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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.
Rally X (Namco, 1980)
Memory Area:io_map
Address RangeLengthFunctionDescription
0x00001Writerallyx_interrupt_vector_w
Memory Area:rallyx_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x8000-0x8FFF4096RAM Write, Sharedrallyx_videoram_w, videoram
0x9800-0x9FFF2048RAM
0xA000-0xA00F16Write Only, Sharedradarattr
0xA0001Read PortP1
0x0001Service 1Active Low
0x0002Button 1Active Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Joystick DownActive Low
0x0020Joystick UpActive Low
0x0040Start 1Active Low
0x0080Coin 1Active Low
0xA0801Read PortP2
0x0001CabinetActive High
0x0001UprightActive High
0x0000CocktailActive High
0x0002Button 1Active Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Joystick DownActive Low
0x0020Joystick UpActive Low
0x0040Start 2Active Low
0x0080Coin 2Active Low
0xA0801Device Writewatchdog, watchdog_timer_device, reset_w
0xA100-0xA11F32Device Writenamco, namco_device, pacman_sound_w
0xA1001Read PortDSW
0x00c0CoinageActive High
0x00402C_1CActive High
0x00c01C_1CActive High
0x00801C_2CActive High
0x0000Free_PlayActive High
0x0038DifficultyActive High
0x00101 Car, MediumActive High
0x00281 Car, HardActive High
0x00002 Cars, EasyActive High
0x00182 Cars, MediumActive High
0x00302 Cars, HardActive High
0x00083 Cars, EasyActive High
0x00203 Cars, MediumActive High
0x00383 Cars, HardActive High
0x0006Bonus_LifeActive High
0x000215000Active High
0x000430000Active High
0x000640000Active High
0x000220000Active High
0x000440000Active High
0x000660000Active High
0x000210000Active High
0x000420000Active High
0x000630000Active High
0x000215000Active High
0x000430000Active High
0x000640000Active High
0x000220000Active High
0x000440000Active High
0x000660000Active High
0x000210000Active High
0x000420000Active High
0x000630000Active High
0x000215000Active High
0x000430000Active High
0x000640000Active High
0x000220000Active High
0x000440000Active High
0x000660000Active High
0x0000NoneActive High
0xA1301Writerallyx_scrollx_w
0xA1401Writerallyx_scrolly_w
0xA1701Write NOP(/* ? */)
0xA180-0xA1878Writerallyx_latch_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
0x0000-0x0FFF40968eCRC(277c1de5) (Fluke: FFEE)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256rx1-6.8mCRC(3c16f62c),Prom type: IM5623 - dots (Fluke: 1701)
0x0000-0x00FF256rx1-6.8mCRC(3c16f62c),Prom type: IM5623 - dots (Fluke: 1701)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF40961bCRC(5882700d) (Fluke: F1F3)
0x1000-0x1FFF4096rallyxn.1eCRC(ed1eba2b) (Fluke: D622)
0x2000-0x2FFF4096rallyxn.1hCRC(4f98dd1c) (Fluke: 7AB3)
0x3000-0x3FFF4096rallyxn.1kCRC(9aacccf0) (Fluke: 36AF)
Memory Area:namco
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256rx1-5.3pCRC(4bad7017),Prom type: IM5623 (Fluke: 45C1)
0x0000-0x00FF256rx1-5.3pCRC(4bad7017),Prom type: IM5623 (Fluke: 45C1)
0x0100-0x01FF256rx1-4.2mCRC(77245b66),Prom type: IM5623 - not used (Fluke: E0E5)
0x0100-0x01FF256rx1-4.2mCRC(77245b66),Prom type: IM5623 - not used (Fluke: E0E5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32rx1-1.11nCRC(c7865434),Prom type: M3-7603-5 - palette (Fluke: 48B4)
0x0000-0x001F32rx1-1.11nCRC(c7865434),Prom type: M3-7603-5 - palette (Fluke: 48B4)
0x0020-0x011F256rx1-7.8pCRC(834d4fda),Prom type: IM5623 - lookup table (Fluke: 1EDA)
0x0020-0x011F256rx1-7.8pCRC(834d4fda),Prom type: IM5623 - lookup table (Fluke: 1EDA)
0x0120-0x013F32rx1-2.4nCRC(8f574815),Prom type: N82S123N - video layout (not used) (Fluke: 6A54)
0x0120-0x013F32rx1-2.4nCRC(8f574815),Prom type: N82S123N - video layout (not used) (Fluke: 6A54)
0x0140-0x015F32rx1-3.7kCRC(b8861096),Prom type: M3-7603-5 - video timing (not used) (Fluke: 11F3)
0x0140-0x015F32rx1-3.7kCRC(b8861096),Prom type: M3-7603-5 - video timing (not used) (Fluke: 11F3)
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