Granny and the Gators 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.

Granny and the Gators (Bally, 1984)

Memory Area:granny_map

Address Range	Length	Function	Description
0x0000-0x0001	2	Read/Write	sound_data_r,sound_data_w
0x0002	1	Device Read/Write	crtc, tms9928a_device, vram_read, vram_write
0x0003	1	Device Read/Write	crtc, tms9928a_device, register_read, register_write
0x0004	1	Device Read/Write	crtc2, tms9928a_device, vram_read, vram_write
0x0005	1	Device Read/Write	crtc2, tms9928a_device, register_read, register_write
0x0006-0x0007	2	Write	granny_crtc_w (// can write to both at once)
0x0008-0x000B	4	Device Read/Write	pia_u7, pia6821_device, read, write
0x2000-0x27FF	2048	RAM
0x2801	1	Read NOP	(// The '9' test reads this location constantly and throws away the result)
0x4000-0xFFFF	49152	ROM

Memory Area:main_map

Address Range	Length	Function	Description
0x0000-0x007F	128	RAM	(// 128x8 in MC6810 U7 MPU)
0x0088-0x008B	4	Device Read/Write	pia_u10, pia6821_device, read, write (// PIA U10 MPU)
0x0090-0x0093	4	Device Read/Write	pia_u11, pia6821_device, read, write (// PIA U11 MPU)
0x0200-0x03FF	512	RAM, Shared	nvram (// 256x4 in 5101L U8 MPU, battery backed (D4-7 are data, A4-8 are address))
0x1000-0x17FF	2048	ROM, Region	roms, 0x0000
0x1800-0x1FFF	2048	ROM, Region	roms, 0x1000
0x5000-0x57FF	2048	ROM, Region	roms, 0x0800
0x5800-0x5FFF	2048	ROM, Region	roms, 0x1800
0x7000-0x7FFF	4096	ROM, Region	roms, 0x1000

Memory Area:sound_map

Address Range	Length	Function	Description
0xC000-0xFFFF	16384	ROM

Memory Area:sound_portmap

Address Range	Length	Function	Description
0x0000	1	Device Write	dac, dac_byte_interface, write (// P10-P17)
0x0000	1	Read/Write	m6803_port2_r, m6803_port2_w (// P20-P24 sound command in)

Memory Area:video_map

Address Range	Length	Function	Description
0x0000-0x1FFF	8192	Read/Write	sound_data_r,sound_data_w
0x2000-0x2003	4	Mirror, Device Read/Write	0x0ffc, pia_u7, pia6821_device, read, write (// PIA U7 Vidiot)
0x4000	1	Mirror, Device Read/Write	0x0ffe, crtc, tms9928a_device, vram_read, vram_write
0x4001	1	Mirror, Device Read/Write	0x0ffe, crtc, tms9928a_device, register_read, register_write
0x6000-0x63FF	1024	Mirror, RAM	0x1c00,
0x8000-0xFFFF	32768	ROM

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 Range	Length	Label/Location	Description
0xE000-0xFFFF	8192	cs_u3.764	CRC(0a39a51d)

Memory Area:roms

Address Range	Length	Label/Location	Description
0x0000-0x0FFF	4096	cpu_u2.532	CRC(d45bb956)
0x1000-0x1FFF	4096	cpu_u6.532	CRC(306aa673)

Memory Area:videocpu

Address Range	Length	Label/Location	Description
0x4000-0x5FFF	8192	vid_u4.764	CRC(3a3d4c6b)
0x6000-0x7FFF	8192	vid_u5.764	CRC(78bcb0fb)
0x8000-0x9FFF	8192	vid_u6.764	CRC(8d8220a6)
0xA000-0xBFFF	8192	vid_u7.764	CRC(aa71cf29)
0xC000-0xDFFF	8192	vid_u8.764	CRC(a442bc01)
0xE000-0xFFFF	8192	vid_u9.764	CRC(6b67a1f7)