Spiders 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.

Spiders (Sigma Enterprises Inc., 1981)

Memory Area:spiders_audio_map

Address Range	Length	Function	Description
0x0000-0x007F	128	RAM
0x0080-0x0083	4	Device Read/Write	pia4, pia6821_device, read, write
0xF800-0xFFFF	2048	ROM

Memory Area:spiders_main_map

Address Range

Length

Function

Description

0x0000-0xBFFF

49152

RAM, Shared

ram

0xC000

Device Write

crtc, mc6845_device, address_w

0xC001

Device Read/Write

crtc, mc6845_device, register_r, register_w

0xC020-0xC027

RAM, Shared

nvram

0xC044-0xC047

Device Read/Write

pia1, pia6821_device, read, write

0x0001	Service 1	Active High
0x0002	Coin 1	Active High
0x0008	Button 1	Active High
0x0010	Button 1	Active High
0x0020	Start 1	Active High
0x0040	Start 2	Active High
0x0080	Service 2	Active High

0xC048-0xC04B

Device Read/Write

pia2, pia6821_device, read_alt, write_alt

0xC050-0xC053

Device Read/Write

pia3, pia6821_device, read, write

0xC060

Read Port

DSW1

0x0007	Coinage	Active High
0x0001	2C_1C	Active High
0x0007	1C_1C	Active High
0x0006	4C_5C	Active High
0x0004	1C_2C	Active High
0x0002	1C_3C	Active High
0x0000	Free_Play	Active High
0x00f8	Unused	Active Low

0xC080

Read Port

DSW2

0x0000	A A'	Active High
0x0001	A B'	Active High
0x0002	B A'	Active High
0x0003	B B'	Active High
0x0000	14	Active High
0x000c	16	Active High
0x0004	20	Active High
0x0008	26	Active High
0x0010	Lives	Active High
0x0010	3	Active High
0x0000	4	Active High
0x0060	Bonus_Life	Active High
0x0000	None	Active High
0x0060	15K	Active High
0x0020	20K	Active High
0x0040	25K	Active High
0x0000	First Screen	Active High
0x0080	Every Screen	Active High

0xC0A0

Read Port

DSW3

0x0001	Flip_Screen	Active High
0x0000	Off	Active High
0x0001	On	Active High
0x0002	Cabinet	Active High
0x0000	Upright	Active High
0x0002	Cocktail	Active High
0x0000	0	Active High
0x0004	1	Active High
0x0008	2	Active High
0x000c	3	Active High
0x0010	4	Active High
0x0014	5	Active High
0x0018	6	Active High
0x001c	7	Active High
0x0000	0	Active High
0x0020	1	Active High
0x0040	2	Active High
0x0060	3	Active High
0x0080	4	Active High
0x00a0	5	Active High
0x00c0	6	Active High
0x00e0	7	Active High

0xC100-0xFFFF

16128

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
0xF800-0xFFFF	2048	sp-ic3	CRC(944d761e) (Fluke: E1FE)
0xF800-0xFFFF	2048	sp-ic3	CRC(944d761e) (Fluke: E1FE)

Memory Area:gfx1

Address Range	Length	Label/Location	Description
0x0000-0x0FFF	4096	sp-ic33	CRC(b6731baa) (Fluke: FD8D)
0x0000-0x0FFF	4096	sp-ic33	CRC(b6731baa) (Fluke: FD8D)
0x1000-0x1FFF	4096	sp-ic25	CRC(baec64e7) (Fluke: F74A)
0x1000-0x1FFF	4096	sp-ic25	CRC(baec64e7) (Fluke: F74A)
0x2000-0x2FFF	4096	sp-ic24	CRC(a40a5517) (Fluke: 8B2A)
0x2000-0x2FFF	4096	sp-ic24	CRC(a40a5517) (Fluke: 8B2A)
0x2000-0x2FFF	4096	sp-ic24	CRC(a40a5517) (Fluke: 8B2A)
0x3000-0x3FFF	4096	sp-ic23	CRC(3ca08053) (Fluke: C0FD)
0x3000-0x3FFF	4096	sp-ic23	CRC(3ca08053) (Fluke: C0FD)
0x3000-0x3FFF	4096	sp-ic23	CRC(3ca08053) (Fluke: C0FD)
0x4000-0x4FFF	4096	sp-ic22	CRC(07ea073c) (Fluke: 92AD)
0x4000-0x4FFF	4096	sp-ic22	CRC(07ea073c) (Fluke: 92AD)
0x4000-0x4FFF	4096	sp-ic22	CRC(07ea073c) (Fluke: 92AD)
0x5000-0x5FFF	4096	sp-ic21	CRC(41b344b4) (Fluke: F89F)
0x5000-0x5FFF	4096	sp-ic21	CRC(41b344b4) (Fluke: F89F)
0x5000-0x5FFF	4096	sp-ic21	CRC(41b344b4) (Fluke: F89F)
0x6000-0x6FFF	4096	sp-ic20	CRC(4d37da5a) (Fluke: 9D89)
0x6000-0x6FFF	4096	sp-ic20	CRC(4d37da5a) (Fluke: 9D89)
0x6000-0x6FFF	4096	sp-ic20	CRC(4d37da5a) (Fluke: 9D89)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0xC000-0xCFFF	4096	sp-ic74	CRC(6a2578f6) (Fluke: 81C1)
0xC000-0xCFFF	4096	sp-ic74	CRC(6a2578f6) (Fluke: 81C1)
0xD000-0xDFFF	4096	sp-ic73	CRC(d69b2f21) (Fluke: 2530)
0xE000-0xEFFF	4096	sp-ic72	CRC(464125da) (Fluke: 2379)
0xE000-0xEFFF	4096	sp-ic72	CRC(464125da) (Fluke: 2379)
0xF000-0xFFFF	4096	sp-ic71	CRC(a9539b18) (Fluke: 5233)