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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.
City Connection (Jaleco, 1985)
Memory Area:citycon_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096RAM
0x1000-0x1FFF4096RAM Write, Sharedcitycon_videoram_w, videoram
0x2000-0x20FF256RAM Write, Sharedcitycon_linecolor_w, linecolor
0x2800-0x28FF256RAM, Sharedspriteram
0x2800-0x2FFF2048Read/Write NOP(//0x2900-0x2fff cleared at post but unused)
0x30001Read, Writecitycon_in_r, citycon_background_w (/* player 1 & 2 inputs multiplexed */)
0x30011Read Port, Device WriteDSW1, soundlatch, generic_latch_8_device, write
0x0003LivesActive High
0x00003Active High
0x00014Active High
0x00025Active High
0x0003Infinite (Cheat)Active High
0x0020Demo_SoundsActive High
0x0020OffActive High
0x0000OnActive High
0x0040CabinetActive High
0x0000UprightActive High
0x0040CocktailActive High
0x0080Coin 1Active Low
0x30021Read Port, Device WriteDSW2, soundlatch2, generic_latch_8_device, write
0x0007CoinageActive High
0x00075C_1CActive High
0x00064C_1CActive High
0x00053C_1CActive High
0x00042C_1CActive High
0x00001C_1CActive High
0x00011C_2CActive High
0x00021C_3CActive High
0x00031C_4CActive High
0x0008DifficultyActive High
0x0000EasyActive High
0x0008HardActive High
0x0080Flip ScreenActive High
0x0080OffActive High
0x0000OnActive High
0x3004-0x30052Read NOP, Write Only, Sharedscroll
0x30071Readcitycon_irq_ack_r
0x3800-0x3CFF1280RAM Device Write, Sharedpalette, palette_device, write, palette
0x4000-0xFFFF49152ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096RAM
0x4000-0x40012Device Writeaysnd, ay8910_device, address_data_w
0x6000-0x60012Device Read/Writeymsnd, ym2203_device, read, write
0x8000-0xFFFF32768ROM
 

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
0x8000-0xFFFF32768c1CRC(1fad7589) (Fluke: 60E3)
0x8000-0xFFFF32768c1CRC(1fad7589) (Fluke: 60E3)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192c4CRC(a6b32fc6),Characters (Fluke: 5826)
0x0000-0x1FFF8192c4CRC(a6b32fc6),Characters (Fluke: 5826)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192c12CRC(08eaaccd),Sprites (Fluke: 0B8D)
0x0000-0x1FFF8192c12CRC(08eaaccd),Sprites (Fluke: 0B8D)
0x2000-0x3FFF8192c13CRC(1819aafb) (Fluke: F5A2)
0x2000-0x3FFF8192c13CRC(1819aafb) (Fluke: F5A2)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768c9CRC(8aeb47e6),Background tiles (Fluke: 698F)
0x0000-0x7FFF32768c9CRC(8aeb47e6),Background tiles (Fluke: 698F)
0x8000-0xBFFF16384c8CRC(0d7a1eeb) (Fluke: 3D58)
0x8000-0xBFFF16384c8CRC(0d7a1eeb) (Fluke: 3D58)
0xC000-0x13FFF32768c6CRC(2246fe9d) (Fluke: 7B05)
0xC000-0x13FFF32768c6CRC(2246fe9d) (Fluke: 7B05)
0x14000-0x17FFF16384c7CRC(e8b97de9) (Fluke: 4552)
0x14000-0x17FFF16384c7CRC(e8b97de9) (Fluke: 4552)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768c2CRC(f2da4f23),background maps (Fluke: 5760)
0x0000-0x7FFF32768c2CRC(f2da4f23),background maps (Fluke: 5760)
0x8000-0xBFFF16384c3CRC(7ef3ac1b) (Fluke: 37FC)
0x8000-0xBFFF16384c3CRC(7ef3ac1b) (Fluke: 37FC)
0xC000-0xDFFF8192c5CRC(c03d8b1b),color codes for the background (Fluke: 274C)
0xC000-0xDFFF8192c5CRC(c03d8b1b),color codes for the background (Fluke: 274C)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x4000-0x7FFF16384c10CRC(ae88b53c) (Fluke: 2A93)
0x4000-0x7FFF16384c10CRC(ae88b53c) (Fluke: 2A93)
0x8000-0xFFFF32768c11CRC(139eb1aa) (Fluke: 53BE)
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