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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.
Space Tactics (Sega, 1981)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x2FFF12288ROM
0x4000-0x40FF256Mirror, RAM0x0700,
0x50001Mirror, Read Port0x0fff, IN0
0x0001Button 7Active Low
0x0002Button 6Active Low
0x0004Button 5Active Low
0x0008Button 4Active Low
0x0010Button 3Active Low
0x0020Start 1Active Low
0x0040Button 2Active Low
0x0080SpecialActive High
0x6000-0x60012Mirror, Write0x0f08, coinlockout_w
0x60001Mirror, Read Port0x0fff, IN1
0x00014C_1CActive High
0x00052C_1CActive High
0x00071C_1CActive High
0x00061C_2CActive High
0x00041C_3CActive High
0x00021C_4CActive High
0x00001C_5CActive High
0x00031C_6CActive High
0x00084C_1CActive High
0x00282C_1CActive High
0x00381C_1CActive High
0x00301C_2CActive High
0x00201C_3CActive High
0x00101C_4CActive High
0x00001C_5CActive High
0x00181C_6CActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x6002-0x60054Mirror, Write NOP0x0f08,
0x6006-0x60072Mirror, Write Only, Shared0x0f08, , paletteram
0x60161Mirror, Write Only, Shared0x0f08, , motor_on (/* Note: This overlaps rocket sound */)
0x6020-0x60278Mirror, Write Only, Shared0x0f08, , lamps
0x60301Mirror, Write0x0f0f, speed_latch_w
0x60401Mirror, Write0x0f0f, shot_trigger_w
0x60501Mirror, Write0x0f0f, shot_flag_clear_w
0x6060-0x606F16Mirror, Write Only, Shared0x0f00, , display_buffer
0x6070-0x609F48Mirror, Write NOP0x0f00,
0x60F0-0x60FF16Mirror, Write NOP0x0f00,
0x70001Mirror, Read Port0x0fff, IN2
0x0007SpecialActive High
0x0008SpecialActive High
0x0010Coin 1Active Low
0x0020Coin 2Active Low
0x0040OffActive High
0x0000OnActive High
0x8000-0x87FF2048Mirror, Write0x0800, scroll_ram_w
0x80001Mirror, Read Port0x0fff, IN3
0x0001Button 1Active Low
0x0002SpecialActive High
0x00044Active High
0x00006Active High
0x00081Active High
0x00002Active High
0x0010OffActive High
0x0000OnActive High
0x0020Joystick LeftActive Low
0x0040Joystick RightActive Low
0x0080SpecialActive High
0x90001Mirror, Read0x0fff, vert_pos_r
0xA0001Mirror, Read0x0fff, horiz_pos_r
0xB000-0xBFFF4096RAM, Sharedvideoram_b
0xC000-0xCFFF4096Read/Write NOP
0xD000-0xDFFF4096RAM, Sharedvideoram_d
0xE000-0xEFFF4096RAM, Sharedvideoram_e
0xF000-0xFFFF4096RAM, Sharedvideoram_f
 

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:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048epr-218xCRC(b1186ad2) (Fluke: CF0A)
0x0800-0x0FFF2048epr-219xCRC(3b86036d) (Fluke: B5AA)
0x1000-0x17FF2048epr-220xCRC(c58702da) (Fluke: 23EB)
0x1800-0x1FFF2048epr-221xCRC(e327639e) (Fluke: C7D3)
0x2000-0x27FF2048epr-222yCRC(24dd2bcc) (Fluke: A951)
0x2800-0x2FFF2048epr-223xCRC(7fef0940) (Fluke: B121)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048pr54CRC(9640bd6e),color/priority PROM (Fluke: 73A6)
0x0800-0x0FFF2048pr55CRC(f162673b),timing PROM (unused) (Fluke: E13E)
0x1000-0x101F32pr65CRC(a1506b9d),timing PROM (unused) (Fluke: DC42)
0x1020-0x103F32pr66CRC(78dcf300),timing PROM (unused) (Fluke: 95E8)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048epr-217CRC(38259f5f),LED fire beam data (Fluke: 1EFE)
0x0800-0x081F32pr67CRC(b27874e7),LED timing ROM (unused) (Fluke: A4CE)
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