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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.
Hexion (Konami, 1992)
Memory Area:hexion_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x9FFF8192ROM Bankbank1
0xA000-0xBFFF8192RAM
0xC000-0xDFFE8191Read/Writebankedram_r, bankedram_w
0xDFFF1Writebankctrl_w
0xE0001Read/Write NOP
0xE800-0xE87F128Device Read/Writek051649, k051649_device, k051649_waveform_r, k051649_waveform_w
0xE880-0xE88910Device Writek051649, k051649_device, k051649_frequency_w
0xE88A-0xE88E5Device Writek051649, k051649_device, k051649_volume_w
0xE88F1Device Writek051649, k051649_device, k051649_keyonoff_w
0xE8E0-0xE8FF32Device Read/Writek051649, k051649_device, k051649_test_r, k051649_test_w
0xF000-0xF00F16Device Read/Writek053252, k053252_device, read, write
0xF2001Device Writeoki, okim6295_device, write
0xF4001Read PortDSW1
0xF4011Read PortDSW2
0x000fUnusedActive Low
0x0070DifficultyActive High
0x0070EasiestActive High
0x0060Very_EasyActive High
0x0050EasyActive High
0x0040MediumActive High
0x0030Medium_HardActive High
0x0020HardActive High
0x0010Very_HardActive High
0x0000HardestActive High
0x0080Demo_SoundsActive High
0x0080OffActive High
0x0000OnActive High
0xF4021Read PortP1
0xF4031Read PortP2
0xF4401Read PortDSW3
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x00faUnusedActive Low
0xF4411Read PortSYSTEM
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008SpecialActive High
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xF4801Writebankswitch_w
0xF4C01Writecoincntr_w
0xF5001Writegfxrom_select_w
0xF5401Device Readwatchdog, watchdog_timer_device, reset_r
 

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
0x0000-0x3FFFF262144122a07.1hCRC(22ae55e3),Later pcbs have mask roms labeled: "KONAMI // 055066 // 122A07 // 233505" @1H (maybe mismarked 2H on pcb?) (Fluke: 8D25)
0x40000-0x7FFFF262144122a06.1gCRC(438f4388),Later pcbs have mask roms labeled: "KONAMI // 055065 // 122A06 // 233506" @1G (Fluke: F747)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072122__j_a__b01.16fCRC(eabc6dd1),"122 // J A // B01" @16F (27c010?) (Fluke: 38E1)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144122a05.2fCRC(bcc831bf),Later pcbs have mask roms labeled: "KONAMI // 055064 // 122A05 // 233507" @2F (maybe 2G? marking isn't visible in the picture I have) (Fluke: BAAC)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256122a04.10bCRC(506eb8c6) (Fluke: 580F)
0x0100-0x01FF256122a03.11bCRC(590c4f64) (Fluke: FD43)
0x0200-0x02FF256122a02.13bCRC(5734305c) (Fluke: B60E)
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