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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.
Jr. Pac-Man (Bally Midway, 1983)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM Write, Sharedjrpacman_videoram_w, videoram
0x4800-0x4FEF2032RAM
0x4FF0-0x4FFF16RAM, Sharedspriteram
0x50001Writeirq_mask_w
0x5000-0x503F64Read PortP1
0x0001Joystick UpActive Low
0x0002Joystick LeftActive Low
0x0004Joystick RightActive Low
0x0008Joystick DownActive Low
0x0010OffActive High
0x0000OnActive High
0x0020Coin 1Active Low
0x0040Coin 2Active Low
0x0080Coin 3Active Low
0x50011Device Writenamco, namco_device, pacman_sound_enable_w
0x50031Writepacman_flipscreen_w
0x5040-0x507F64Read PortP2
0x0001Joystick UpActive Low
0x0002Joystick LeftActive Low
0x0004Joystick RightActive Low
0x0008Joystick DownActive Low
0x0020Start 1Active Low
0x0040Start 2Active Low
0x0080UprightActive High
0x0000CocktailActive High
0x5040-0x505F32Device Writenamco, namco_device, pacman_sound_w
0x5060-0x506F16Write Only, Sharedspriteram2
0x50701Writepengo_palettebank_w
0x50711Writepengo_colortablebank_w
0x50731Writejrpacman_bgpriority_w
0x50741Writejrpacman_charbank_w
0x50751Writejrpacman_spritebank_w
0x5080-0x50BF64Read PortDSW
0x0003CoinageActive High
0x00032C_1CActive High
0x00011C_1CActive High
0x00021C_2CActive High
0x0000Free_PlayActive High
0x000cLivesActive High
0x00001Active High
0x00042Active High
0x00083Active High
0x000c5Active High
0x0030Bonus_LifeActive High
0x000010000Active High
0x001015000Active High
0x002020000Active High
0x003030000Active High
0x0040DifficultyActive High
0x0040NormalActive High
0x0000HardActive High
0x0080UnknownActive High
0x0080OffActive High
0x0000OnActive High
0x50801Writejrpacman_scroll_w
0x50C01Write NOP
0x8000-0xDFFF24576ROM
Memory Area:port_map
Address RangeLengthFunctionDescription
0x00001Writejrpacman_interrupt_vector_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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jrp2c.2cCRC(0527ff9b),tiles (bank 1 & 2) (Fluke: 4B08)
0x2000-0x3FFF8192jrp2e.2eCRC(73477193),sprites (bank 1 & 2) (Fluke: 8F65)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192jrp8d.8dCRC(e3fa972e) (Fluke: 1EBD)
0x2000-0x3FFF8192jrp8e.8eCRC(ec889e94) (Fluke: 7D70)
0x8000-0x9FFF8192jrp8h.8hCRC(35f1fc6e) (Fluke: F892)
0xA000-0xBFFF8192jrp8j.8jCRC(9737099e) (Fluke: A054)
0xC000-0xDFFF8192jrp8k.8kCRC(5252dd97) (Fluke: 9687)
Memory Area:namco
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256a290-27axv-dxhd.7pCRC(a9cc86bf),waveform (Fluke: 71E8)
0x0100-0x01FF256a290-27axv-exhd.5sCRC(77245b66),timing - not used (Fluke: E0E5)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0020-0x011F256a290-27axv-axhd.9pCRC(9f6ea9d8),color lookup table (Fluke: BEB1)
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