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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.
Return of the Invaders (Taito Corporation, 1985)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x7B00-0x7BFF256ROM(/* space for diagnostic ROM? The code looks */)
0x7FFF1Writecoincounter_w
0x8000-0x87FF2048RAM Write, Sharedfg_videoram_w, fg_videoram
0x8800-0x9FFF6144RAM, Sharedsharedram
0xA000-0xA7FF2048RAM Write, Sharedbg_videoram_w, bg_videoram
0xB800-0xB8023Writegfx_ctrl_w
0xC0001Read PortP1
0x0001UnusedActive Low
0x0002Joystick LeftActive Low
0x0004UnusedActive Low
0x0008Joystick RightActive Low
0x0010UnusedActive Low
0x0020UnusedActive Low
0x0040UnusedActive Low
0x0080Button 1Active Low
0xC0011Read PortP2
0x0001UnusedActive Low
0x0002Joystick LeftActive Low
0x0004UnusedActive Low
0x0008Joystick RightActive Low
0x0010UnusedActive Low
0x0020UnusedActive Low
0x0040UnusedActive Low
0x0080Button 1Active Low
0xC0021Read NOP(/* bit 7 must be 0, otherwise game resets */)
0xC0031Readmcu_status_r
0xC0041Read PortSYSTEM
0x0001Start 1Active Low
0x0002Start 2Active Low
0x0004TiltActive Low
0x0008Service 1Active Low
0x0010Coin 1Active High
0x0020Coin 2Active High
0x0040UnusedActive Low
0x0080UnusedActive Low
0xC0051Read PortDSW1
0x000330k, 80k & every 80kActive High
0x000230k, 80kActive High
0x000130kActive High
0x0000NoneActive High
0x0004NoActive High
0x0000YesActive High
0x00181Active High
0x00102Active High
0x00083Active High
0x00005Active High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0000UprightActive High
0x0080CocktailActive High
0xC0061Read PortDSW2
0x000f9C_1CActive High
0x000e8C_1CActive High
0x000d7C_1CActive High
0x000c6C_1CActive High
0x000b5C_1CActive High
0x000a4C_1CActive High
0x00093C_1CActive High
0x00082C_1CActive High
0x00001C_1CActive High
0x00011C_2CActive High
0x00021C_3CActive High
0x00031C_4CActive High
0x00041C_5CActive High
0x00051C_6CActive High
0x00061C_7CActive High
0x00071C_8CActive High
0x00f09C_1CActive High
0x00e08C_1CActive High
0x00d07C_1CActive High
0x00c06C_1CActive High
0x00b05C_1CActive High
0x00a04C_1CActive High
0x00903C_1CActive High
0x00802C_1CActive High
0x00001C_1CActive High
0x00101C_2CActive High
0x00201C_3CActive High
0x00301C_4CActive High
0x00401C_5CActive High
0x00501C_6CActive High
0x00601C_7CActive High
0x00701C_8CActive High
0xC0071Read PortDSW3
0x0001OffActive High
0x0000OnActive High
0x0002OffActive High
0x0000OnActive High
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x0000NoActive High
0x0010YesActive High
0x0000NoActive High
0x0020YesActive High
0x0040OffActive High
0x0000OnActive High
0x0080A and BActive High
0x0000A onlyActive High
0xC8001Writeirq0_ack_w
0xC8011Writecoinlockout_w
0xC8021Writecpu2_reset_w
0xC8031Writemcu_reset_w
0xC8051Writecpu1_reset_w
0xD0001Device Writewatchdog, watchdog_timer_device, reset_w
0xD8001Writesoundcommand_w
0xE0001Readmcu_r
0xE8001Writemcu_w
0xF8001Readcpu0_mf800_r
Memory Area:mcu_map
Address RangeLengthFunctionDescription
0x00001Read/Writemcu_portA_r, mcu_portA_w
0x00011Read/Writemcu_portB_r, mcu_portB_w
0x00021Read/Writemcu_portC_r, mcu_portC_w
0x00041Writemcu_ddrA_w
0x00051Writemcu_ddrB_w
0x00061Writemcu_ddrC_w
0x0010-0x007F112RAM
0x0080-0x07FF1920ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM
0x2000-0x27FF2048RAM
0x40001Device Readsoundlatch, generic_latch_8_device, read
0x60001Writecpu2_m6000_w
0x80001Device Writesn1, sn76496_device, write
0xA0001Device Writesn2, sn76496_device, write
0xE000-0xFFFF8192ROM(/* space for diagnostic ROM */)
Memory Area:sub_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM
0x8000-0x87FF2048RAM Write, Sharedfg_videoram_w, fg_videoram
0x8800-0x9FFF6144RAM, Sharedsharedram
0xA000-0xA7FF2048RAM Write, Sharedbg_videoram_w, bg_videoram
0xC8041Writeirq1_ack_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:68705
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048a37-09.37BAD_DUMP CRC(79bd6ded) (Fluke: 8FB6)
Memory Area:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192a37-05.17CRC(9025abea) (Fluke: C83E)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192a37-16.61CRC(4e3f501c) (Fluke: 2FAF)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192a37-10.8CRC(6afdeec8) (Fluke: A5E5)
0x2000-0x3FFF8192a37-11.9CRC(d3dc9da3) (Fluke: 8E97)
0x4000-0x5FFF8192a37-12.10CRC(d10b2eed) (Fluke: D796)
0x6000-0x7FFF8192a37-13.11CRC(00ca6b3d) (Fluke: 0ACE)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192a37-14.55CRC(ef7f8651) (Fluke: 825D)
0x2000-0x3FFF8192a37-15.56CRC(03b40905) (Fluke: 8B2A)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192a37-03.70CRC(eae7459d) (Fluke: FB31)
0x2000-0x3FFF8192a37-02.71CRC(72895e37) (Fluke: 1D2A)
0x4000-0x5FFF8192a37-01.72CRC(505dd20b) (Fluke: 43E3)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256a37-06.13CRC(e9643b8b),palette red bits (Fluke: 18B1)
0x0100-0x01FF256a37-07.4CRC(e8f34e11),palette green bits (Fluke: 1707)
0x0200-0x02FF256a37-08.3CRC(50030af0),palette blue bits (Fluke: 2E7A)
0x0300-0x0AFF204882s191nCRC(93c891e3),lookup table (Fluke: 7295)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192a37-04.62CRC(d2899cc1) (Fluke: F65D)
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