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.
Memory Area:digdug_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM, Write NOP(/* the only area different for each CPU */)
0x6800-0x681F32Device Writenamco, namco_device, pacman_sound_w
0x6820-0x68278Writebosco_latch_w (/* misc latches */)
0x68301Device Writewatchdog, watchdog_timer_device, reset_w
0x7000-0x70FF256Device Read/Write06xx, namco_06xx_device, data_r, data_w
0x71001Device Read/Write06xx, namco_06xx_device, ctrl_r, ctrl_w
0x8000-0x83FF1024RAM Write, Shareddigdug_videoram_w, videoram (/* tilemap RAM (bottom half of RAM 0 */)
0x8400-0x87FF1024RAM, Sharedshare1 (/* work RAM (top half for RAM 0 */)
0x8800-0x8BFF1024RAM, Shareddigdug_objram (/* work RAM + sprite registers */)
0x9000-0x93FF1024RAM, Shareddigdug_posram (/* work RAM + sprite registers */)
0x9800-0x9BFF1024RAM, Shareddigdug_flpram (/* work RAM + sprite registers */)
0xA000-0xA0078Read NOP, Writedigdug_PORT_w (/* video latches (spurious reads when setting latch bits) */)
0xB800-0xB83F64Device Read/Writeearom, atari_vg_earom_device, read, write (/* non volatile memory data */)
0xB8401Device Writeearom, atari_vg_earom_device, ctrl_w (/* non volatile memory 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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048"136007.108"CRC(3d24a3af)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096"136007.116"CRC(e22957c8)
0x1000-0x1FFF4096"136007.117"CRC(a3bbfd85)
0x2000-0x2FFF4096"136007.118"CRC(458499e9)
0x3000-0x3FFF4096"136007.119"CRC(c58252a0)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096"136007.115"CRC(754539be)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096"136007.114"CRC(d6822397)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096"136007.201"CRC(23d0b1a4)
0x1000-0x1FFF4096"136007.202"CRC(5453dc1f)
0x2000-0x2FFF4096"136007.203"CRC(c9077dfa)
0x3000-0x3FFF4096"136007.204"CRC(a8fc8eac)
Memory Area:namco
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256"136007.110"CRC(7a2815b4)
0x0100-0x01FF256"136007.109"CRC(77245b66),timing - not used
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32"136007.113"CRC(4cb9da99)
0x0020-0x011F256"136007.111"CRC(00c7c419)
0x0120-0x021F256"136007.112"CRC(e9b3e08e)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096"136007.205"CRC(5ba385c5)
0x1000-0x1FFF4096"136007.206"CRC(382b4011)
Memory Area:sub2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096"136007.107"CRC(a41bce72)
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