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IREM M92

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