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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.
Bosconian (Namco, 1981)
Memory Area:bosco_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM, Write NOP(/* the only area different for each CPU */)
0x6800-0x68078Readbosco_dsw_r
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_0, namco_06xx_device, data_r, data_w
0x71001Device Read/Write06xx_0, namco_06xx_device, ctrl_r, ctrl_w
0x7800-0x7FFF2048RAM, Sharedshare1
0x8000-0x8FFF4096RAM Write, Sharedbosco_videoram_w, videoram (/* + sprite registers */)
0x9000-0x90FF256Device Read/Write06xx_1, namco_06xx_device, data_r, data_w
0x91001Device Read/Write06xx_1, namco_06xx_device, ctrl_r, ctrl_w
0x9800-0x980F16Write Only, Sharedbosco_radarattr
0x98101Writebosco_scrollx_w
0x98201Writebosco_scrolly_w
0x98301Write Only, Sharedstarcontrol
0x98401Writebosco_starclr_w
0x98701Writebosco_flip_screen_w
0x9874-0x98752Write Only, Sharedbosco_starblink
 

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:52xx
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096bos1_9.5nCRC(09acc978) (Fluke: 2B86)
0x0000-0x0FFF4096bos1_9.5nCRC(09acc978) (Fluke: 2B86)
0x0000-0x0FFF4096bos1_9.5nCRC(09acc978) (Fluke: 2B86)
0x1000-0x1FFF4096bos1_10.5mCRC(e571e959) (Fluke: A0B5)
0x1000-0x1FFF4096bos1_10.5mCRC(e571e959) (Fluke: A0B5)
0x1000-0x1FFF4096bos1_10.5mCRC(e571e959) (Fluke: A0B5)
0x2000-0x2FFF4096bos1_11.5kCRC(17ac9511) (Fluke: 9898)
0x2000-0x2FFF4096bos1_11.5kCRC(17ac9511) (Fluke: 9898)
0x2000-0x2FFF4096bos1_11.5kCRC(17ac9511) (Fluke: 9898)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096bos1_14.5dCRC(a956d3c5) (Fluke: FF9C)
0x0000-0x0FFF4096bos1_14.5dCRC(a956d3c5) (Fluke: FF9C)
0x0000-0x0FFF4096bos1_14.5dCRC(a956d3c5) (Fluke: FF9C)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096bos1_13.5eCRC(e869219c) (Fluke: 7E2C)
0x0000-0x0FFF4096bos1_13.5eCRC(e869219c) (Fluke: 7E2C)
0x0000-0x0FFF4096bos1_13.5eCRC(e869219c) (Fluke: 7E2C)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256bos1-4.2rCRC(9b69b543),dots (Fluke: 2030)
0x0000-0x00FF256bos1-4.2rCRC(9b69b543),dots (Fluke: 2030)
0x0000-0x00FF256bos1-4.2rCRC(9b69b543),dots (Fluke: 2030)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096bos3_1.3nCRC(96021267) (Fluke: 772D)
0x1000-0x1FFF4096bos1_2.3mCRC(2d8f3ebe) (Fluke: 5F90)
0x1000-0x1FFF4096bos1_2.3mCRC(2d8f3ebe) (Fluke: 5F90)
0x1000-0x1FFF4096bos1_2.3mCRC(2d8f3ebe) (Fluke: 5F90)
0x2000-0x2FFF4096bos1_3.3lCRC(c80ccfa5) (Fluke: A222)
0x2000-0x2FFF4096bos1_3.3lCRC(c80ccfa5) (Fluke: A222)
0x2000-0x2FFF4096bos1_3.3lCRC(c80ccfa5) (Fluke: A222)
0x3000-0x3FFF4096bos1_4b.3kCRC(a3f7f4ab) (Fluke: 24B7)
0x3000-0x3FFF4096bos1_4b.3kCRC(a3f7f4ab) (Fluke: 24B7)
Memory Area:namco
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256bos1-1.1dCRC(de2316c6) (Fluke: BD2A)
0x0000-0x00FF256bos1-1.1dCRC(de2316c6) (Fluke: BD2A)
0x0000-0x00FF256bos1-1.1dCRC(de2316c6) (Fluke: BD2A)
0x0100-0x01FF256bos1-2.5cCRC(77245b66),timing - not used (Fluke: E0E5)
0x0100-0x01FF256bos1-2.5cCRC(77245b66),timing - not used (Fluke: E0E5)
0x0100-0x01FF256bos1-2.5cCRC(77245b66),timing - not used (Fluke: E0E5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32bos1-6.6bCRC(d2b96fb0),palette (Fluke: 78AB)
0x0000-0x001F32bos1-6.6bCRC(d2b96fb0),palette (Fluke: 78AB)
0x0000-0x001F32bos1-6.6bCRC(d2b96fb0),palette (Fluke: 78AB)
0x0020-0x011F256bos1-5.4mCRC(4e15d59c),lookup table (Fluke: 8C31)
0x0020-0x011F256bos1-5.4mCRC(4e15d59c),lookup table (Fluke: 8C31)
0x0020-0x011F256bos1-5.4mCRC(4e15d59c),lookup table (Fluke: 8C31)
0x0120-0x013F32bos1-3.2dCRC(b88d5ba9),video layout (not used) (Fluke: 9720)
0x0120-0x013F32bos1-3.2dCRC(b88d5ba9),video layout (not used) (Fluke: 9720)
0x0120-0x013F32bos1-3.2dCRC(b88d5ba9),video layout (not used) (Fluke: 9720)
0x0140-0x015F32bos1-7.7hCRC(87d61353),video timing (not used) (Fluke: D6B5)
0x0140-0x015F32bos1-7.7hCRC(87d61353),video timing (not used) (Fluke: D6B5)
0x0140-0x015F32bos1-7.7hCRC(87d61353),video timing (not used) (Fluke: D6B5)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096bos1_5c.3jCRC(a7c8e432) (Fluke: 9454)
0x0000-0x0FFF4096bos1_5c.3jCRC(a7c8e432) (Fluke: 9454)
0x1000-0x1FFF4096bos3_6.3hCRC(4543cf82) (Fluke: A21F)
Memory Area:sub2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096bos1_7.3eCRC(d45a4911) (Fluke: 7726)
0x0000-0x0FFF4096bos1_7.3eCRC(d45a4911) (Fluke: 7726)
0x0000-0x0FFF4096bos1_7.3eCRC(d45a4911) (Fluke: 7726)
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