Metroid/RAM map

The following article is a RAM map for Metroid.

Given non-RAM address values: $Hexadecimal value(Decimal value), ex. $63(99)

Any values less than $0A(10) will only show the Hex value.

RAM	Function	Details
$0049	Scroll direction	0=top, 1=bottom, 2=left, 3=right, updates onscroll only
$004F	Vertical page	Denotes vertical page in the loaded map. Not sure about offset. It's also changing when you change direction. Does not update when $00FC is 0, but does when higher.
$0050	Horizontal page	This denotes the horizontal page in the current loaded map. I'm not sure about the offset. It's also changing when you change direction. Does not update when $00FD is 0, but does when higher.
$0051	Samus' x position on screen
$0052	Samus' y position on screen
$00FC	Vertical page offset. Page y number + offset gives you mapcoords of top.
$00FD	Horizontal page offset. Page x number + offset gives you mapcoords of left.
$0064	Jump State	$00=Unable to jump, $01=Able to jump
$0070	Temporary Invulnerability	$00=Damageable, $01-$FF(255)=Count down to 0, undamageable
$0106	Samus' Energy (Byte 1)	High nybble contains the "ones" place of the amount of energy Samus currently has.
$0107	Samus' Energy (Byte 2)	Low nybble contains the "tens" place of the amount of energy Samus currently has. High nybble contains number of full tanks.
$010E	Weapon selection	$00=Arm Cannon, $01=Missles
$0200-02FF	Sprite DMA
$0316	Horizontal movement in air	Keep below $3F(63) to avoid graphical glitches. Keep at $2F(47) and below (?) to avoid door entry glitches--such will cause you to exit two screen widths in the opposite direction you entered.
$0400/6F	Enemy data 1	There is space for 6 enemies. Screen XY is saved here, as well as HP. This is only part of the data. Some of it is kept in the SRAM and some of it is unknown.
$6877	Number of tanks collected. Keep to $06 or below to avoid redraw errors.
$6878	Special items Samus is currently carrying	Each bit represents one of eight special items. Hex values are as follows: Hex Decimal Item $01 1 Bombs $02 2 Hi-Jump $04 4 Long Beam $08 8 Screw Attack $10 16 Maru Mari $20 32 Varia $40 64 Wave Beam $80 128 Ice Beam For multiple weapons, add values in hex. (Ex: $16(22) for Maru Mari, Long Beam, and Hi-Jump)
$6879	The current number of missiles that Samus is carrying	$00-$FF(255)
$687A	The maximum number of missiles that Samus may carry	$00-$FF(255)
$687B	Kraid defeated/statue	$00=Kraid alive, $01=Kraid dead/Statue ready to be raised, $02-7F=Kraid dead/Statue unraisable,$80-FF=Kraid dead/Statue raised
$687C	Ridley defeated/statue	$00=Ridley alive, $01=Ridley dead/Statue ready to be raised, $02-7F=Ridley dead/Statue unraisable, $80-FF=Ridley dead/Statue raised
$69B3	Suit state	$00=Wearing suit, $01-$FF(255)=Not wearing suit
$6B14	Enemy data 2	Some more enemy data. Tells enemy type, sprite table, whether it's drawn and other stuff. This list does NOT seem to be synced with Enemy data 1.