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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.
Scramble (bootleg (Reben S.A.), 1981)
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
0x60001Read PortIN0
0x0001Coin 1Active High
0x0002Coin 2Active High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0020Button 2Active High
0x0040Joystick DownActive High
0x0080Joystick DownActive High
0x6000-0x60012Writegalaxold_leds_w
0x60021Writegalaxold_coin_lockout_w
0x60031Writegalaxold_coin_counter_w
0x6004-0x60074Device Writecust, galaxian_sound_device, lfo_freq_w
0x68001Read PortIN1
0x0001Start 1Active High
0x0002Start 2Active High
0x0004Button 2Active High
0x0008Joystick UpActive High
0x0010Joystick UpActive High
0x0020Button 1Active High
0x0000A 1/1 B 1/6Active High
0x0002A 2/1 B 1/3Active High
0x0004A 1/2 B 1/6Active High
0x0006A 2/2 B 1/3Active High
0x6800-0x68023Device Writecust, galaxian_sound_device, background_enable_w
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
0x00003Active High
0x00014Active High
0x00025Active High
0x0003255 (Cheat)Active High
0x0000UprightActive High
0x0004CocktailActive High
0x0008OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x70011Writegalaxold_nmi_enable_w
0x70041Writegalaxold_stars_enable_w
0x70061Writegalaxold_flip_screen_x_w
0x70071Writegalaxold_flip_screen_y_w
0x78001Device Writecust, galaxian_sound_device, pitch_w
0x7800-0x7FFF2048Device Readwatchdog, watchdog_timer_device, reset_r
0xFFFC-0xFFFF4RAM
Memory Area:scrambler_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM
0x4800-0x4BFF1024RAM(// mirror, leftovers?)
0x5000-0x53FF1024RAM Write, Sharedgalaxold_videoram_w, videoram
0x5800-0x587F128RAM
0x5880-0x58BF64RAM Write, Sharedgalaxold_attributesram_w, attributesram
0x58C0-0x58DF32RAM, Sharedspriteram
0x58E0-0x58FF32RAM, Sharedbulletsram
0x60001Read PortIN0
0x0001Coin 1Active High
0x0002Coin 2Active High
0x0004Joystick LeftActive High
0x0008Joystick RightActive High
0x0010Button 1Active High
0x0020Button 2Active High
0x0040Joystick DownActive High
0x0080Joystick DownActive High
0x6000-0x60012Write NOP(/* sound triggers */)
0x60031Writegalaxold_coin_counter_w
0x6004-0x60074Device Writecust, galaxian_sound_device, lfo_freq_w
0x68001Read PortIN1
0x0001Start 1Active High
0x0002Start 2Active High
0x0004Button 2Active High
0x0008Joystick UpActive High
0x0010Joystick UpActive High
0x0020Button 1Active High
0x0000A 1/1 B 1/6Active High
0x0002A 2/1 B 1/3Active High
0x0004A 1/2 B 1/6Active High
0x0006A 2/2 B 1/3Active High
0x6800-0x68023Device Writecust, galaxian_sound_device, background_enable_w
0x68031Device Writecust, galaxian_sound_device, noise_enable_w (// should this disable the stars too?)
0x68051Device Writecust, galaxian_sound_device, fire_enable_w
0x6806-0x68072Device Writecust, galaxian_sound_device, vol_w
0x70001Read Port, WriteIN2, galaxold_nmi_enable_w
0x00003Active High
0x00014Active High
0x00025Active High
0x0003255 (Cheat)Active High
0x0000UprightActive High
0x0004CocktailActive High
0x0008OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x70021Writegalaxold_coin_counter_w
0x70031Writescrambold_background_enable_w
0x70041Writegalaxold_stars_enable_w
0x70061Writegalaxold_flip_screen_x_w
0x70071Writegalaxold_flip_screen_y_w
0x78001Device Writecust, galaxian_sound_device, pitch_w
0x78001Device Readwatchdog, watchdog_timer_device, reset_r
0x82021Readscrambler_protection_2_r
 

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
0x0000-0x07FF2048graph hj.binCRC(4c017c9c)
0x0000-0x001F32c01s.6eCRC(4e3caeab) (Fluke: EC18)
0x0800-0x0FFF2048graph kl.binCRC(28a66399)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048principal 1.binCRC(926958d2)
0x0800-0x0FFF2048principal 2.binCRC(655c6eca)
0x1000-0x17FF2048principal 3.binCRC(cd31749a)
0x1800-0x1FFF2048principal 4.binCRC(f055e1e3)
0x2000-0x27FF2048principal 5.binCRC(15f10df7)
0x2800-0x2FFF2048principal 6.binCRC(4bd1c703)
0x3000-0x37FF2048principal 7.binCRC(0bb49470) (Fluke: BE45)
0x3800-0x3FFF2048principal 8.binCRC(6db9f380)
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