The Little Mermaid/RAM map

The following article is a RAM map for The Little Mermaid.

RAM	Function	Details
0x0000 - 0x0001	Pointer address	Used to jump to specific section
0x0014	PAD1 new input	Input new to current frame
0x0015	PAD2 new input	Input new to current frame
0x0016	PAD1 input	All current input 0x80 = A 0x40 = B 0x20 = Select 0x10 = Start 0x08 = Up 0x04 = Down 0x02 = Left 0x01 = Right
0x0017	PAD2 input	All current input
0x0030	Ariel's current action	0x00 = Still/moving 0x01 = Turning 0x03 = Shooting bubble/throwing object 0x07 = Taking damage/dying 0x09 = Entering stage
0x0031	Ariel's direction of movement
0x003A	Object being held	# of object slot
0x003B	A button timer (bubbles/throw)
0x0050	Room info	0x80 = Scrolls upward 0x40 = Scrolls downward 0x00 = Scrolls horizontally 0x0F = Room #
0x0051	Size of current room
0x0052	Position in current room	256/240 pixel segments depending on horizontal or vertical scrolling
0x0092	Global timer
0X00B0	Lives
0X00B1	Health
0x00B4	Bubble power
0x00B5	Bubble range
0X00E4 - 0X00E7	RNG Seed	Fibonacci LFSR (Function 0xC250)
0x00E9	Current stage
0x00EF	Current object slot	Used in Function 0x8000 (Page 6)
0x00F7	Screen x-pos within current room segment
0x00F8	Screen y-pos within current room segment
0x00FA	Screen y-pos (high byte)	240 pixels per segment
0x00FB	Screen y-pos (low byte)	pixels
0x00FC	Screen x-pos (high byte)	256 pixels per segment
0x00FD	Screen x-pos (low byte)	pixels
0x0100 - 0x01BF	Stack
0x0300 - 0x030F	Object Phase	0x80 = slot occupied 0x0F = phase within script
0x0310 - 0x031F	Object ID	Determines object's behavior
0x0320 - 0x032F	y-position subpixel
0x0330 - 0x033F	x-position low byte (pixel)
0x0340 - 0x034F	x-position high byte
0x0350 - 0x035F	y-position subpixel
0x0360 - 0x036F	y-position low byte (pixel)
0x0370 - 0x037F	y-position high byte
0x0380 - 0x038F	x-speed low byte (subpixels/frame)
0x0390 - 0x039F	x-speed high byte (pixels/frame)
0x03A0 - 0x03AF	y-speed low byte (subpixels/frame)
0x03B0 - 0x03BF	y-speed high byte (pixels/frame)
0x03C0 - 0x03CF	Attributes	0x40 = damage hitbox active 0x20 = able to be bubbled
0x03D0 - 0x03DF	Direction of movement	Speed values above are scalar. They are used in conjunction with this value to determine velocity. 0x08 = up 0x04 = down 0x02 = right 0x01 = left
0x03F0 - 0x03FF	HP
0x0400 - 0x040F	Sprite orientation	0x40 = Horizontal flip (face left) 0x04 = invisible
0x0430 - 0x043F	Graphic ID	Determines object's animation loop
0x0460 - 0x046F	Counter 1	Use depends on object
0x0470 - 0x047F	Counter 2	Use depends on object
0x0480 - 0x048F	Counter 3	Use depends on object
0x0490 - 0x049F	Counter 4	Use depends on object
0x04A0 - 0x04AF	Stun timer	Actions/animation paused while nonzero
0x0620 - 0x063F	Current color palettes