1942 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.

1942 (Capcom (Williams Electronics license), 1985)

Memory Area:c1942_map

Address Range	Length	Function	Description
0x0000-0x7FFF	32768	ROM
0x8000-0xBFFF	16384	ROM Bank	bank1
0xC000	1	Read Port	SYSTEM
0xC001	1	Read Port	P1
0xC002	1	Read Port	P2
0xC003	1	Read Port	DSWA
0xC004	1	Read Port	DSWB
0xC800	1	Device Write	soundlatch, generic_latch_8_device, write
0xC802-0xC803	2	Write	c1942_scroll_w
0xC804	1	Write	c1942_c804_w
0xC805	1	Write	c1942_palette_bank_w
0xC806	1	Write	c1942_bankswitch_w
0xCC00-0xCC7F	128	RAM, Shared	spriteram
0xD000-0xD7FF	2048	RAM Write, Shared	c1942_fgvideoram_w, fg_videoram
0xD800-0xDBFF	1024	RAM Write, Shared	c1942_bgvideoram_w, bg_videoram
0xE000-0xEFFF	4096	RAM

Memory Area:sound_map

Address Range	Length	Function	Description
0x0000-0x3FFF	16384	ROM
0x4000-0x47FF	2048	RAM
0x6000	1	Device Read	soundlatch, generic_latch_8_device, read
0x8000-0x8001	2	Device Write	ay1, ay8910_device, address_data_w
0xC000-0xC001	2	Device Write	ay2, ay8910_device, address_data_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:audiocpu

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	sr-01.c11	CRC(bd87f06b) (Fluke: BFFD)

Memory Area:gfx1

Address Range	Length	Label/Location	Description
0x0000-0x1FFF	8192	sw-02.f2	CRC(f8e9ada2),characters (Fluke: 3B98)

Memory Area:gfx2

Address Range	Length	Label/Location	Description
0x0000-0x1FFF	8192	sr-08.a1	CRC(3884d9eb),tiles (Fluke: 01E6)
0x2000-0x3FFF	8192	sr-09.a2	CRC(999cf6e0) (Fluke: 328A)
0x4000-0x5FFF	8192	sr-10.a3	CRC(8edb273a) (Fluke: FF3F)
0x6000-0x7FFF	8192	sr-11.a4	CRC(3a2726c3) (Fluke: 728A)
0x8000-0x9FFF	8192	sr-12.a5	CRC(1bd3d8bb) (Fluke: A39D)
0xA000-0xBFFF	8192	sr-13.a6	CRC(658f02c4) (Fluke: 9416)

Memory Area:gfx3

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	sr-14.l1	CRC(2528bec6),sprites (Fluke: 5DB2)
0x4000-0x7FFF	16384	sr-15.l2	CRC(f89287aa) (Fluke: 45B4)
0x8000-0xBFFF	16384	sr-16.n1	CRC(024418f8) (Fluke: 71DB)
0xC000-0xFFFF	16384	sr-17.n2	CRC(e2c7e489) (Fluke: 4DAA)

Memory Area:maincpu

Address Range	Length	Label/Location	Description
0x0000-0x3FFF	16384	sw-03.m3	CRC(afd79770) (Fluke: 0171)
0x4000-0x7FFF	16384	sw-04.m4	CRC(933d9910) (Fluke: B8D3)
0x10000-0x13FFF	16384	sw-05.m5	CRC(e9a71bb6) (Fluke: B09C)
0x14000-0x15FFF	8192	sw-06.m6	CRC(466f8248),matches srb-06.m6 from 1942 (Revision B) (Fluke: DF6F)
0x18000-0x1BFFF	16384	sw-07.m7	CRC(ec41655e) (Fluke: B969)

Memory Area:proms

Address Range	Length	Label/Location	Description
0x0000-0x00FF	256	sb-5.e8	CRC(93ab8153),red component (Fluke: D9A9)
0x0100-0x01FF	256	sb-6.e9	CRC(8ab44f7d),green component (Fluke: 6C91)
0x0200-0x02FF	256	sb-7.e10	CRC(f4ade9a4),blue component (Fluke: 0F45)
0x0300-0x03FF	256	sb-0.f1	CRC(6047d91b),char lookup table (Fluke: C9C1)
0x0400-0x04FF	256	sb-4.d6	CRC(4858968d),tile lookup table (Fluke: CD40)
0x0500-0x05FF	256	sb-8.k3	CRC(f6fad943),sprite lookup table (Fluke: A6AC)
0x0600-0x06FF	256	sb-2.d1	CRC(8bb8b3df),tile palette selector? (not used) (Fluke: 14E1)
0x0700-0x07FF	256	sb-3.d2	CRC(3b0c99af),tile palette selector? (not used) (Fluke: 84D2)
0x0800-0x08FF	256	sb-1.k6	CRC(712ac508),interrupt timing (not used) (Fluke: DC38)
0x0900-0x09FF	256	sb-9.m11	CRC(4921635c),video timing? (not used) (Fluke: 1FB1)