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.
Memory Area:circusc_map
Address RangeLengthFunctionDescription
0x00001Mirror, Write0x03f8, circusc_flipscreen_w (/* FLIP */)
0x00011Mirror, Write0x03f8, irq_mask_w (/* INTST */)
0x0003-0x00042Mirror, Write0x03f8, circusc_coin_counter_w (/* COIN1, COIN2 */)
0x00051Mirror, Write Only, Shared0x03f8, , spritebank (/* OBJ CHENG */)
0x04001Mirror, Device Write0x03ff, watchdog, watchdog_timer_device, reset_w (/* WDOG */)
0x08001Mirror, Device Write0x03ff, soundlatch, generic_latch_8_device, write (/* SOUND DATA */)
0x0C001Mirror, Write0x03ff, circusc_sh_irqtrigger_w (/* SOUND-ON causes interrupt on audio CPU */)
0x10001Mirror, Read Port0x03fc, SYSTEM
0x10011Mirror, Read Port0x03fc, P1
0x10021Mirror, Read Port0x03fc, P2
0x10031Mirror, Read NOP0x03fc, (/* unpopulated DIPSW 3*/)
0x14001Mirror, Read Port0x03ff, DSW1
0x18001Mirror, Read Port0x03ff, DSW2
0x1C001Mirror, Write Only, Shared0x03ff, , scroll (/* VGAP */)
0x2000-0x2FFF4096RAM
0x3000-0x33FF1024RAM Write, Sharedcircusc_colorram_w, colorram (/* colorram */)
0x3400-0x37FF1024RAM Write, Sharedcircusc_videoram_w, videoram (/* videoram */)
0x3800-0x38FF256RAM, Sharedspriteram_2 (/* spriteram2 */)
0x3900-0x39FF256RAM, Sharedspriteram (/* spriteram */)
0x3A00-0x3FFF1536RAM
0x6000-0xFFFF40960ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x43FF1024Mirror, RAM0x1c00,
0x60001Mirror, Device Read0x1fff, soundlatch, generic_latch_8_device, read (/* CS0 */)
0x80001Mirror, Read0x1fff, circusc_sh_timer_r (/* CS1 */)
0xA000-0xA07F128Mirror, Write0x1f80, circusc_sound_w (/* CS2 - CS6 */)
 

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 RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192380_l14.5cCRC(607df0fb) (Fluke: A5E4)
0x0000-0x1FFF8192380_l14.5cCRC(607df0fb) (Fluke: A5E4)
0x2000-0x3FFF8192380_l15.7cCRC(a6ad30e1) (Fluke: 7529)
0x2000-0x3FFF8192380_l15.7cCRC(a6ad30e1) (Fluke: 7529)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192380_j12.4aCRC(56e5b408) (Fluke: 3DE9)
0x0000-0x1FFF8192380_j12.4aCRC(56e5b408) (Fluke: 3DE9)
0x2000-0x3FFF8192380_j13.5aCRC(5aca0193) (Fluke: 1ACE)
0x2000-0x3FFF8192380_j13.5aCRC(5aca0193) (Fluke: 1ACE)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192380_j06.11eCRC(df0405c6) (Fluke: 538B)
0x0000-0x1FFF8192380_j06.11eCRC(df0405c6) (Fluke: 538B)
0x2000-0x3FFF8192380_j07.12eCRC(23dfe3a6) (Fluke: 08DD)
0x2000-0x3FFF8192380_j07.12eCRC(23dfe3a6) (Fluke: 08DD)
0x4000-0x5FFF8192380_j08.13eCRC(3ba95390) (Fluke: 5779)
0x4000-0x5FFF8192380_j08.13eCRC(3ba95390) (Fluke: 5779)
0x6000-0x7FFF8192380_j09.14eCRC(a9fba85a) (Fluke: 5E5B)
0x6000-0x7FFF8192380_j09.14eCRC(a9fba85a) (Fluke: 5E5B)
0x8000-0x9FFF8192380_j10.15eCRC(0532347e) (Fluke: F663)
0x8000-0x9FFF8192380_j10.15eCRC(0532347e) (Fluke: F663)
0xA000-0xBFFF8192380_j11.16eCRC(e1725d24) (Fluke: AD4B)
0xA000-0xBFFF8192380_j11.16eCRC(e1725d24) (Fluke: AD4B)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x6000-0x7FFF8192380_u05.3hCRC(964c035a) (Fluke: 334E)
0x8000-0x9FFF8192380_p04.4hCRC(dd0c0ee7) (Fluke: CA2F)
0x8000-0x9FFF8192380_p04.4hCRC(dd0c0ee7) (Fluke: CA2F)
0xA000-0xBFFF8192380_p03.5hCRC(190247af) (Fluke: 37BD)
0xA000-0xBFFF8192380_p03.5hCRC(190247af) (Fluke: 37BD)
0xC000-0xDFFF8192380_p02.6hCRC(7e63725e) (Fluke: F6B4)
0xC000-0xDFFF8192380_p02.6hCRC(7e63725e) (Fluke: F6B4)
0xE000-0xFFFF8192380_p01.7hCRC(eedaa5b2) (Fluke: A9B0)
0xE000-0xFFFF8192380_p01.7hCRC(eedaa5b2) (Fluke: A9B0)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32380_j18.2aCRC(10dd4eaa),palette (Fluke: C605)
0x0000-0x001F32380_j18.2aCRC(10dd4eaa),palette (Fluke: C605)
0x0020-0x011F256380_j17.7bCRC(13989357),character lookup table (Fluke: 648D)
0x0020-0x011F256380_j17.7bCRC(13989357),character lookup table (Fluke: 648D)
0x0120-0x021F256380_j16.10cCRC(c244f2aa),sprite lookup table (Fluke: A2BA)
0x0120-0x021F256380_j16.10cCRC(c244f2aa),sprite lookup table (Fluke: A2BA)
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