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IREM M92 HARDWARE
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HARDWARE DESCRIPTION
CPU : V33 @ 9 MHz, V30 @ 7.159090 MHz
Sound Chip : YM2151 @ 3.579545 MHz, GA20 @ 3.579545 MHz
Other Chip : GA21, GA22

Notes : The M92 is made from a top and bottom board, the top (main) board is common across the games, but the bottom (game) board can vary game to game.
The sound cpu and the sprite chip are on the game board rather than the main board and can differ between games, see individual games for details.
Each game has an encrypted sound cpu.
Hardware Abilitys : 3 scrolling playfields, 512 by 512.
Each playfield can enable rowscroll, change shape (to 1024 by 512), be enabled/disabled and change position in VRAM.

Tiles can have several priority values:
0 = standard
1 = Top 8 pens appear over sprites (split tilemap)
2 = Whole tile appears over sprites
3 = ? Seems to be the whole tile is over sprites (as 2).

Sprites have 2 priority values:
0 = standard
1 = Sprite appears over all tiles, including high priority pf1

Raster interrupts can be triggered at any line of the screen redraw, typically used in games like R-Type Leo to multiplex the top playfield.
Emulators : MAME


KNOWN IREM M92 GAME LIST
Blade Master / Cross Blades!
Dream Soccer 94
Gunforce
Gunforce 2 / Geostorm
Hook
In The Hunt / Kaitei Daisensou
Lethal Thunder / Thunder Blaster
Major Title 2 / The Irem Skins Game
Mystic Riders / Gun Hohki
Ninja Baseball Batman / Yakyuu Kakutou League-Man
Perfect Soldiers / Superior Soldiers
R-Type Leo
Undercover Cops


Blade Master / Cross Blades!
1991
Blade Master / Cross Blades! Blade Master / Cross Blades!
Notes : The ! in the cross blade title looks like a scimitar
Flyers : Normal Flyer - Cross Blades Flyer
 

Dream Soccer 94
1994
Board Revision : M92-G
Sound Program Revision : Rev 3.53 M92
Dream Soccer 94 Dream Soccer 94
 

Gunforce
1991
Board Revision : M92-A
Gunforce Gunforce
Flyers : Normal Flyer - Japan Flyer
Magazine reviews : SU Aug '91
Sequel : Gunforce 2 / Geostorm (1994)
 

Gunforce 2 / Geostorm
1994
Board Revision : M92-G
Sound Program Revision : Rev 3.53 M92
Gunforce 2 / Geostorm Gunforce 2 / Geostorm
Gunforce 2 / Geostorm Gunforce 2 / Geostorm
Flyers : Normal Flyer
Pictures : Kit
Prequel : Gunforce (1991)
 

Hook
1992
Sound Program Revision : Rev 3.45 M92
Hook Hook
Flyers : Normal Flyer
Pictures : Kit
 

In The Hunt / Kaitei Daisensou
1993
Board Revision : M92-E
Sound Program Revision : Rev 3.45 M92
In The Hunt / Kaitei Daisensou In The Hunt / Kaitei Daisensou
In The Hunt / Kaitei Daisensou In The Hunt / Kaitei Daisensou
Flyers : Normal Flyer - Alternate Flyer
 

Lethal Thunder / Thunder Blaster
1991
Hardware Notes : Has a memory card
Lethal Thunder / Thunder Blaster Lethal Thunder / Thunder Blaster
Lethal Thunder / Thunder Blaster Lethal Thunder / Thunder Blaster
Flyers : Japan Flyer - Misspelled Japan Flyer
 

Major Title 2 / The Irem Skins Game
1992
Board Revision : M92-F
Sound Program Revision : Rev 3.44 M92
Major Title 2 / The Irem Skins Game Major Title 2 / The Irem Skins Game
Major Title 2 / The Irem Skins Game Major Title 2 / The Irem Skins Game
Notes : Skins Game was available as a ticket dispensing machine as well.
Flyers : Normal Flyer - Skins Game Flyer
Magazine reviews : SU Mar '93
Prequel : Major Title (1990)
 

Mystic Riders / Gun Hohki
1992
Sound Program Revision : Rev 3.44 M92
Mystic Riders / Gun Hohki Mystic Riders / Gun Hohki
Mystic Riders / Gun Hohki Mystic Riders / Gun Hohki
Flyers : Normal Flyer
Magazine reviews : SU Aug '92
 

Ninja Baseball Batman / Yakyuu Kakutou League-Man
1993
Sound Program Revision : Rev 3.50 M92
Ninja Baseball Batman / Yakyuu Kakutou League-Man Ninja Baseball Batman / Yakyuu Kakutou League-Man
Ninja Baseball Batman / Yakyuu Kakutou League-Man Ninja Baseball Batman / Yakyuu Kakutou League-Man
Flyers : Normal Flyer - Japan Flyer
 

Perfect Soldiers / Superior Soldiers
1993
Board Revision : M92-G
Sound Program Revision : Rev 3.50 M92
Perfect Soldiers / Superior Soldiers Perfect Soldiers / Superior Soldiers
Perfect Soldiers / Superior Soldiers Perfect Soldiers / Superior Soldiers
Flyers : Normal Flyer - Alternate Flyer - Japan Flyer
 

R-Type Leo
1992
Sound Program Revision : Rev 3.45 M92
Hardware Notes : Has a memory card
R-Type Leo R-Type Leo
Flyers : Japan Flyer
Prequels : R-Type (1987) - R-Type II (1989) - R-Type II (1989)
 

Undercover Cops
1992
Sound Program Revision : Rev 3.40 M92
Undercover Cops Undercover Cops
Flyers : Normal Flyer - Alternate Flyer
Pictures : Kit
Magazine reviews : SU Aug '92 - C+VG Aug '92
 

 

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