Metroid/RAM map

The following article is a RAM map for Metroid.

RAM	Purpose
64	Jump State. 00=Unable to attempt jump. 01=Able to attempt jump.
70	Damage State. 00=Able to be damaged. 01-FF=Count down to 0, undamagable.
106	Energy Variable. High nybble contains the "ones" place of the amount of energy Samus currently has.
107	Energy Variable. Low nybble contains the "tens" place of the amount of energy Samus currently has. High nybble contains number of full tanks.
10E	Weapon selection: 00=Arm Cannon, 01=Missile. Set this to FF for lots of missiles! :)
200-2FF	Sprite DMA.
316	Horizontal movement in air. Keep below 3F to avoid graphical glitches. Keep at 2F and below (?) to avoid door entry glitches--such will cause you to exit two screen widths in the opposite direction you entered.
6877	Number of tanks collected. Keep to 6 or below to avoid redraw errors.
6878	Special items Samus is currently carrying. Contains an 8-bit value from 00 to FF (0 to 255). Each bit represents one of eight special items. Hex values are as follows: 1="Bombs", 2="Hi-Jump", 4="Long Beam", 8="Screw Attack", 10="Maru Mari", 20="Varia", 40="Wave Beam", 80="Ice Beam". For multiple weapons, add values in hex. (Ex: 16 for Maru Mari, Long Beam, and Hi-Jump.)
6879	The actual number of missiles that Samus is currently carrying. Contains an 8-bit value from 00 to FF (0 to 255).
687A	The maximum number of missiles that Samus may carry at any given time. Contains an 8-bit value from 00 to FF (0 to 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=Not wearing suit.