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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.
Gradius III (Konami, 1989)
Memory Area:gradius3_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x40000-0x43FFF16384RAM
0x80000-0x80FFF4096RAM Device Write, Sharedpalette, palette_device, write, palette
0xC0000-0xC00012WritecpuA_ctrl_w (/* halt cpu B, irq enable, priority, coin counters, other? */)
0xC8000-0xC80012Read PortSYSTEM
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004UnknownActive Low
0x0008Start 1Active Low
0x0010Start 2Active Low
0x0020UnknownActive Low
0x0040Coin 3Active Low
0x0080UnknownActive Low
0xC8002-0xC80032Read PortP1
0xC8004-0xC80052Read PortP2
0xC8006-0xC80072Read PortDSW3
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x0002SingleActive High
0x0000DualActive High
0x00f0UnusedActive Low
0xD0000-0xD00012Read PortDSW1
0xD0002-0xD00032Read PortDSW2
0x0003LivesActive High
0x00032Active High
0x00023Active High
0x00015Active High
0x00007Active High
0x0004CabinetActive High
0x0000UprightActive High
0x0004CocktailActive High
0x0018Bonus_LifeActive High
0x001820k and every 70kActive High
0x0010100k and every 100kActive High
0x000850k onlyActive High
0x0000100k onlyActive High
0x0060DifficultyActive High
0x0060EasyActive High
0x0040NormalActive High
0x0020HardActive High
0x0000HardestActive High
0x0080Demo_SoundsActive High
0x0080OffActive High
0x0000OnActive High
0xD8000-0xD80012WritecpuB_irqtrigger_w
0xE0000-0xE00012Device Writewatchdog, watchdog_timer_device, reset16_w
0xE8000-0xE80012Device Write 8-bitsoundlatch, generic_latch_8_device, write, 0xff00
0xF0000-0xF00012Writesound_irq_w
0x100000-0x103FFF16384RAM, Sharedshare1
0x14C000-0x153FFF32768Read/Writek052109_halfword_r, k052109_halfword_w
0x180000-0x19FFFF131072RAM Write, Sharedgradius3_gfxram_w, k052109
Memory Area:gradius3_map2
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM
0x100000-0x103FFF16384RAM
0x140000-0x1400012WritecpuB_irqenable_w
0x200000-0x203FFF16384RAM, Sharedshare1
0x24C000-0x253FFF32768Read/Writek052109_halfword_r, k052109_halfword_w
0x280000-0x29FFFF131072RAM Write, Sharedgradius3_gfxram_w, k052109
0x2C0000-0x2C000F16Read/Writek051937_halfword_r, k051937_halfword_w
0x2C0800-0x2C0FFF2048Read/Writek051960_halfword_r, k051960_halfword_w
0x400000-0x5FFFFF2097152Readgradius3_gfxrom_r (/* gfx ROMs are mapped here, and copied to RAM */)
Memory Area:gradius3_s_map
Address RangeLengthFunctionDescription
0x0000-0xEFFF61440ROM
0xF0001Writesound_bank_w (/* 007232 bankswitch */)
0xF0101Device Readsoundlatch, generic_latch_8_device, read
0xF020-0xF02D14Device Read/Writek007232, k007232_device, read, write
0xF030-0xF0312Device Read/Writeymsnd, ym2151_device, read, write
0xF800-0xFFFF2048RAM
 

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:k007232
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144945_a10.b15CRC(1d083e10) (Fluke: CE17)
0x0000-0x3FFFF262144945_a10.b15CRC(1d083e10) (Fluke: CE17)
0x0000-0x3FFFF262144945_a10.b15CRC(1d083e10) (Fluke: CE17)
0x40000-0x5FFFF131072945_l11a.c18CRC(6043f4eb) (Fluke: C37D)
0x40000-0x5FFFF131072945_l11a.c18CRC(6043f4eb) (Fluke: C37D)
0x40000-0x5FFFF131072945_l11a.c18CRC(6043f4eb) (Fluke: C37D)
0x40000-0x5FFFF131072945_l11a.c18CRC(6043f4eb) (Fluke: C37D)
0x60000-0x7FFFF131072945_l11b.c20CRC(89ea3baf) (Fluke: AFB7)
0x60000-0x7FFFF131072945_l11b.c20CRC(89ea3baf) (Fluke: AFB7)
0x60000-0x7FFFF131072945_l11b.c20CRC(89ea3baf) (Fluke: AFB7)
0x60000-0x7FFFF131072945_l11b.c20CRC(89ea3baf) (Fluke: AFB7)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256945l14.j28CRC(c778c189),priority encoder (not used) (Fluke: F81A)
0x0000-0x00FF256945l14.j28CRC(c778c189),priority encoder (not used) (Fluke: F81A)
0x0000-0x00FF256945l14.j28CRC(c778c189),priority encoder (not used) (Fluke: F81A)
0x0000-0x00FF256945l14.j28CRC(c778c189),priority encoder (not used) (Fluke: F81A)
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