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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.
Mega Blast (Taito Corporation, 1989)
Memory Area:megab_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM
0x100000-0x1000012Device Write 8-bittc0140syt, tc0140syt_device, master_port_w, 0xff00
0x100002-0x1000032Device Read/Write 8-bittc0140syt, tc0140syt_device, master_comm_r, master_comm_w, 0xff00
0x120000-0x12000F16Device Read/Write 8-bittc0220ioc, tc0220ioc_device, read, write, 0x00ff
0x180000-0x180FFF4096Read/Write, Sharedcchip2_word_r, cchip2_word_w, cchip2_ram
0x200000-0x20FFFF65536RAM
0x300000-0x301FFF8192RAM Device Write, Sharedpalette, palette_device, write, palette
0x400000-0x40001F32Device Write 8-bittc0360pri, tc0360pri_device, write, 0x00ff (/* ?? */)
0x600000-0x60FFFF65536Device Read/Writetc0100scn, tc0100scn_device, word_r, word_w (/* tilemaps */)
0x610000-0x61FFFF65536RAM(/* unused? */)
0x620000-0x62000F16Device Read/Writetc0100scn, tc0100scn_device, ctrl_word_r, ctrl_word_w
0x800000-0x80FFFF65536RAM, Sharedspriteram
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x7FFF16384ROM Bankbank2
0xC000-0xDFFF8192RAM
0xE000-0xE0034Device Read/Writeymsnd, ym2610_device, read, write
0xE2001Read NOP, Device Writetc0140syt, tc0140syt_device, slave_port_w
0xE2011Device Read/Writetc0140syt, tc0140syt_device, slave_comm_r, slave_comm_w
0xE400-0xE4034Write NOP(/* pan */)
0xEA001Read NOP
0xEE001Write NOP(/* ? */)
0xF0001Write NOP(/* ? */)
0xF2001Writesound_bankswitch_w (/* ?? */)
 

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
0x0000-0x3FFF16384c11-12.3CRC(b11094f1) (Fluke: 27A9)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288c11-05.58CRC(733e6d8e) (Fluke: 256A)
Memory Area:ymsnd
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288c11-01.29CRC(fd1ea532) (Fluke: 4CD1)
Memory Area:ymsnd.deltat
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288c11-02.30CRC(451cc187) (Fluke: 17F1)
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