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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.
Minefield (bootleg (The Logicshop), 1983)
Memory Area:minefldfe_map
Address RangeLengthFunctionDescription
0x0000-0x0BFF3072ROM(// ok)
0x0C00-0x0C3F64RAM Write, Sharedgalaxold_attributesram_w, attributesram (// ok)
0x0C40-0x0C5F32RAM, Sharedspriteram (// ok)
0x0C60-0x0C7F32RAM, Sharedbulletsram (// ok)
0x0C80-0x17FF2944RAM
0x1D981Device Readwatchdog, watchdog_timer_device, reset_r (// 0xb000)
0x2200-0x3FFF7680ROM(// ok)
0x4200-0x45FF1024RAM Write, Sharedgalaxold_videoram_w, videoram (// ok)
0x4B00-0x4B034Mirror, Device Read/Write0x00fc, ppi8255_0, i8255_device, read, write
0x0001Joystickright UpActive Low
0x0002Button 1Active Low
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x0010Joystickleft RightActive Low
0x0020Joystickleft LeftActive Low
0x0040Coin 2Active Low
0x0080Coin 1Active Low
0x4C00-0x4C034Mirror, Device Read/Write0x00fc, ppi8255_1, i8255_device, read, write
0x5800-0x6DFF5632ROM
0x76161Writegalaxold_flip_screen_x_w (// a806)
0x76171Writegalaxold_flip_screen_y_w (// a807)
0x76211Writegalaxold_nmi_enable_w (// a801)
0x76731Writescrambold_background_enable_w (// a083)
0x77041Writegalaxold_stars_enable_w (// a804)
0x8A00-0x91FF2048ROM
0xF8021Writegalaxold_coin_counter_w
Memory Area:scobra_sound_io_map
Address RangeLengthFunctionDescription
0x00101Device Writeay1, ay8910_device, address_w
0x00201Device Read/Writeay1, ay8910_device, data_r, data_w
0x00401Device Writeay2, ay8910_device, address_w
0x00801Device Read/Writeay2, ay8910_device, data_r, data_w
Memory Area:scobra_sound_map
Address RangeLengthFunctionDescription
0x0000-0x2FFF12288ROM
0x8000-0x83FF1024Write NOP, Sharedsoundram (/* only here to initialize pointer */)
0x8000-0x8FFF4096Read/Writescobra_soundram_r, scobra_soundram_w
0x9000-0x9FFF4096Writescramble_filter_w
Memory Area:type1_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
0x8800-0x8BFF1024RAM Write, Sharedgalaxold_videoram_w, videoram
0x8C00-0x8FFF1024Readgalaxold_videoram_r (/* mirror */)
0x8C00-0x8FFF1024RAM Writegalaxold_videoram_w (/* mirror */)
0x9000-0x903F64RAM Write, Sharedgalaxold_attributesram_w, attributesram
0x9040-0x905F32RAM, Sharedspriteram
0x9060-0x907F32RAM, Sharedbulletsram
0x9080-0x90FF128RAM
0x9800-0x98034Device Read/Writeppi8255_0, i8255_device, read, write
0x0001Joystickright UpActive Low
0x0002Button 1Active Low
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x0010Joystickleft RightActive Low
0x0020Joystickleft LeftActive Low
0x0040Coin 2Active Low
0x0080Coin 1Active Low
0xA000-0xA0034Device Read/Writeppi8255_1, i8255_device, read, write
0xA8011Writegalaxold_nmi_enable_w
0xA8021Writegalaxold_coin_counter_w
0xA8041Writegalaxold_stars_enable_w
0xA8061Writegalaxold_flip_screen_x_w
0xA8071Writegalaxold_flip_screen_y_w
0xB0001Device Readwatchdog, watchdog_timer_device, reset_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:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048snd.2lCRC(8bef736b) (Fluke: AE06)
0x0800-0x0FFF2048snd.2mCRC(f67b3f97) (Fluke: DF24)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048gfx.5fCRC(8b5e187a)
0x0800-0x0FFF2048gfx.5hCRC(4b7e1fbc)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0BFF3072sub-1.binCRC(0511df9f)
0x3600-0x3FFF2560sub-2.binCRC(00205e04)
0x8A00-0x91FF2048sub-3.binCRC(98c05d8d)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F3282s123.6eCRC(1877368e) (Fluke: 33E9)
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