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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.
Explorer (bootleg (Sidam), 1981)
Memory Area:explorer_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM
0x4800-0x4BFF1024Mirror, RAM Write, Shared0x0400, galaxian_videoram_w, videoram
0x5000-0x50FF256Mirror, RAM Write, Shared0x0700, galaxian_objram_w, spriteram
0x68001Write NOP(// ????)
0x68011Mirror, Write0x07f8, irq_enable_w
0x68021Mirror, Write0x07f8, coin_count_0_w
0x68031Mirror, Write0x07f8, scramble_background_enable_w
0x68041Mirror, Write0x07f8, galaxian_stars_enable_w
0x68051Mirror0x07f8 (//POUT2)
0x68061Mirror, Write0x07f8, galaxian_flip_screen_x_w
0x68071Mirror, Write0x07f8, galaxian_flip_screen_y_w
0x70001Mirror, Device Read/Write0x07ff, watchdog, watchdog_timer_device, reset_r, reset_w (/* watchdog works for writes as well? (or is it just disabled?) */)
0x80001Mirror, Read Port0x0ffc, IN0
0x0001Joystick UpActive High
0x0002Button 2Active High
0x0004Joystick DownActive High
0x0008Button 1Active High
0x0010Joystick RightActive High
0x0020Joystick LeftActive High
0x0040Coin 2Active High
0x0080Coin 1Active High
0x80001Mirror, Device Write0x0fff, soundlatch, generic_latch_8_device, write
0x80011Mirror, Read Port0x0ffc, IN1
0x0020UnknownActive High
0x0040Start 2Active High
0x0080Start 1Active High
0x80021Mirror, Read Port0x0ffc, IN2
0x00082C_1CActive High
0x00092C_2CActive High
0x00001C_1CActive High
0x000a2C_3CActive High
0x000b2C_4CActive High
0x00011C_2CActive High
0x000c2C_5CActive High
0x000d2C_6CActive High
0x00021C_3CActive High
0x000e2C_7CActive High
0x000f2C_8CActive High
0x00031C_4CActive High
0x00041C_5CActive High
0x00051C_6CActive High
0x00061C_7CActive High
0x00071C_8CActive High
0x00802C_1CActive High
0x00902C_2CActive High
0x00001C_1CActive High
0x00a02C_3CActive High
0x00b02C_4CActive High
0x00101C_2CActive High
0x00c02C_5CActive High
0x00d02C_6CActive High
0x00201C_3CActive High
0x00e02C_7CActive High
0x00f02C_8CActive High
0x00301C_4CActive High
0x00401C_5CActive High
0x00501C_6CActive High
0x00601C_7CActive High
0x00701C_8CActive High
0x80031Mirror, Read Port0x0ffc, IN3
0x00002Active High
0x00013Active High
0x00024Active High
0x00035Active High
0x000410000Active High
0x000c15000Active High
0x001420000Active High
0x001c25000Active High
0x000030000Active High
0x000850000Active High
0x001070000Active High
0x001890000Active High
0x90001Mirror, Write0x0fff, explorer_sound_control_w
Memory Area:galaxian_map_base
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x43FF1024Mirror, RAM0x0400,
0x5000-0x53FF1024Mirror, RAM Write, Shared0x0400, galaxian_videoram_w, videoram
0x5800-0x58FF256Mirror, RAM Write, Shared0x0700, galaxian_objram_w, spriteram
0x6000-0x60012Mirror, Write0x07f8, start_lamp_w
0x60001Mirror, Read Port0x07ff, IN0
0x0001Joystick UpActive High
0x0002Button 2Active High
0x0004Joystick DownActive High
0x0008Button 1Active High
0x0010Joystick RightActive High
0x0020Joystick LeftActive High
0x0040Coin 2Active High
0x0080Coin 1Active High
0x60021Mirror, Write0x07f8, coin_lock_w
0x60031Mirror, Write0x07f8, coin_count_0_w
0x68001Mirror, Read Port0x07ff, IN1
0x0020UnknownActive High
0x0040Start 2Active High
0x0080Start 1Active High
0x70001Mirror, Read Port0x07ff, IN2
0x00082C_1CActive High
0x00092C_2CActive High
0x00001C_1CActive High
0x000a2C_3CActive High
0x000b2C_4CActive High
0x00011C_2CActive High
0x000c2C_5CActive High
0x000d2C_6CActive High
0x00021C_3CActive High
0x000e2C_7CActive High
0x000f2C_8CActive High
0x00031C_4CActive High
0x00041C_5CActive High
0x00051C_6CActive High
0x00061C_7CActive High
0x00071C_8CActive High
0x00802C_1CActive High
0x00902C_2CActive High
0x00001C_1CActive High
0x00a02C_3CActive High
0x00b02C_4CActive High
0x00101C_2CActive High
0x00c02C_5CActive High
0x00d02C_6CActive High
0x00201C_3CActive High
0x00e02C_7CActive High
0x00f02C_8CActive High
0x00301C_4CActive High
0x00401C_5CActive High
0x00501C_6CActive High
0x00601C_7CActive High
0x00701C_8CActive High
0x70011Mirror, Write0x07f8, irq_enable_w
0x70041Mirror, Write0x07f8, galaxian_stars_enable_w
0x70061Mirror, Write0x07f8, galaxian_flip_screen_x_w
0x70071Mirror, Write0x07f8, galaxian_flip_screen_y_w
0x78001Mirror, Device Read0x07ff, watchdog, watchdog_timer_device, reset_r
Memory Area:konami_sound_map
Address RangeLengthFunctionDescription
0x0000-0x2FFF12288ROM
0x8000-0x83FF1024Mirror, RAM0x6c00,
0x9000-0x9FFF4096Mirror, Write0x6000, konami_sound_filter_w
Memory Area:konami_sound_portmap
Address RangeLengthFunctionDescription
0x0000-0x00FF256Read/Writekonami_ay8910_r, konami_ay8910_w
 

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
0x0000-0x0FFF40963f.binCRC(9faf18cf) (Fluke: 7E9E)
0x1000-0x17FF20484b.binCRC(e910b5c3) (Fluke: 2F9C)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048c2.5fCRC(4708845b) (Fluke: 0DA5)
0x0800-0x0FFF2048c1.5hCRC(11fd2887) (Fluke: B428)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF409610l.binCRC(d5adf626) (Fluke: FF2B)
0x1000-0x1FFF40969l.binCRC(48e32788) (Fluke: D077)
0x2000-0x2FFF40968l.binCRC(c0dbdbde) (Fluke: 9D78)
0x3000-0x3FFF40967l.binCRC(9b30d227) (Fluke: 1D21)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32c01s.6eCRC(4e3caeab) (Fluke: EC18)
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