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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.
Astron Belt (Sega, 1983)
Memory Area:mainmem
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Bankbank1
0xC000-0xC7FF2048Read/Write, Sharedastron_OBJ_read, astron_OBJ_write, obj_ram (/* OBJ according to the schematics (sprite) */)
0xC800-0xCFFF2048Read/Writeastron_DISC_read, astron_DISC_write (/* DISC interface according to schematics */)
0xD0001Read PortDSWA (/* SW bank 2 (DIPs) */)
0x00f0Coin_AActive High
0x00e04C_1CActive High
0x00103C_1CActive High
0x00902C_1CActive High
0x00a02C/1C 4C/2C 5C/3C 6C/4CActive High
0x00202C/1C 4C/3CActive High
0x00f01C_1CActive High
0x00c01C/1C 2C/1C 3C/3C 4C/4C 5C/6CActive High
0x00401C/1C 2C/1C 3C/3C 4C/5CActive High
0x00801C/1C 2C/3CActive High
0x00602C_3CActive High
0x00701C_2CActive High
0x00001C/2C 2C/4C 3C/6C 4C/8C 5C/11CActive High
0x00b01C_3CActive High
0x00301C_4CActive High
0x00d01C_5CActive High
0x00501C_6CActive High
0x000fCoin_BActive High
0x000e4C_1CActive High
0x00013C_1CActive High
0x00092C_1CActive High
0x000a2C/1C 4C/2C 5C/3C 6C/4CActive High
0x00022C/1C 4C/3CActive High
0x000f1C_1CActive High
0x000c1C/1C 2C/1C 3C/3C 4C/4C 5C/6CActive High
0x00041C/1C 2C/1C 3C/3C 4C/5CActive High
0x00081C/1C 2C/3CActive High
0x00062C_3CActive High
0x00071C_2CActive High
0x00001C/2C 2C/4C 3C/6C 4C/8C 5C/11CActive High
0x000b1C_3CActive High
0x00031C_4CActive High
0x000d1C_5CActive High
0x00051C_6CActive High
0xD0011Read PortDSWB (/* SW bank 3 (DIPs) */)
0x0080Demo_SoundsActive High
0x0000OffActive High
0x0080OnActive High
0x006060 SECActive High
0x002050 SECActive High
0x004040 SECActive High
0x0000Infinite SECActive High
0x0010DifficultyActive High
0x0010NormalActive High
0x0000HardActive High
0x000c5000, 10000, 20000Active High
0x00045000, 20000, 40000Active High
0x000810000, 20000, 30000Active High
0x000010000, 20000, 40000Active High
0x0002Allow_ContinueActive High
0x0000OffActive High
0x0002OnActive High
0xD0021Read PortIN0 (/* SW bank 0 (IO) */)
0xD0031Read PortIN1 (/* SW bank 1 (IO) */)
0xD800-0xD8034Read/Write, Sharedastron_OUT_read, astron_OUT_write, out_ram (/* OUT according to schematics (output port) */)
0xE000-0xE1FF512Read/Write, Sharedastron_COLOR_read, astron_COLOR_write, color_ram (/* COLOR according to the schematics */)
0xF000-0xF7FF2048Write, Sharedastron_FIX_write, fix_ram (/* FIX according to schematics (characters) */)
0xF800-0xFFFF2048RAM(/* RAM according to schematics */)
Memory Area:mainport
Address RangeLengthFunctionDescription
0x0000-0x00012Writeastron_io_bankswitch_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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF20485280CRC(583af1ff) (Fluke: EBF2)
0x0000-0x07FF20485280CRC(583af1ff) (Fluke: EBF2)
0x0800-0x0FFF20485281CRC(7b5c820c) (Fluke: 6E1F)
0x0800-0x0FFF20485281CRC(7b5c820c) (Fluke: 6E1F)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF163845286CRC(8eb1c28e) (Fluke: 058B)
0x0000-0x3FFF163845286CRC(8eb1c28e) (Fluke: 058B)
0x8000-0xBFFF163845338CRC(94ca5f9a) (Fluke: 6B3E)
0x8000-0xBFFF163845338CRC(94ca5f9a) (Fluke: 6B3E)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF163845473cCRC(0f24baaa) (Fluke: A175)
0x4000-0x7FFF163845474aCRC(5d44603d) (Fluke: A0CB)
0x8000-0xBFFF163845284CRC(eec6db27) (Fluke: F489)
0x8000-0xBFFF163845284CRC(eec6db27) (Fluke: F489)
0xC000-0xFFFF163845285CRC(820e154e) (Fluke: 3F21)
0xC000-0xFFFF163845285CRC(820e154e) (Fluke: 3F21)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x01FF5125279CRC(8716aeb5) (Fluke: D84A)
0x0000-0x01FF5125279CRC(8716aeb5) (Fluke: D84A)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256pr-5278.binCRC(e81613da) (Fluke: 065B)
0x0000-0x00FF256pr-5278.binCRC(e81613da) (Fluke: 065B)
0x0100-0x01FF256pr-5277.binCRC(bf2c33ab) (Fluke: 8D6F)
0x0100-0x01FF256pr-5277.binCRC(bf2c33ab) (Fluke: 8D6F)
0x0200-0x021F32pr-5276.binCRC(91267e8a) (Fluke: A813)
0x0200-0x021F32pr-5276.binCRC(91267e8a) (Fluke: A813)
0x0220-0x023F32pr-5275.binCRC(0c872a9b) (Fluke: B57D)
0x0220-0x023F32pr-5275.binCRC(0c872a9b) (Fluke: B57D)
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