User:lelegofrog/Sandbox

the dumping grounds for ideas

wip smas ram map (dunno if i'll ever finish) taken from SMW Central

RAM Map

Super Mario Bros. 1

Address    Size    Description
-------    ----    -----------
7E0000        8    Scratch RAM for many subroutines
7E0008        1    Unused scratch RAM
7E0009        1    Frame Counter
7E000A        3    Player action data.
                   Note that these flags are not mirrors of SNES controller flags.
                   They merely signify which states the player is experiencing.
                   For example, the Jump flag can be set by whatever button maps to jumping.
                   Also, the flag is set only by the controller of the current player.
                   ------
                   7E000A
                   Bit flags: JD000000
                   J - Jump button
                   D - Dash button
                   ------
                   7E000B
                   Bit flags: 0000UD00
                   U - Up button
                   D - Down button
                   ------
                   7E000C
                   Bit flags: 000000LR
                   L - Left flag
                   R - Right flag
7E000D        1    Saves the value of $7E:000A (jump/run flags) from the previous frame.
7E000F        1    Player's current action
                   (Entering pipe, fade to image before level, vine, etc.)
                   TODO: verify "Number of subroutines to run in game engine on next frame"
7E0010        8    Sprite onscreen flags
                   Bit 7 = never overwrite sprite slot of current index.
                   Bit 0 = Onscreen flag.