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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 Walk (Midway, 1978)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM, Write NOP
0x2000-0x3FFF8192Mirror, RAM, Shared0x4000, , main_ram
0x4000-0x5FFF8192ROM, Write NOP
Memory Area:spacwalk_io_map
Address RangeLengthFunctionDescription
0x00001Read PortIN0
0x00ffSpecialActive High
0x00011Read PortIN1
0x0001UnusedActive Low
0x0002UnusedActive Low
0x0004UnusedActive Low
0x0008UnusedActive Low
0x0010Start 2Active Low
0x0020Start 1Active Low
0x0040Coin 1Active Low
0x0080UnusedActive Low
0x00011Device Writemb14241, mb14241_device, shift_count_w
0x00021Device Writemb14241, mb14241_device, shift_data_w
0x00021Read PortIN2
0x0003Game_TimeActive High
0x000340 seconds + 20 extendedActive High
0x000250 seconds + 25 extendedActive High
0x000160 seconds + 30 extendedActive High
0x000070 seconds + 35 extendedActive High
0x000340 secondsActive High
0x000250 secondsActive High
0x000160 secondsActive High
0x000070 secondsActive High
0x000cCoinageActive High
0x00001 Coin per PlayerActive High
0x00041 Coin/1 or 2 PlayersActive High
0x000c2 Coins per PlayerActive High
0x00082 Coins/1 or 2 PlayersActive High
0x0000NoneActive High
0x00105000Active High
0x00206000Active High
0x00307000Active High
0x0000OffActive High
0x0040OnActive High
0x00031Device Readmb14241, mb14241_device, shift_result_r
0x00031Writespacwalk_audio_1_w
0x00041Device Writewatchdog, watchdog_timer_device, reset_w
0x00051Writemidway_tone_generator_lo_w
0x00061Writemidway_tone_generator_hi_w
0x00071Writespacwalk_audio_2_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:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024sw.hCRC(1b07fc1f) (Fluke: AA00)
0x0400-0x07FF1024sw.gCRC(52220910) (Fluke: BEFA)
0x0800-0x0BFF1024sw.fCRC(787d4ef6) (Fluke: 5768)
0x0C00-0x0FFF1024sw.eCRC(d62d324b) (Fluke: 0F5C)
0x1000-0x13FF1024sw.dCRC(17dcc591) (Fluke: E39B)
0x1400-0x17FF1024sw.cCRC(61aef726) (Fluke: 40ED)
0x1800-0x1BFF1024sw.bCRC(c59d45d0) (Fluke: 31A7)
0x1C00-0x1FFF1024sw.aCRC(d563da07) (Fluke: 0956)
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