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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.
Stepping 3 Superior (Jaleco, 1999)
Memory Area:stepstag_map
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM
0x100000-0x103FFF16384RAM(// Object RAM)
0x108000-0x10FFFF32768RAM(// Work RAM)
0x200000-0x23FFFF262144Read/Writetetrisp2_priority_r, tetrisp2_priority_w
0x300000-0x31FFFF131072RAM(// Palette)
0x400000-0x403FFF16384RAM Write, Sharedtetrisp2_vram_fg_w, vram_fg (// Foreground)
0x404000-0x407FFF16384RAM Write, Sharedtetrisp2_vram_bg_w, vram_bg (// Background)
0x500000-0x50FFFF65536RAM(// Line)
0x600000-0x60FFFF65536RAM Write, Sharedtetrisp2_vram_rot_w, vram_rot (// Rotation)
0x900000-0x903FFF16384Read/Write, Sharedtetrisp2_nvram_r, tetrisp2_nvram_w, nvram (// NVRAM)
0x904000-0x907FFF16384Read/Writetetrisp2_nvram_r, tetrisp2_nvram_w (// NVRAM (mirror))
0xA10000-0xA100012Read Port, WriteFEET, stepstag_leds_w (// I/O)
0xA42000-0xA420012Readunk_a42000_r (// visual ready flag + ???)
0xA44000-0xA440012Read NOP(// watchdog)
0xA50000-0xA500012Device Read, Writesoundlatch, generic_latch_16_device, read, stepstag_soundlatch_word_w
0xA60000-0xA600034Device Write 8-bitymz, ymz280b_device, write, 0x00ff (// Sound)
0xB00000-0xB000012Write NOP(// Coin Counter plus other things)
0xB20000-0xB200012Write NOP(// protection related?)
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)
0xBA001E-0xBA001F2Write NOP(// Lev 2 irq ack)
0xBE0000-0xBE00012Read NOP(// INT-level1 dummy read)
0xBE0002-0xBE00032Read PortBUTTONS (// Inputs)
0xBE0004-0xBE00052Readstepstag_coins_r (// Inputs & protection)
0xBE0008-0xBE00092Read PortDSW (// Inputs)
0xBE000A-0xBE000B2Read NOP(// watchdog)
Memory Area:stepstag_sub_map
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM
0x200000-0x20FFFF65536RAM
0x300000-0x33FFFF262144RAM(/*_WRITE(stepstag_palette_w)*/ AM_SHARE("paletteram"))
0x400000-0x43FFFF262144RAM(/*_WRITE(stepstag_palette_w)*/ AM_SHARE("paletteram2"))
0x500000-0x53FFFF262144RAM(/*_WRITE(stepstag_palette_w)*/ AM_SHARE("paletteram3"))
0x700000-0x7000012Write NOP(// 0-f)
0x700002-0x7000032Write NOP(// 0-f)
0x700004-0x7000052Write NOP(// 0-f)
0x700006-0x7000072Write NOP(// 0-3f (high bits?))
0x800000-0x87FFFF524288RAM
0x800000-0x803FFF16384RAM, Sharedspriteram (// Object RAM)
0x880000-0x8800012Write NOP(// cleared after writing this sprite list)
0x900000-0x97FFFF524288RAM
0x900000-0x903FFF16384RAM, Sharedspriteram2 (// Object RAM)
0x980000-0x9800012Write NOP(// cleared after writing this sprite list)
0xA00000-0xA7FFFF524288RAM
0xA00000-0xA03FFF16384RAM, Sharedspriteram3 (// Object RAM)
0xA80000-0xA800012Write NOP(// cleared after writing this sprite list)
0xB00000-0xB000012Device Read/Writesoundlatch, generic_latch_16_device, read, write
0xC00000-0xC000012Read, Write NOPunknown_read_0xc00000, (//??)
0xD00000-0xD000012Read NOP(// watchdog)
0xF00000-0xF000012Write NOP(//??)
0xFFFF00-0xFFFF012Readunknown_read_0xffff00
 

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:foreground
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFFF4194304mr99030-05.ic18CRC(dea7b8d6) (Fluke: 3CD4)
0x0000-0x3FFFFF4194304mr99030-05.ic18CRC(dea7b8d6) (Fluke: 3CD4)
Memory Area:sprites_horiz
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFFF4194304mr99030-04.ic17CRC(3eac3591) (Fluke: 14ED)
0x400000-0x7FFFFF4194304mr99030-05.ic18CRC(dea7b8d6) (Fluke: 3CD4)
0x400000-0x7FFFFF4194304mr99030-05.ic18CRC(dea7b8d6) (Fluke: 3CD4)
0x800000-0xBFFFFF4194304mr99030-06.ic19CRC(71489d79) (Fluke: 65DF)
Memory Area:sprites_vert
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFFF4194304mr9930-01.ic30CRC(9e3e054e) (Fluke: 32A5)
0x0000-0x3FFFFF4194304mr9930-01.ic2CRC(9e3e054e) (Fluke: 32A5)
0x400000-0x7FFFFF4194304mr9930-02.ic3CRC(b23c29f4) (Fluke: 85C6)
0x400000-0x7FFFFF4194304mr9930-02.ic29CRC(b23c29f4) (Fluke: 85C6)
0x800000-0xBFFFFF4194304mr9930-03.ic28CRC(9a5d070f) (Fluke: FC2F)
0x800000-0xBFFFFF4194304mr9930-03.ic4CRC(9a5d070f) (Fluke: FC2F)
0xC00000-0xFFFFFF4194304vj98348_step3_4_v1.1CRC(dec612df) (Fluke: D4B9)
0x1000000-0x13FFFFF4194304vj98348_step3_18_v1.1CRC(bc92f0a0) (Fluke: 691A)
0x1400000-0x17FFFFF4194304vj98348_step3_25_v1.1CRC(dec612df) (Fluke: D4B9)
Memory Area:ymz
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFFF4194304step3-sound
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