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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.
Rock'n MegaSession (Jaleco, 1999)
Memory Area:rocknms_main_map
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM(// ROM)
0x100000-0x103FFF16384RAM, Sharedspriteram (// Object RAM)
0x104000-0x107FFF16384RAM(// Spare Object RAM)
0x108000-0x10FFFF32768RAM(// Work RAM)
0x200000-0x23FFFF262144Read/Writetetrisp2_priority_r, tetrisp2_priority_w
0x300000-0x31FFFF131072RAM Write, Sharedtetrisp2_palette_w, paletteram (// Palette)
0x600000-0x60FFFF65536RAM Write, Sharedtetrisp2_vram_rot_w, vram_rot (// Rotation)
0x800000-0x803FFF16384RAM Write, Sharedtetrisp2_vram_fg_w, vram_fg (// Foreground)
0x804000-0x807FFF16384RAM Write, Sharedtetrisp2_vram_bg_w, vram_bg (// Background)
0x900000-0x903FFF16384Read, Write, Sharedrockn_nvram_r, tetrisp2_nvram_w, nvram (// NVRAM)
0xA00000-0xA000012Writerocknms_main2sub_w (// MAIN -> SUB Communication)
0xA30000-0xA300012Read/Writerockn_soundvolume_r, rockn_soundvolume_w (// Sound Volume)
0xA40000-0xA400034Device Read/Write 8-bitymz, ymz280b_device, read, write, 0x00ff (// Sound)
0xA44000-0xA440012Read/Writerockn_adpcmbank_r, rockn_adpcmbank_w (// Sound Bank)
0xA48000-0xA480012Write NOP(// YMZ280 Reset)
0xB00000-0xB000012Writetetrisp2_coincounter_w (// Coin Counter)
0xB20000-0xB200012Write NOP(// ???)
0xB40000-0xB4000B12Write Only, Sharedscroll_fg (// Foreground Scrolling)
0xB40010-0xB4001B12Write Only, Sharedscroll_bg (// Background Scrolling)
0xB4003E-0xB4003F2Write NOP(// scr_size)
0xB60000-0xB6002F48Write Only, Sharedrotregs (// Rotation Registers)
0xBA0000-0xBA001F32Writerockn_systemregs_w (// system param)
0xBA001A-0xBA001B2Write NOP(// Lev 4 irq ack)
0xBA001E-0xBA001F2Write NOP(// Lev 2 irq ack)
0xBE0000-0xBE00012Read NOP(// INT-level1 dummy read)
0xBE0002-0xBE00032Read PortPLAYERS
0x0003SpecialActive High
0x0004Joystick LeftActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active High
0x0020Button 2Active High
0x0040Joystick RightActive Low
0x0080Joystick UpActive Low
0x0100UnknownActive Low
0x0200UnknownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick DownActive Low
0x1000Button 1Active High
0x2000Button 2Active High
0x4000Joystick RightActive Low
0x8000Joystick UpActive Low
0xBE0004-0xBE00052Read PortSYSTEM (// Inputs)
0x0001UnknownActive Low
0x0002UnknownActive Low
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0020Service 1Active Low
0x0040Coin 1Active Low
0x0080Coin 2Active Low
0x0100UnknownActive Low
0x0200UnknownActive Low
0x0400UnknownActive Low
0x0800UnknownActive Low
0x1000UnknownActive Low
0x2000UnknownActive Low
0x4000UnknownActive Low
0x8000UnknownActive Low
0xBE0008-0xBE00092Read PortDSW (// Inputs)
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
0x0100OffActive High
0x0000OnActive High
0x0200OffActive High
0x0000OnActive High
0x0400OffActive High
0x0000OnActive High
0x0800OffActive High
0x0000OnActive High
0x1000OffActive High
0x0000OnActive High
0x2000OffActive High
0x0000OnActive High
0x4000OffActive High
0x0000OnActive High
0x8000OffActive High
0x0000OnActive High
0xBE000A-0xBE000B2Device Readwatchdog, watchdog_timer_device, reset16_r (// Watchdog)
Memory Area:rocknms_sub_map
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM(// ROM)
0x100000-0x103FFF16384RAM, Sharedspriteram2 (// Object RAM)
0x104000-0x107FFF16384RAM(// Spare Object RAM)
0x108000-0x10FFFF32768RAM(// Work RAM)
0x200000-0x23FFFF262144RAM Write, Sharedrocknms_sub_priority_w, sub_priority (// Priority)
0x300000-0x31FFFF131072RAM Write, Sharedrocknms_sub_palette_w, sub_paletteram (// Palette)
0x600000-0x60FFFF65536RAM Write, Sharedrocknms_sub_vram_rot_w, sub_vram_rot (// Rotation)
0x800000-0x803FFF16384RAM Write, Sharedrocknms_sub_vram_fg_w, sub_vram_fg (// Foreground)
0x804000-0x807FFF16384RAM Write, Sharedrocknms_sub_vram_bg_w, sub_vram_bg (// Background)
0x900000-0x907FFF32768RAM(// NVRAM)
0xA30000-0xA300012Writerockn_soundvolume_w (// Sound Volume)
0xA40000-0xA400034Device Write 8-bitymz, ymz280b_device, write, 0x00ff (// Sound)
0xA44000-0xA440012Writerockn_adpcmbank_w (// Sound Bank)
0xA48000-0xA480012Write NOP(// YMZ280 Reset)
0xB00000-0xB000012Writerocknms_sub2main_w (// MAIN <- SUB Communication)
0xB20000-0xB200012Write NOP(// ???)
