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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.
Lemmings (Data East USA, 1991)
Memory Area:lemmings_map
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM
0x100000-0x10FFFF65536RAM
0x120000-0x1207FF2048RAM, Sharedspriteram
0x140000-0x1407FF2048RAM, Sharedspriteram2
0x160000-0x160FFF4096RAM Device Write, Sharedpalette, palette_device, write, palette
0x170000-0x17000F16RAM Write, Sharedlemmings_control_w, control_data
0x190000-0x19000F16Readlemmings_trackball_r
0x1A0000-0x1A3FFF16384Read/Write, Sharedlem_protection_region_0_146_r,lem_protection_region_0_146_w, prot16ram (/* Protection device */)
0x1C0000-0x1C00012Device Writespriteram, buffered_spriteram16_device, write (/* 1 written once a frame */)
0x1E0000-0x1E00012Device Writespriteram2, buffered_spriteram16_device, write (/* 1 written once a frame */)
0x200000-0x201FFF8192RAM Write, Sharedlemmings_vram_w, vram_data
0x202000-0x202FFF4096RAM
0x300000-0x37FFFF524288RAM Write, Sharedlemmings_pixel_0_w, pixel_0_data
0x380000-0x39FFFF131072RAM Write, Sharedlemmings_pixel_1_w, pixel_1_data
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x07FF2048RAM
0x0800-0x08012Device Read/Writeymsnd, ym2151_device,read,write
0x10001Device Read/Writeoki, okim6295_device, read, write
0x18001Device Read, Writesoundlatch, generic_latch_8_device, read, lemmings_sound_ack_w
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
0x0000-0xFFFF65536lemmings.15CRC(f0b24a35) (Fluke: D003)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536lemmings.9CRC(e06442f5) (Fluke: D81F)
0x10000-0x1FFFF65536lemmings.10CRC(36398848) (Fluke: EC77)
0x20000-0x2FFFF65536lemmings.11CRC(b46a54e5) (Fluke: 448D)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536lemmings.12CRC(dc9047ff) (Fluke: 5351)
0x10000-0x1FFFF65536lemmings.13CRC(7cc15491) (Fluke: 4FEC)
0x20000-0x2FFFF65536lemmings.14CRC(c162788f) (Fluke: EA3A)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072lemmings.16CRC(f747847c) (Fluke: D31C)
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