Dragon Quest III (SNES)/RAM map

The following article is a RAM map for Dragon Quest III (SNES).

Main

Category	Address	Size	Description
Joypad	$7e7ff8	word	Joypad Buttons - registers $4218 and $4219 are read and stored here

VBLANK State Machine

The whole graphics state is set every VBLANK interrupt. This is also where VRAM DMA transfers are scheduled.

Category	Address	Size	Description
Graphics Settings	$7e7f8a	byte	$2101 - OAM object size and object base
Graphics Settings	$7e7f8c	byte	$2105 - BG mode and BG character size
Graphics Settings	$7e7f8e	byte	$2106 - Mosaic size and mosaic enable
Graphics Settings	$7e7f90	byte	$2107 - BG 1 screen base and screen size
Graphics Settings	$7e7f92	byte	$2108 - BG 2 screen base and screen size
Graphics Settings	$7e7f94	byte	$2109 - BG 3 screen base and screen size
Graphics Settings	$7e7f96	byte	$210a - BG 4 screen base and screen size
Graphics Settings	$7e7f98	byte	$210b - BG 1 & 2 tile base addresses
Graphics Settings	$7e7f9a	byte	$210c - BG 3 & 4 tile base addresses
Graphics Settings	$7e7fba	byte	$2123 - Window mask setting, BG 1 & 2
Graphics Settings	$7e7fbc	byte	$2124 - Window mask setting, BG 3 & 4
Graphics Settings	$7e7fbe	byte	$2125 - Window mask setting, OBJ
Graphics Settings	$7e7fc0	byte	$2126 - Window 1 left position
Graphics Settings	$7e7fc1	byte	$2127 - Window 1 right position
Graphics Settings	$7e7fc2	byte	$2128 - Window 2 left position
Graphics Settings	$7e7fc3	byte	$2129 - Window 2 right position
Graphics Settings	$7e7fc4	byte	$212a - Window 1/2 mask logic, BG 1-4
Graphics Settings	$7e7fc6	byte	$212b - Window 1/2 mask logic, MATH and OBJ
Graphics Settings	$7e7fc8	byte	$212c - Main screen designation
Graphics Settings	$7e7fca	byte	$212d - Sub screen designation
Graphics Settings	$7e7fcc	byte	$212e - Window area main screen disable
Graphics Settings	$7e7fce	byte	$212f - Window area sub screen disable
Graphics Settings	$7e7fd0	byte	$2130 - Color math control A
Graphics Settings	$7e7fd2	byte	$2131 - Color math control B
Graphics Settings	$7e7fd4	word	$2132 - Color math sub screen backdrop color, RGB intensities stored as 0bbbbbgggggrrrrr
Graphics Settings	$7e7fda	byte	$2133 - Screen mode/video select
Graphics Loading	$7e8bae - $7e8dad	$100 words	$4302 - DMA source addresses
Graphics Loading	$7e8dae - $7e8fad	$100 words but only uses low byte	$4304 - DMA source address banks
Graphics Loading	$7e8fae - $7e91ad	$100 words	$2116 - VRAM destination addresses
Graphics Loading	$7e91ae - $7e93ad	$100 words	$4305 - DMA transfer sizes
Graphics Loading	$7e93ae	byte	Number of DMA transfers to perform (indexes the preceding arrays)
Graphics Loading	$7faeea - $7fb0e9	$100 words	Tile indexes, which tiles to copy, used to fill the DMA copy scheduler data in $7e8bae - $7e93ae