0xB40000-0xB4000B12Write Only, Sharedsub_scroll_fg (// Foreground Scrolling)
0xB40010-0xB4001B12Write Only, Sharedsub_scroll_bg (// Background Scrolling)
0xB4003E-0xB4003F2Write NOP(// scr_size)
0xB60000-0xB6002F48Write Only, Sharedsub_rotregs (// Rotation Registers)
0xBA0000-0xBA001F32Writerocknms_sub_systemregs_w (// system param)
0xBA001A-0xBA001B2Write NOP(// Lev 4 irq ack)
0xBA001E-0xBA001F2Write NOP(// Lev 2 irq ack)
0xBE0002-0xBE00032Read/Writerocknms_main2sub_r, rocknms_sub2main_w (// MAIN <-> SUB Communication)
0xBE000A-0xBE000B2Device Readwatchdog, watchdog_timer_device, reset16_r (// Watchdog)
 

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:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152mast_rotCRC(1f29b622) (Fluke: 98F7)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288mast_frontCRC(a4717579) (Fluke: F2EC)
Memory Area:gfx7
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152slav_rotCRC(0bab21f4) (Fluke: 7CD9)
Memory Area:gfx8
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288slav_frontCRC(b65734a7) (Fluke: C6AD)
Memory Area:ymz
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFFF4194304sound00CRC(8bafae71) (Fluke: 2954)
0x1000000-0x13FFFFF4194304sound01CRC(eec0589b) (Fluke: 0968)
0x1400000-0x17FFFFF4194304sound02CRC(564aa972) (Fluke: 6790)
0x1800000-0x1BFFFFF4194304sound03CRC(940302d0) (Fluke: F53B)
0x1C00000-0x1FFFFFF4194304sound04CRC(766db7f8) (Fluke: D8)
0x2000000-0x23FFFFF4194304sound05CRC(3a3002f9) (Fluke: AAC2)
0x2400000-0x27FFFFF4194304sound06CRC(06b04df9) (Fluke: D417)
0x2800000-0x2BFFFFF4194304sound07CRC(da74305e) (Fluke: 79C1)
0x2C00000-0x2FFFFFF4194304sound08CRC(b5a0aa48) (Fluke: EFB9)
0x3000000-0x33FFFFF4194304sound09CRC(0fd4a088) (Fluke: B2A8)
0x3400000-0x37FFFFF4194304sound10CRC(33c89e53) (Fluke: B49C)
0x3800000-0x3BFFFFF4194304sound11CRC(f9256a3f) (Fluke: 831F)
0x3C00000-0x3FFFFFF4194304sound12CRC(b0a09f3e) (Fluke: 75A8)
0x4000000-0x43FFFFF4194304sound13CRC(d5cee673) (Fluke: 6DD4)
0x4400000-0x47FFFFF4194304sound14CRC(b394aa8a) (Fluke: F95B)
0x4800000-0x4BFFFFF4194304sound15CRC(6c791501) (Fluke: 743C)
0x4C00000-0x4FFFFFF4194304sound16CRC(fe80159e) (Fluke: 5A20)
0x5000000-0x53FFFFF4194304sound17CRC(142c1159) (Fluke: 6188)
0x5400000-0x57FFFFF4194304sound18CRC(cc595d85) (Fluke: DE83)
0x5800000-0x5BFFFFF4194304sound19CRC(82b085a3) (Fluke: 8F08)
0x5C00000-0x5FFFFFF4194304sound20CRC(dd5e9680) (Fluke: EFF1)
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