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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.
Power Drift - Link Version (Sega, 1988)
Memory Area:link_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096ROM
0x2000-0x3FFF8192RAM(// 0x2000-0x2*** maybe shared with other boards?)
0x4000-0x47FF2048Device Read/Writemb8421, mb8421_device, right_r, right_w
Memory Area:link_portmap
Address RangeLengthFunctionDescription
0x00401Read PortLinkID_DSW1
0x0001OffActive High
0x0000OnActive High
0x0002OffActive High
0x0000OnActive High
0x0004OffActive High
0x0000OnActive High
0x0008OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x00C01Read PortLinkID_DSW2
0x00000Active High
0x00011Active High
0x00022Active High
0x00033Active High
0x00044Active High
0x00055Active High
0x00066Active High
0x00077Active High
0x00088Active High
0x00099Active High
0x000a10Active High
0x000b11Active High
0x000c12 (invalid)Active High
0x000d13 (invalid)Active High
0x000e14 (invalid)Active High
0x000f15 (invalid)Active High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
0x0080Master/SlaveActive High
0x0000Stand-AloneActive High
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM
0x80000-0x800078Mirror, Device Read/Write0x001ff8, multiplier_main, sega_315_5248_multiplier_device, read, write
0x82000-0x83FFF8192Writesound_data_w
0x84000-0x8401F32Mirror, Device Read/Write0x001fe0, divider_main, sega_315_5249_divider_device, read, write
0xC0000-0xCFFFF65536RAM, Sharedshareram
0x100000-0x10001F32Read/Writeio_chip_r, io_chip_w
0x100040-0x1000478Read/Writeanalog_r, analog_w
0x1F0000-0x1FFFFF65536RAM
Memory Area:main_map_link
Address RangeLengthFunctionDescription
0x190000-0x190FFF4096Device Read/Write 8-bitmb8421, mb8421_device, left_r, left_w, 0x00ff
0x191000-0x1910012Readlink_r
0x192000-0x1920012Read/Writelink2_r, link2_w
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0xEFFF61440ROM
0xF000-0xF0FF256Mirror, Device Read/Write0x0700, pcm, segapcm_device, sega_pcm_r, sega_pcm_w
0xF800-0xFFFF2048RAM
Memory Area:sound_portmap
Address RangeLengthFunctionDescription
0x0000-0x00012Mirror, Device Read/Write0x3e, ymsnd, ym2151_device, read, write
0x00401Mirror, Read0x3f, sound_data_r
Memory Area:subx_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x80000-0x800078Mirror, Device Read/Write0x001ff8, multiplier_subx, sega_315_5248_multiplier_device, read, write
0x84000-0x8401F32Mirror, Device Read/Write0x001fe0, divider_subx, sega_315_5249_divider_device, read, write
0xC0000-0xCFFFF65536RAM, Sharedshareram
0x180000-0x18FFFF65536RAM, Sharedysprites
0x1F8000-0x1FBFFF16384RAM
0x1FC000-0x1FFFFF16384RAM, Sharedbackupram
Memory Area:suby_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x80000-0x800078Mirror, Device Read/Write0x001ff8, multiplier_suby, sega_315_5248_multiplier_device, read, write
0x84000-0x8401F32Mirror, Device Read/Write0x001fe0, divider_suby, sega_315_5249_divider_device, read, write
0xC0000-0xCFFFF65536RAM, Sharedshareram
0x180000-0x1807FF2048Mirror, RAM, Shared0x007800, , rotateram
0x188000-0x188FFF4096Mirror, RAM, Shared0x007000, , bsprites
0x190000-0x193FFF16384Mirror, RAM Write, Shared0x004000, paletteram_w, paletteram
0x198000-0x19FFFF32768Device Readsegaic16vid, segaic16_video_device, rotate_control_r
0x1F0000-0x1FFFFF65536RAM
 

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:linkcpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768epr-12028CRC(bb682a92)
Memory Area:pcm
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288mpr-11754.107CRC(ebeb8484) (Fluke: 2891)
0x80000-0x9FFFF131072epr-11756.105CRC(12e43f8a) (Fluke: ED91)
0x100000-0x11FFFF131072epr-11755.106CRC(c2db1244) (Fluke: 53B0)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536epr-11899.102CRC(ed9fa889) (Fluke: C885)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072epr-11895.ic1CRC(ee99a6fd) (Fluke: 3978)
0x0000-0x1FFFF131072epr-11896.ic2CRC(4bebc015) (Fluke: 026F)
0x0000-0x1FFFF131072epr-11897.ic3CRC(4463cb95) (Fluke: D98D)
0x0000-0x1FFFF131072epr-11898.ic4CRC(5d19d767) (Fluke: 42C6)
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