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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.
Star Guards (Bally Midway, 1987)
Memory Area:mcrmono_map
Address RangeLengthFunctionDescription
0x0000-0xDFFF57344ROM
0xE000-0xE7FF2048RAM, Sharednvram
0xE800-0xE9FF512RAM, Sharedspriteram
0xEA00-0xEBFF512RAM
0xEC00-0xEC7F128Mirror, Write, Shared0x0380, mcr_paletteram9_w, paletteram
0xF000-0xF7FF2048RAM Write, Sharedmcr3_videoram_w, videoram
0xF800-0xFFFF2048ROM(/* schematics show a 2716 @ 2B here, but nobody used it */)
Memory Area:mcrmono_portmap
Address RangeLengthFunctionDescription
0x00001Mirror, Read Port0x78, MONO.IP0
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0010SpecialActive High
0x0020TiltActive Low
0x0040Service 1Active Low
0x00011Mirror, Read Port0x78, MONO.IP1
0x0001Joystickright UpActive Low
0x0002Joystickright DownActive Low
0x0004Joystickright LeftActive Low
0x0008Joystickright RightActive Low
0x0010Joystickleft UpActive Low
0x0020Joystickleft DownActive Low
0x0040Joystickleft LeftActive Low
0x0080Joystickleft RightActive Low
0x00021Mirror, Read Port0x78, MONO.IP2
0x0001Joystickright UpActive Low
0x0002Joystickright DownActive Low
0x0004Joystickright LeftActive Low
0x0008Joystickright RightActive Low
0x0010Joystickleft UpActive Low
0x0020Joystickleft DownActive Low
0x0040Joystickleft LeftActive Low
0x0080Joystickleft RightActive Low
0x00031Mirror, Read Port0x78, MONO.IP3
0x0003UnusedActive Low
0x00088Active High
0x000c10Active High
0x000412Active High
0x000014Active High
0x0010UnusedActive Low
0x0000OffActive High
0x0020OnActive High
0x0080EasyActive High
0x00c0MediumActive High
0x0040HardActive High
0x0000HardestActive High
0x00041Mirror, Read Port0x78, MONO.IP4
0x0001Joystickright UpActive Low
0x0002Joystickright DownActive Low
0x0004Joystickright LeftActive Low
0x0008Joystickright RightActive Low
0x0010Joystickleft UpActive Low
0x0020Joystickleft DownActive Low
0x0040Joystickleft LeftActive Low
0x0080Joystickleft RightActive Low
0x00051Mirror, Write0x78, mcrmono_control_port_w
0x00071Mirror, Device Write0x78, watchdog, watchdog_timer_device, reset_w
0x00F0-0x00F34Mirror, Device Read/Write0x0c, ctc, z80ctc_device, read, write
 

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
0x0000-0x7FFF32768bg-0.15aCRC(ecfaef3e) (Fluke: CE55)
0x8000-0xFFFF32768bg-1.14bCRC(2c75569d) (Fluke: 38F3)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536fg-0.8eCRC(22797aaa) (Fluke: C3A3)
0x10000-0x1FFFF65536fg-1.6eCRC(413fa119) (Fluke: 9966)
0x20000-0x2FFFF65536fg-2.5eCRC(7036cfe6) (Fluke: 9F4A)
0x30000-0x3FFFF65536fg-3.4eCRC(cc5cc003) (Fluke: 5A8E)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768pro-0.3bCRC(3ad94aa2) (Fluke: 2D4B)
0x8000-0xFFFF32768pro-1.5bCRC(dba428b0) (Fluke: 5BE2)
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