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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.
Mag Max (Nichibutsu, 1985)
Memory Area:magmax_map
Address RangeLengthFunctionDescription
0x0000-0x13FFF81920ROM
0x18000-0x18FFF4096RAM
0x20000-0x207FF2048RAM, Sharedvideoram
0x28000-0x281FF512RAM, Sharedspriteram
0x30000-0x300012Read PortP1
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020SpeedActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x30002-0x300032Read PortP2
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x30004-0x300052Read PortSYSTEM
0x0001Start 1Active Low
0x0002Start 2Active Low
0x0004Coin 1Active Low
0x0008Coin 2Active Low
0x0010Service 1Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x30006-0x300072Read PortDSW
0x0003LivesActive High
0x00033Active High
0x00024Active High
0x00015Active High
0x00006Active High
0x000cBonus_LifeActive High
0x000c30k 80k 50k+Active High
0x000850k 120k 70k+Active High
0x000470k 160k 90k+Active High
0x000090k 200k 110k+Active High
0x0010Demo_SoundsActive High
0x0000OffActive High
0x0010OnActive High
0x0020CabinetActive High
0x0000UprightActive High
0x0020CocktailActive High
0x0300Coin_AActive High
0x01002C_1CActive High
0x03001C_1CActive High
0x02001C_2CActive High
0x0000Free_PlayActive High
0x0c00Coin_BActive High
0x00003C_1CActive High
0x04002C_3CActive High
0x0c001C_3CActive High
0x08001C_6CActive High
0x1000DifficultyActive High
0x1000EasyActive High
0x0000HardActive High
0x2000Flip_ScreenActive High
0x2000OffActive High
0x0000OnActive High
0x8000NoActive High
0x0000YesActive High
0x30010-0x300112Write, Sharedmagmax_vreg_w, vreg
0x30012-0x300132Write Only, Sharedscroll_x
0x30014-0x300152Write Only, Sharedscroll_y
0x3001C-0x3001D2Writemagmax_sound_w
0x3001E-0x3001F2Write NOP(/* IRQ ack */)
Memory Area:magmax_sound_io_map
Address RangeLengthFunctionDescription
0x0000-0x00012Device Writeay1, ay8910_device, address_data_w
0x0002-0x00032Device Writeay2, ay8910_device, address_data_w
0x0004-0x00052Device Writeay3, ay8910_device, address_data_w
0x00061Readmagmax_sound_r
Memory Area:magmax_sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x40001Readmagmax_sound_irq_ack
0x6000-0x67FF2048RAM
 

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
0x0000-0x1FFF819215.17bCRC(19e7b983) (Fluke: 88D1)
0x2000-0x3FFF819216.18bCRC(055e3126) (Fluke: 90D1)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819223.15gCRC(a7471da2) (Fluke: 6244)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819217.3eCRC(8e305b2e) (Fluke: 0CA9)
0x2000-0x3FFF819218.5eCRC(14c55a60) (Fluke: 6A80)
0x4000-0x5FFF819219.6eCRC(fa4141d8) (Fluke: 579F)
0x8000-0x9FFF819220.3gCRC(6fa3918b) (Fluke: 7433)
0xA000-0xBFFF819221.5gCRC(dd52eda4) (Fluke: AD6E)
0xC000-0xDFFF819222.6gCRC(4afc98ff) (Fluke: CA91)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256mag_e.10fCRC(75e4f06a),red (Fluke: 8180)
0x0100-0x01FF256mag_d.10eCRC(34b6a6e3),green (Fluke: 4365)
0x0200-0x02FF256mag_a.10dCRC(a7ea7718),blue (Fluke: F574)
0x0300-0x03FF256mag_g.2eCRC(830be358),sprites color lookup table (Fluke: 35FB)
0x0400-0x04FF256mag_f.13bCRC(4a6f9a6d),state machine data used for video signals generation (not used in emulation) (Fluke: 9FBB)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x4000-0x5FFF81929.18dCRC(9ecc9ab8),surface (Fluke: 1608)
0x6000-0x7FFF819210.20dCRC(e2ff7293),underground (Fluke: 8DC1)
0x8000-0x9FFF819211.15fCRC(91f3edb6),surface (Fluke: 4473)
0xA000-0xBFFF819212.17fCRC(99771eff),underground (Fluke: 0B69)
0xC000-0xDFFF819213.18fCRC(75f30159),surface of mechanical level (Fluke: F727)
0xE000-0xFFFF819214.20fCRC(96babcba),underground of mechanical level (Fluke: ABDE)
Memory Area:user2
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256mag_b.14dCRC(a0fb7297),background control PROM (Fluke: 26B7)
0x0100-0x01FF256mag_c.15dCRC(d84a6f78),background control PROM (Fluke: C2BC)
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