ea6e9) (Fluke: 197E)
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