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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.
Pigskin 621AD (Midway, 1990)
Memory Area:mcr68_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x60000-0x63FFF16384RAM
0x70000-0x70FFF4096RAM Write, Sharedmcr68_videoram_w, videoram
0x71000-0x71FFF4096RAM
0x80000-0x80FFF4096RAM, Sharedspriteram
0x90000-0x9007F128Device Write, Sharedpalette, palette_device, write, palette
0xA0000-0xA000F16Read/Writemcr68_6840_upper_r, mcr68_6840_upper_w
0xB0000-0xBFFFF65536Device Writewatchdog, watchdog_timer_device, reset16_w
0xD0000-0xDFFFF65536Read PortIN0
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0010TiltActive Low
0x0040Service 1Active Low
0x0080UnknownActive Low
0x0100Joystick UpActive Low
0x0200Joystick DownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick RightActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000Button 3Active Low
0x8000UnusedActive Low
0xE0000-0xEFFFF65536Read PortIN1
0x000fUnusedActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080UnusedActive Low
0xff00UnusedActive High
0xF0000-0xFFFFF65536Read PortDSW
0x0003Game_TimeActive High
0x0000ShortestActive High
0x0002ShortActive High
0x0003MediumActive High
0x0001LongActive High
0x000cCoinageActive High
0x00082C_1CActive High
0x000c1C_1CActive High
0x0000Free_PlayActive High
0x0004Set Your OwnActive High
0x0010Demo_SoundsActive High
0x0000OffActive High
0x0010OnActive High
0x0020OffActive High
0x0000OnActive High
0x0000IndividualActive High
0x0040CommonActive High
0x0080JoystickActive High
0x0080StandardActive High
0x0000RotatedActive High
0xff00UnusedActive High
Memory Area:pigskin_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x80000-0x8FFFF65536Readpigskin_port_1_r
0xA0000-0xAFFFF65536Readpigskin_port_2_r
0xC0000-0xC007F128Device Write, Sharedpalette, palette_device, write, palette
0xE0000-0xEFFFF65536Device Writewatchdog, watchdog_timer_device, reset16_w
0x100000-0x100FFF4096RAM Write, Sharedmcr68_videoram_w, videoram
0x120000-0x1200012Read/Writepigskin_protection_r, pigskin_protection_w
0x140000-0x143FFF16384RAM
0x160000-0x1607FF2048RAM, Sharedspriteram
0x180000-0x18000F16Read/Writemcr68_6840_upper_r, mcr68_6840_upper_w
0x1A0000-0x1AFFFF65536Writearchrivl_control_w
0x1E0000-0x1EFFFF65536Read PortIN0
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0010TiltActive Low
0x0040Service 1Active Low
0x0080UnknownActive Low
0x0100Joystick UpActive Low
0x0200Joystick DownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick RightActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000Button 3Active Low
0x8000UnusedActive Low
 

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:cvsd:cpu
Address RangeLengthLabel/LocationDescription
0x10000-0x1FFFF65536pigskin_u4_sl1.u4CRC(6daf2d37) (Fluke: 2BDA)
0x10000-0x1FFFF65536pigskin_u4_sl1.u4CRC(6daf2d37) (Fluke: 2BDA)
0x10000-0x1FFFF65536pigskin_u4_sl1.u4CRC(6daf2d37) (Fluke: 2BDA)
0x30000-0x3FFFF65536pigskin_u19_sl1.u19CRC(56fd16a3) (Fluke: A602)
0x30000-0x3FFFF65536pigskin_u19_sl1.u19CRC(56fd16a3) (Fluke: A602)
0x30000-0x3FFFF65536pigskin_u19_sl1.u19CRC(56fd16a3) (Fluke: A602)
0x50000-0x5FFFF65536pigskin_u20_sl1.u20CRC(5d032fb8) (Fluke: A861)
0x50000-0x5FFFF65536pigskin_u20_sl1.u20CRC(5d032fb8) (Fluke: A861)
0x50000-0x5FFFF65536pigskin_u20_sl1.u20CRC(5d032fb8) (Fluke: A861)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536pigskin_e2_la1.e2CRC(12d5737b) (Fluke: 386F)
0x0000-0xFFFF65536pigskin_e2_la1.e2CRC(12d5737b) (Fluke: 386F)
0x0000-0xFFFF65536pigskin_e2_la1.e2CRC(12d5737b) (Fluke: 386F)
0x10000-0x1FFFF65536pigskin_e1_la1.e1CRC(460202a9) (Fluke: B2B7)
0x10000-0x1FFFF65536pigskin_e1_la1.e1CRC(460202a9) (Fluke: B2B7)
0x10000-0x1FFFF65536pigskin_e1_la1.e1CRC(460202a9) (Fluke: B2B7)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072pigskin_h15_la3.h15CRC(2655d03f) (Fluke: 5405)
0x20000-0x3FFFF131072pigskin_h17_la3.h17CRC(31c52ea7) (Fluke: 44E0)
0x40000-0x5FFFF131072pigskin_h18_la3.h18CRC(b36c4109) (Fluke: 30DA)
0x60000-0x7FFFF131072pigskin_h14_la3.h14CRC(09c87104) (Fluke: BB20)
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