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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.
Jumping Cross (SNK, 1984)
Memory Area:jcross_cpuA_map
Address RangeLengthFunctionDescription
0x0000-0x9FFF40960ROM
0xA0001Read PortIN0
0x0001Coin 1Active Low
0x0002UnknownActive Low
0x0004UnknownActive Low
0x0008Start 1Active Low
0x0010Start 2Active Low
0x0020SpecialActive High
0x0040UnknownActive Low
0x0080UnknownActive Low
0xA1001Read PortIN1
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 2Active Low
0x0020Button 1Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xA2001Read PortIN2
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 2Active Low
0x0020Button 1Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xA3001Writesgladiat_soundlatch_w
0xA4001Read PortDSW1
0x0001SingleActive High
0x0000DualActive High
0x0002CabinetActive High
0x0000UprightActive High
0x0002CocktailActive High
0x0004LivesActive High
0x00043Active High
0x00005Active High
0x0038CoinageActive High
0x00283C_1CActive High
0x00302C_1CActive High
0x00381C_1CActive High
0x00181C_2CActive High
0x00201C_3CActive High
0x0000Free_PlayActive High
0x0010INVALID !Active High
0x0008INVALID !Active High
0x00c0SpecialActive High
0xA5001Read PortDSW2
0x0001SpecialActive High
0x0006DifficultyActive High
0x0006EasyActive High
0x0004NormalActive High
0x0002HardActive High
0x0000HardestActive High
0x0018Demo Sounds OffActive High
0x0010Demo Sounds OnActive High
0x0000FreezeActive High
0x0008Infinite Lives (Cheat)Active High
0x0020Flip_ScreenActive High
0x0020OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0xA6001Writesgladiat_flipscreen_w (// flip screen, bg palette bank)
0xA7001Read/Writesnk_cpuB_nmi_trigger_r, snk_cpuA_nmi_ack_w
0xD3001Writejcross_scroll_msb_w
0xD4001Writesnk_sp16_scrolly_w
0xD5001Writesnk_sp16_scrollx_w
0xD6001Writesnk_bg_scrolly_w
0xD7001Writesnk_bg_scrollx_w
0xD800-0xDFFF2048RAM, Sharedspriteram (// + work ram)
0xE000-0xEFFF4096RAM Write, Sharedmarvins_bg_videoram_w, bg_videoram
0xF000-0xF7FF2048RAM Write, Sharedsnk_tx_videoram_w, tx_videoram (// + work RAM)
0xFFFF1Write NOP(// simply a program patch to not write to two not existing video registers?)
Memory Area:jcross_cpuB_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0xA7001Read/Writesnk_cpuA_nmi_trigger_r, snk_cpuB_nmi_ack_w
0xC000-0xC7FF2048RAM, Sharedspriteram
0xC800-0xD7FF4096RAM Write, Sharedmarvins_bg_videoram_w, bg_videoram
0xE000-0xE7FF2048RAM Write, Sharedsnk_tx_videoram_w, tx_videoram
Memory Area:jcross_sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x8000-0x87FF2048RAM
0xA0001Readsgladiat_soundlatch_r
0xC0001Readsgladiat_sound_nmi_ack_r
0xE000-0xE0012Device Writeay1, ay8910_device, address_data_w
0xE002-0xE0032Write NOP(// ? always FFFF, snkwave leftover?)
0xE004-0xE0052Device Writeay2, ay8910_device, address_data_w
Memory Area:jcross_sound_portmap
Address RangeLengthFunctionDescription
0x00001Readsgladiat_sound_irq_ack_r
 

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:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jcrosss0.f1CRC(9ae8ea93) (Fluke: A332)
0x2000-0x3FFF8192jcrosss1.h2CRC(83785601) (Fluke: 94FC)
Memory Area:bg_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jcrossb1.a2CRC(ea3dfbc9) (Fluke: A9F4)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jcrossa0.10bCRC(0e79bbcd) (Fluke: 1CE3)
0x2000-0x3FFF8192jcrossa1.12bCRC(999b2bcc) (Fluke: 1279)
0x4000-0x5FFF8192jcrossa2.13bCRC(ac89e49c) (Fluke: 2765)
0x6000-0x7FFF8192jcrossa3.14bCRC(4fd7848d) (Fluke: 6F80)
0x8000-0x9FFF8192jcrossa4.15bCRC(8500575d) (Fluke: 472C)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024jcrossp2.j7CRC(b72a96a5) (Fluke: C94A)
0x0400-0x07FF1024jcrossp1.j8CRC(35650448) (Fluke: BA34)
0x0800-0x0BFF1024jcrossp0.j9CRC(99f54d48) (Fluke: 6A4F)
Memory Area:sp16_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jcrossf0.l2CRC(4532509b) (Fluke: 8E22)
0x2000-0x3FFF8192jcrossf1.k2CRC(70d219bf) (Fluke: 26A0)
0x4000-0x5FFF8192jcrossf2.j2CRC(42a12b9d) (Fluke: 7B77)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jcrossb0.15aCRC(77ed51e7) (Fluke: 15AB)
0x2000-0x3FFF8192jcrossb1.14aCRC(23cf0f70) (Fluke: 469B)
0x4000-0x5FFF8192jcrossb2.13aCRC(5bed3118) (Fluke: 0ADE)
0x6000-0x7FFF8192jcrossb3.12aCRC(cd75dc95) (Fluke: 1FA6)
Memory Area:tx_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jcrossb4.10aCRC(08ad93fe) (Fluke: C9F9)
0x2000-0x3FFF8192jcrosss.d2CRC(3ebb5beb) (Fluke: 12AA)
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