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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.
Gyruss (Konami, 1983)
Memory Area:audio_cpu1_io_map
Address RangeLengthFunctionDescription
0x00001Device Writeay1, ay8910_device, address_w
0x00011Device Readay1, ay8910_device, data_r
0x00021Device Writeay1, ay8910_device, data_w
0x00041Device Writeay2, ay8910_device, address_w
0x00051Device Readay2, ay8910_device, data_r
0x00061Device Writeay2, ay8910_device, data_w
0x00081Device Writeay3, ay8910_device, address_w
0x00091Device Readay3, ay8910_device, data_r
0x000A1Device Writeay3, ay8910_device, data_w
0x000C1Device Writeay4, ay8910_device, address_w
0x000D1Device Readay4, ay8910_device, data_r
0x000E1Device Writeay4, ay8910_device, data_w
0x00101Device Writeay5, ay8910_device, address_w
0x00111Device Readay5, ay8910_device, data_r
0x00121Device Writeay5, ay8910_device, data_w
0x00141Writegyruss_i8039_irq_w
0x00181Device Writesoundlatch2, generic_latch_8_device, write
Memory Area:audio_cpu1_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x6000-0x63FF1024RAM
0x80001Device Readsoundlatch, generic_latch_8_device, read
Memory Area:audio_cpu2_io_map
Address RangeLengthFunctionDescription
0x0000-0x00FF256Device Readsoundlatch2, generic_latch_8_device, read
0x00001Writegyruss_irq_clear_w
0x00001Writegyruss_dac_w
Memory Area:audio_cpu2_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096ROM
Memory Area:main_cpu1_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x83FF1024RAM, Sharedcolorram
0x8400-0x87FF1024RAM, Sharedvideoram
0x9000-0x9FFF4096RAM
0xA000-0xA7FF2048RAM, Sharedshare1
0xC0001Read Port, Write NOPDSW2, (/* watchdog reset */)
0x0003LivesActive High
0x00033Active High
0x00024Active High
0x00015Active High
0x0000255 (Cheat)Active High
0x0004CabinetActive High
0x0000UprightActive High
0x0004CocktailActive High
0x0008Bonus_LifeActive High
0x000830k 90k 60k+Active High
0x000040k 110k 70k+Active High
0x0070DifficultyActive High
0x00701 (Easiest)Active High
0x00602Active High
0x00503Active High
0x00404Active High
0x00305 (Average)Active High
0x00206Active High
0x00107Active High
0x00008 (Hardest)Active High
0x0080Demo_SoundsActive High
0x0080OffActive High
0x0000OnActive High
0xC0801Read Port, WriteSYSTEM, gyruss_sh_irqtrigger_w
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008Start 1Active Low
0x0010Start 2Active Low
0x00e0UnusedActive Low
0xC0A01Read PortP1
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnusedActive Low
0x0080UnusedActive Low
0xC0C01Read PortP2
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnusedActive Low
0x0080UnusedActive Low
0xC0E01Read PortDSW1
0xC1001Read Port, Device WriteDSW3, soundlatch, generic_latch_8_device, write
0x0001OffActive High
0x0000OnActive High
0x00feUnusedActive Low
0xC1801Writemaster_nmi_mask_w
0xC1851Write Only, Sharedflipscreen
Memory Area:main_cpu2_map
Address RangeLengthFunctionDescription
0x00001Readgyruss_scanline_r
0x20001Write, Read NOPslave_irq_mask_w,
0x4000-0x403F64RAM
0x4040-0x40FF192RAM Write, Sharedgyruss_spriteram_w, spriteram
0x4100-0x47FF1792RAM
0x6000-0x67FF2048RAM, Sharedshare1
0xE000-0xFFFF8192ROM
 

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:audio2
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096gyrussk.3aCRC(3f9b5dea) (Fluke: 9585)
Memory Area:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192gyrussk.1aCRC(f4ae1c17) (Fluke: 0173)
0x2000-0x3FFF8192gyrussk.2aCRC(ba498115) (Fluke: 9918)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192gyrussk.6CRC(c949db10) (Fluke: 8E4F)
0x2000-0x3FFF8192gyrussk.5CRC(4f22411a) (Fluke: 2DB6)
0x4000-0x5FFF8192gyrussk.8CRC(47cd1fbc) (Fluke: CFCF)
0x6000-0x7FFF8192gyrussk.7CRC(8e8d388c) (Fluke: BB97)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192gyrussk.4CRC(27d8329b) (Fluke: B59A)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192gyrussk.1CRC(c673b43d) (Fluke: CC33)
0x2000-0x3FFF8192gyrussk.2CRC(a4ec03e4) (Fluke: 9AB6)
0x4000-0x5FFF8192gyrussk.3CRC(27454a98) (Fluke: 468B)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32gyrussk.pr3CRC(98782db3),palette (Fluke: 9C42)
0x0020-0x011F256gyrussk.pr1CRC(7ed057de),sprite lookup table (Fluke: 7853)
0x0120-0x021F256gyrussk.pr2CRC(de823a81),character lookup table (Fluke: E75B)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0xE000-0xFFFF8192gyrussk.9CRC(822bf27e) (Fluke: 2A5F)
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