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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.
Poitto! (Metro / Able Corp., 1993)
Memory Area:metro_sound_io_map
Address RangeLengthFunctionDescription
0x00001Writemetro_portb_w
0x00001Writemetro_sound_rombank_w
0x00001Read/Writemetro_porta_r, metro_porta_w
Memory Area:metro_sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM(/* External ROM */)
0x4000-0x7FFF16384ROM Bankbank1 (/* External ROM (Banked) */)
0x8000-0x87FF2048RAM(/* External RAM */)
0xFF00-0xFFFF256RAM(/* Internal RAM */)
Memory Area:poitto_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM(// ROM)
0x400000-0x40FFFF65536RAM, Mirror0x0f0000 (// RAM (mirrored))
0x800000-0x8000012Read Port, WriteIN0, metro_soundstatus_w (// To Sound CPU)
0x800002-0x8000098Writemetro_coin_lockout_4words_w (// Coin Lockout)
0x800002-0x8000032Read PortIN1 (//)
0x800004-0x8000052Read PortDSW0 (//)
0x0300DifficultyActive High
0x0000EasyActive High
0x0300NormalActive High
0x0200HardActive High
0x0100HardestActive High
0x2000Allow_ContinueActive High
0x0000NoActive High
0x2000YesActive High
0x4000Demo_SoundsActive High
0x0000OffActive High
0x4000OnActive High
0x800006-0x8000072Read PortIN2 (//)
0xffffUnknownActive Low
0xC00000-0xC1FFFF131072RAM Write, Sharedmetro_vram_0_w, vram_0 (// Layer 0)
0xC20000-0xC3FFFF131072RAM Write, Sharedmetro_vram_1_w, vram_1 (// Layer 1)
0xC40000-0xC5FFFF131072RAM Write, Sharedmetro_vram_2_w, vram_2 (// Layer 2)
0xC60000-0xC6FFFF65536Readmetro_bankedrom_r (// Banked ROM)
0xC70000-0xC71FFF8192RAM(// ???)
0xC72000-0xC73FFF8192RAM Device Write, Sharedpalette, palette_device, write, palette (// Palette)
0xC74000-0xC74FFF4096RAM, Sharedspriteram (// Sprites)
0xC78000-0xC787FF2048RAM, Sharedtiletable (// Tiles Set)
0xC78800-0xC7881320Write Only, Sharedvideoregs (// Video Registers)
0xC78840-0xC7884D14Write, Sharedmetro_blitter_w, blitter_regs (// Tiles Blitter)
0xC78860-0xC7886B12Write, Sharedmetro_window_w, window (// Tilemap Window)
0xC78870-0xC7887B12Write Only, Sharedscroll (// Scroll Regs)
0xC78880-0xC788812Write NOP(// ? CRT)
0xC78890-0xC788912Write NOP(// ? CRT)
0xC788A2-0xC788A32Read/Writemetro_irq_cause_r,metro_irq_cause_w (// IRQ Cause / IRQ Acknowledge)
0xC788A4-0xC788A52Write Only, Sharedirq_enable (// IRQ Enable)
0xC788A8-0xC788A92Writemetro_soundlatch_w (// To Sound CPU)
0xC788AA-0xC788AB2Write Only, Sharedrombank (// Rom Bank)
0xC788AC-0xC788AD2Write Only, Sharedscreenctrl (// Screen Control)
 

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
0x0000-0x3FFF16384pt-jc08.3iCRC(f32d386a) (Fluke: E842)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144pt-jc07.3gCRC(5ae28b8d) (Fluke: 042A)
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