Jr. Pac-Man Memory Map

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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 (hack, 1983)

Memory Area:main_map

Address Range	Length	Function	Description
0x0000-0x3FFF	16384	ROM
0x4000-0x47FF	2048	RAM Write, Shared	jrpacman_videoram_w, videoram
0x4800-0x4FEF	2032	RAM
0x4FF0-0x4FFF	16	RAM, Shared	spriteram
0x5000	1	Write	irq_mask_w
0x5000-0x503F	64	Read Port	P1
0x5001	1	Device Write	namco, namco_device, pacman_sound_enable_w
0x5003	1	Write	pacman_flipscreen_w
0x5040-0x505F	32	Device Write	namco, namco_device, pacman_sound_w
0x5040-0x507F	64	Read Port	P2
0x5060-0x506F	16	Write Only, Shared	spriteram2
0x5070	1	Write	pengo_palettebank_w
0x5071	1	Write	pengo_colortablebank_w
0x5073	1	Write	jrpacman_bgpriority_w
0x5074	1	Write	jrpacman_charbank_w
0x5075	1	Write	jrpacman_spritebank_w
0x5080-0x50BF	64	Read Port	DSW
0x5080	1	Write	jrpacman_scroll_w
0x50C0	1	Write NOP
0x8000-0xDFFF	24576	ROM

Memory Area:port_map

Address Range	Length	Function	Description
0x0000	1	Write	jrpacman_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 Range	Length	Label/Location	Description
0x0000-0x1FFF	8192	jrp2c.2c	CRC(0527ff9b),tiles (bank 1 & 2) (Fluke: 4B08)
0x2000-0x3FFF	8192	jrp2e.2e	CRC(73477193),sprites (bank 1 & 2) (Fluke: 8F65)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0x0000-0x1FFF	8192	fast_jr.8d	CRC(461e8b57)
0x2000-0x3FFF	8192	jrp8e.8e	CRC(ec889e94) (Fluke: 7D70)
0x8000-0x9FFF	8192	jrp8h.8h	CRC(35f1fc6e) (Fluke: F892)
0xA000-0xBFFF	8192	jrp8j.8j	CRC(9737099e) (Fluke: A054)
0xC000-0xDFFF	8192	jrp8k.8k	CRC(5252dd97) (Fluke: 9687)

Memory Area:namco

Address Range	Length	Label/Location	Description
0x0000-0x00FF	256	a290-27axv-dxhd.7p	CRC(a9cc86bf),waveform (Fluke: 71E8)
0x0100-0x01FF	256	a290-27axv-exhd.5s	CRC(77245b66),timing - not used (Fluke: E0E5)

Memory Area:proms

Address Range	Length	Label/Location	Description
0x0020-0x011F	256	a290-27axv-axhd.9p	CRC(9f6ea9d8),color lookup table (Fluke: BEB1)