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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 Raider (Universal, 1982)
Memory Area:sraider_cpu1_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x6000-0x6FFF4096RAM
0x7000-0x73FF1024Write Only, Sharedspriteram
0x80051Readsraider_8005_r (// protection check?)
0x80061Writesraider_sound_low_w
0x80071Writesraider_sound_high_w
0x90001Read PortIN0
0x0001Joystick LeftActive Low
0x0002Joystick DownActive Low
0x0004Joystick RightActive Low
0x0008Joystick UpActive Low
0x0010Button 1Active Low
0x0020Start 1Active Low
0x0040Start 2Active Low
0x0080UnknownActive Low
0x90011Read PortIN1
0x0001Joystick LeftActive Low
0x0002Joystick DownActive Low
0x0004Joystick RightActive Low
0x0008Joystick UpActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040Coin 1Active Low
0x0080Coin 2Active Low
0x90021Read PortDSW0
0x0003EasyActive High
0x0002MediumActive High
0x0001HardActive High
0x0000HardestActive High
0x00003 LettersActive High
0x000410 LettersActive High
0x0008NoActive High
0x0000YesActive High
0x0010OffActive High
0x0000OnActive High
0x0000UprightActive High
0x0020CocktailActive High
0x00002Active High
0x00c03Active High
0x00804Active High
0x00405Active High
0x90031Read PortDSW1
0x00064C_1CActive High
0x00083C_1CActive High
0x000a2C_1CActive High
0x00073C_2CActive High
0x00092C_2CActive High
0x000f1C_1CActive High
0x000e1C_2CActive High
0x000d1C_3CActive High
0x000c1C_4CActive High
0x000b1C_5CActive High
0x0000Free_PlayActive High
0x00604C_1CActive High
0x00803C_1CActive High
0x00a02C_1CActive High
0x00703C_2CActive High
0x00902C_2CActive High
0x00f01C_1CActive High
0x00e01C_2CActive High
0x00d01C_3CActive High
0x00c01C_4CActive High
0x00b01C_5CActive High
0x0000Free_PlayActive High
0xD000-0xD3FF1024Write, Sharedladybug_videoram_w, videoram
0xD400-0xD7FF1024Write, Sharedladybug_colorram_w, colorram
0xE0001Write NOP(//unknown 0x10 when in attract, 0x20 when coined/playing)
Memory Area:sraider_cpu2_io_map
Address RangeLengthFunctionDescription
0x00001Device Writesn1, sn76489_device, write
0x00081Device Writesn2, sn76489_device, write
0x00101Device Writesn3, sn76489_device, write
0x00181Device Writesn4, sn76489_device, write
0x00201Device Writesn5, sn76489_device, write
0x0028-0x003F24Writesraider_misc_w (// lots unknown)
Memory Area:sraider_cpu2_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x6000-0x63FF1024RAM
0x80001Readsraider_sound_low_r
0xA0001Readsraider_sound_high_r
0xC0001Read NOP(//some kind of sync)
0xE000-0xE0FF256Write Only, Sharedgrid_data
0xE8001Writesraider_io_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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096sraid-s0.k6CRC(a0373909) (Fluke: C4FD)
0x1000-0x1FFF4096sraids11.l6CRC(ba22d949) (Fluke: 72AD)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096sraid-s7.m2CRC(299f8e07) (Fluke: 51E7)
0x1000-0x1FFF4096sraid-s8.n2CRC(57ba8888) (Fluke: 1EB3)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096sraid-s9.f6CRC(2380b90f) (Fluke: A70E)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192sraid3.r4CRC(0f389774) (Fluke: 3DFF)
0x2000-0x3FFF8192sraid2.n4CRC(38a48db0) (Fluke: 410E)
0x4000-0x5FFF8192sraid1.m4CRC(2f302a4e) (Fluke: DFC5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32srpr10-1.a2CRC(121fdb99) (Fluke: 6FCF)
0x0020-0x003F32srpr10-2.l3CRC(88b67e70) (Fluke: 8F5D)
0x0040-0x005F32srpr10-3.c1CRC(27fa3a50),?? (Fluke: 8D0C)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192sraid-s4.h6CRC(57173a12) (Fluke: 954A)
0x2000-0x3FFF8192sraid-s5.j6CRC(5a459179) (Fluke: 6C86)
0x4000-0x5FFF8192sraid-s6.l6CRC(ea3aa25d) (Fluke: C895)
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