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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.
Sky Raider (Atari, 1978)
Memory Area:skyraid_map
Address RangeLengthFunctionDescription
0x0000-0x00FF256RAM, Mirror0x300
0x0400-0x040F16Write Only, Sharedpos_ram
0x0800-0x087F128RAM, Mirror, Shared0x480, alpha_num_ram
0x10001Readskyraid_port_0_r
0x10011Read PortDSW
0x000060 SecondsActive High
0x001080 SecondsActive High
0x0020100 SecondsActive High
0x0030120 SecondsActive High
0x0040OffActive High
0x0000OnActive High
0x0080NoActive High
0x0000YesActive High
0x14001Read PortCOIN
0x0000Mode 0Active High
0x0001Mode 1Active High
0x0002Mode 2Active High
0x0003Mode 3Active High
0x0004Mode 4Active High
0x0005Mode 5Active High
0x0006Mode 6Active High
0x0007Mode 7Active High
0x0008Mode 8Active High
0x0009Mode 9Active High
0x000aMode AActive High
0x000bMode BActive High
0x000cMode CActive High
0x000dMode DActive High
0x000eMode EActive High
0x000fMode FActive High
0x0000LowActive High
0x0010HighActive High
0x1400-0x14012Read PortSYSTEM
0x0020Hiscore ResetActive Low
0x1C00-0x1C0F16Write Only, Sharedobj_ram
0x40001Writeskyraid_scroll_w
0x44001Writeskyraid_sound_w
0x48001Writeskyraid_range_w
0x50001Device Writewatchdog, watchdog_timer_device, reset_w
0x58001Writeskyraid_offset_w
0x7000-0x7FFF4096ROM
0xF000-0xFFFF4096ROM
 

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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x01FF512030598.h2CRC(2a7c5fa0) (Fluke: 1C62)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048030599.m7CRC(0cd179ea) (Fluke: 0415)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x7000-0x77FF2048030595.e1CRC(c6cb3a2b) (Fluke: B035)
0x7800-0x7FFF2048030594.d1CRC(27979e96) (Fluke: 8853)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0200-0x02FF256006559.c4CRC(5a8d0e42),sync (Fluke: 9748)
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