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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.
Markham (Sun Electronics, 1983)
Memory Area:markham_master_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0xC000-0xC7FF2048RAM
0xC800-0xCFFF2048RAM, Sharedspriteram
0xD000-0xD7FF2048RAM Write, Sharedmarkham_videoram_w, videoram
0xD800-0xDFFF2048RAM, Sharedshare1
0xE0001Read PortDSW2
0x0003Bonus_LifeActive High
0x0000NoneActive High
0x000120000Active High
0x000220000, Every 50000Active High
0x000320000, Every 80000Active High
0x0004Demo_SoundsActive High
0x0000OffActive High
0x0004OnActive High
0x0000OffActive High
0x0080OnActive High
0xE0011Read PortDSW1
0x0001LivesActive High
0x00003Active High
0x00015Active High
0x0002CabinetActive High
0x0002UprightActive High
0x0000CocktailActive High
0x0004Flip_ScreenActive High
0x0000OffActive High
0x0004OnActive High
0x0000IndividualActive High
0x0008CommonActive High
0x00001C 1C / 1C 1CActive High
0x00102C 1C / 2C 1CActive High
0x00202C 1C / 1C 3CActive High
0x00301C 1C / 1C 2CActive High
0x00401C 1C / 1C 3CActive High
0x00501C 1C / 1C 4CActive High
0x00601C 1C / 1C 5CActive High
0x00701C 1C / 1C 6CActive High
0x00801C 2C / 1C 2CActive High
0x00901C 2C / 1C 4CActive High
0x00a01C 2C / 1C 5CActive High
0x00b01C 2C / 1C 10CActive High
0x00c01C 2C / 1C 11CActive High
0x00d01C 2C / 1C 12CActive High
0x00e01C 2C / 1C 6CActive High
0x00f0Free_PlayActive High
0xE0021Read PortP1
0x0080UnknownActive High
0x0040UnknownActive High
0x0020Button 2Active High
0x0010Button 1Active High
0x0008Joystick DownActive High
0x0004Joystick UpActive High
0x0002Joystick LeftActive High
0x0001Joystick RightActive High
0xE0031Read PortP2
0x0080UnknownActive High
0x0040UnknownActive High
0x0020Button 2Active High
0x0010Button 1Active High
0x0008Joystick DownActive High
0x0004Joystick UpActive High
0x0002Joystick LeftActive High
0x0001Joystick RightActive High
0xE0041Readmarkham_e004_r (/* from CPU2 busack */)
0xE0051Read PortSYSTEM
0x0080Service 1Active High
0x0040UnknownActive High
0x0020UnknownActive High
0x0008Start 2Active High
0x0004Start 1Active High
0x0002Coin 2Active High
0x0001Coin 1Active High
0xE0081Write NOP(/* coin counter? */)
0xE0091Write NOP(/* to CPU2 busreq */)
0xE00C-0xE00D2Write Only, Sharedxscroll
0xE00E1Writemarkham_flipscreen_w
Memory Area:markham_slave_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0x8000-0x87FF2048RAM, Sharedshare1
0xC0001Device Writesn1, sn76496_device, write
0xC0011Device Writesn2, sn76496_device, write
0xC0021Write NOP(/* unknown */)
0xC0031Write NOP(/* unknown */)
 

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
0x0000-0x1FFF8192tvg6.84CRC(ab933ae5) (Fluke: EDA2)
0x2000-0x3FFF8192tvg7.85CRC(ce8edda7) (Fluke: F68D)
0x4000-0x5FFF8192tvg8.86CRC(74d1536a) (Fluke: D3D5)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192tvg9.87CRC(42168675) (Fluke: DE10)
0x2000-0x3FFF8192tvg10.88CRC(fa9feb67) (Fluke: EB54)
0x4000-0x5FFF8192tvg11.89CRC(71f3dd49) (Fluke: BDF4)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192tv3.9CRC(59391637) (Fluke: EF3D)
0x2000-0x3FFF8192tvg4.10CRC(1837bcce) (Fluke: 1473)
0x4000-0x5FFF8192tvg5.11CRC(651da602) (Fluke: 8A59)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF25614-3.99CRC(89d09126),R (Fluke: 9A6D)
0x0100-0x01FF25614-4.100CRC(e1cafe6c),G (Fluke: 50BD)
0x0200-0x02FF25614-5.101CRC(2d444fa6),B (Fluke: 65F1)
0x0300-0x04FF51214-1.61CRC(3ad8306d),sprite (Fluke: 3242)
0x0500-0x06FF51214-2.115CRC(12a4f1ff),bg (Fluke: 7119)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192tvg1.5CRC(c5299766) (Fluke: B064)
0x4000-0x5FFF8192tvg2.6CRC(b216300a) (Fluke: E014)
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