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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.
Traverse USA / Zippy Race (Irem, 1983)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x8FFF4096RAM Write, Sharedtravrusa_videoram_w, videoram
0x90001Writetravrusa_scroll_x_low_w
0xA0001Writetravrusa_scroll_x_high_w
0xC800-0xC9FF512Write Only, Sharedspriteram
0xD0001Read PortSYSTEM (/* IN0 */)
0x0001Start 1Active Low
0x0002Start 2Active Low
0x0004Coin 3Active Low
0x0008Coin 1Active Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xD0001Device Writeirem_audio, irem_audio_device, cmd_w
0xD0011Read PortP1 (/* IN1 */)
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020Button 1Active Low
0x0040UnknownActive Low
0x0080Button 2Active Low
0xD0011Writetravrusa_flipscreen_w (/* + coin counters - not written by shtrider */)
0xD0021Read PortP2 (/* IN2 */)
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010Coin 2Active Low
0x0020Button 1Active Low
0x0040UnknownActive Low
0x0080Button 2Active Low
0xD0031Read PortDSW1 (/* DSW1 */)
0x0003LowActive High
0x0002MedActive High
0x0001HiActive High
0x0000MaxActive High
0x0004LowActive High
0x0000HiActive High
0x0008Allow_ContinueActive High
0x0008NoActive High
0x0000YesActive High
0x00f0CoinageActive High
0x0080Not UsedActive High
0x0090Not UsedActive High
0x00a06C_1CActive High
0x00b05C_1CActive High
0x00c04C_1CActive High
0x00d03C_1CActive High
0x00e02C_1CActive High
0x00f01C_1CActive High
0x00701C_2CActive High
0x00601C_3CActive High
0x00501C_4CActive High
0x00401C_5CActive High
0x00301C_6CActive High
0x00201C_7CActive High
0x0010Not UsedActive High
0x0000Free_PlayActive High
0x0080Free_PlayActive High
0x0090A 3C_1C / B 1C_3CActive High
0x00a0A 2C_1C / B 1C_3CActive High
0x00b0A 1C_1C / B 1C_3CActive High
0x00c0Free_PlayActive High
0x00d0A 3C_1C / B 1C_2CActive High
0x00e0A 2C_1C / B 1C_2CActive High
0x00f0A 1C_1C / B 1C_2CActive High
0x0070A 1C_1C / B 1C_5CActive High
0x0060A 2C_1C / B 1C_5CActive High
0x0050A 3C_1C / B 1C_5CActive High
0x0040Free_PlayActive High
0x0030A 1C_1C / B 1C_6CActive High
0x0020A 2C_1C / B 1C_6CActive High
0x0010A 3C_1C / B 1C_6CActive High
0x0000Free_PlayActive High
0xD0041Read PortDSW2 (/* DSW2 */)
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x0002CabinetActive High
0x0000UprightActive High
0x0002CocktailActive High
0x0004Mode 1Active High
0x0000Mode 2Active High
0x0008M/HActive High
0x0000Km/HActive High
0x0010OffActive High
0x0000OnActive High
0x0020Traverse USAActive High
0x0000Zippy RaceActive High
0x0040OffActive High
0x0000OnActive High
0xE000-0xEFFF4096RAM
 

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
0x0000-0x1FFF8192zippyrac.001CRC(aa8994dd) (Fluke: 273A)
0x2000-0x3FFF8192mr8.3cCRC(3a046dd1) (Fluke: A8F0)
0x4000-0x5FFF8192mr9.3aCRC(1cc3d3f4) (Fluke: 528C)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192zr1-8.n3CRC(3e2c7a6b) (Fluke: AE74)
0x2000-0x3FFF8192zr1-9.l3CRC(13be6a14) (Fluke: C831)
0x4000-0x5FFF8192zr1-10.k3CRC(6fcc9fdb) (Fluke: 3A03)
Memory Area:irem_audio:iremsound
Address RangeLengthLabel/LocationDescription
0x7000-0x7FFF4096mr10.1aCRC(a02ad8a0) (Fluke: AEE1)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192zr1-0.m3CRC(be066c0a) (Fluke: 83F7)
0x2000-0x3FFF8192zr1-5.l3CRC(145d6b34) (Fluke: 8B1B)
0x4000-0x5FFF8192zr1-6a.k3CRC(e1b51383) (Fluke: A34B)
0x6000-0x7FFF8192zr1-7.j3CRC(85cd1a51) (Fluke: 9381)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x01FF512mmi6349.ijCRC(c9724350),character palette - last $100 are unused (Fluke: 8DAE)
0x0200-0x021F32tbp18s.2CRC(a1130007),sprite palette (Fluke: 8C00)
0x0220-0x031F256tbp24s10.3CRC(76062638),sprite lookup table (Fluke: A986)
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