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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.
Space Encounters (Midway, 1980)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM, Write NOP
0x2000-0x3FFF8192Mirror, RAM, Shared0x4000, , main_ram
0x4000-0x5FFF8192ROM, Write NOP
Memory Area:spcenctr_io_map
Address RangeLengthFunctionDescription
0x0000-0x00FF256Writespcenctr_io_w
0x00001Mirror, Read Port0xfc, IN0
0x003fPositionalActive High
0x0040Button 1Active Low
0x0080Coin 1Active Low
0x00011Mirror, Read Port0xfc, IN1
0x003fPositional VActive High
0x0040UnusedActive Low
0x0080UnusedActive Low
0x00021Mirror, Read Port0xfc, IN2
0x0003Bonus_LifeActive High
0x00002000 4000 8000Active High
0x00013000 6000 12000Active High
0x00024000 8000 16000Active High
0x00035000 10000 20000Active High
0x000cCoinageActive High
0x00042C_1CActive High
0x00001C_1CActive High
0x000c2C_3CActive High
0x00081C_3CActive High
0x0000Bonus OnActive High
0x0030Bonus OffActive High
0x0020Cross HatchActive High
0x0010Test ModeActive High
0x000045Active High
0x004060Active High
0x008075Active High
0x00c090Active High
0x00031Mirror, Read NOP0xfc,
 

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:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF20484m33.hCRC(7458b2db) (Fluke: 3BED)
0x0800-0x0FFF20484m32.gCRC(1b873788) (Fluke: 4B2D)
0x1000-0x17FF20484m31.fCRC(d4319c91) (Fluke: C4D3)
0x1800-0x1FFF20484m30.eCRC(9b9a1a45) (Fluke: 5F78)
0x4000-0x47FF20484m29.dCRC(294d52ce) (Fluke: 84AF)
0x4800-0x4FFF20484m28.cCRC(ce44c923) (Fluke: A1B9)
0x5000-0x57FF20484m27.bCRC(098070ab) (Fluke: 6EAA)
0x5800-0x5FFF20484m26.aCRC(7f1d1f44) (Fluke: 6B1F)
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