Castlevania (NES, Famicom Disk System)/RAM map

The following article is a RAM map for Castlevania (NES, Famicom Disk System).

This page is rather stubbly and could use some expansion. Are you a bad enough dude to rescue this article?

RAM	Function	Details
0x0004	RNG	Changes seemingly randomly.
0x0007	Title Bat Current sprite	May be used by something else.
0x0018	Mode	$00 = Start game $01 = Title Screen $02 = Demo $04 = Intro Animation $05 = Playing $06 = Dead $08 = Door Animation $0A = Entering Castle Animation $0C = Crystal ball $0D = Game Over $0F = End Credits
0x0019	Sub-mode	The values vary with mode.
0x001A	Timer	Increments by 1 each frame. Resets each time you "change stage?"
0x001E	Title Screen timer (time until demo mode)	Counts slowly (each 8 frames) up to $11 (until castle bat becomes close), then (each frame) down from $FF to $00.
0x0022	Paused	$01 = yes, $00 = no
0x0028	Current Stage
0x002A	Number of Lives
0x002B	Full Game Loops	$00 = Normal Mode (first game loop), $01 and above = Difficult Mode
0x002E	Camera's X position
0x003E	Is Simon on stairs	$00 = yes, $01 = no
0x003F	Simon's Y position (in level)
0x0040	Simon's X position (in level)
0x0041	High byte of Simon's X position (in level)
0x0042	1's and 10's place of Time in BCD
0x0043	100's and 1000's place of Time in BCD
0x0044	Life Meter (Graphic)	2 bars = +$08, Max = $40(64)
0x0045	Life Meter (Actual)	2 bars = +$08, Max = $40(64)
0x0046	Substage	Either $00 or $01 since each stage has at most 2 substages. (The substage changes when crossing a vertical screen transition, namely by taking stairs.)
0x005B	Simon's iframes	When nonzero, Simon blinks with invulnerability and this byte counts down. Set to $30 after landing from knockback.
0x005F	Kneeling	$00 = standing, $01 = kneeling
0x0064	Subweapon Shot	$00 = single shot, $01 = double shot, $02 = triple shot
0x0070	Whip length	Set to $00, $01, or $02.
0x0071	Number of Hearts	$00 to $63 (99 in decimal).
0x008X	Pulse 1 channel	Values determining how the sound plays. 0x00X0 = length of note remaining 0x00X1 = something to do with note octaves? 0x00X3 = note ID? 0x00X5 $X0 = note pulse width (C?, E or F) 0x00X7 $0X = note volume (3 to 0) 0x00XA = something to do with note octaves? 0x00XB = length of note remaining (but at note attack, starts at $02 more than 0x00X0 and decreases by $02/frame for 2 frames instead of $01/frame)
0x009X	Pulse 2 channel	Ditto.
0x00AX	Triangle channel	'
0x00BX	Noise channel	'
0x00F5	Player 1 Controller (Press)	Like 0x00F7 except only stores the buttons which were just pressed this frame.
0x00F7	Player 1 Controller (Held)	Similar to Metroid's 0x0014. The buttons currently held down. $80: jump $40: attack $20: select $10: start $08: up $04: down $02: left $01: right
0x0159	Simon's current image (unknown use : dosen't seem to affect gameplay)	$00=standing, $01-03 = walk, $04 = jump and crouch, $05-07 = whip/sub-weapon, $0D-0E = walk up stairs, $0F-10 = walk down stairs, $12 = hurt $1C = dead $1D = collapsing
0x015B	Subweapon	$00 = no subweapon $08 = Dagger $09 = Boomerang $0B = Holy Water $0D = Axe $0F = Stopwatch
0x0160	Simon's screen position (in room)
0x0162	Simon's screen position (in room)	not 0x0160.
0x038C	Simon's X position (in screen)
0x0390	Enemy 1's X position (in screen)
0x0391	Enemy 2's X position (in screen)
0x0392	Enemy 3's X position (in screen)
0x0393	Boss 1?'s X position (in screen)
0x0395	Bat/Medusa Head 1's X position (in screen)
0x0396	Bat/Medusa Head 2's X position (in screen)
0x0397	Bat/Medusa Head 3/Drac's Top Fireball's X position (in screen)
0x0398	Bat/Medusa Head 4/Drac's Middle Fireball's X position (in screen)
0x0399	Bat/Medusa Head 5/Drac's Bottom Fireball's X position (in screen)
0x03A0	Sub-weapon 1's X position (in screen)
0x03A1	Sub-weapon 2's X position (in screen)
0x03A3	Platform 1's X position (in screen)
0x03A4	Platform 2's X position (in screen)
0x0450	Direction Simon looks	$00 = right, $01 = left
0x046c	Simon's state	$00 = standing/walking, $01 = jumping, $02 = attacking, $03 = crouching, $04 = stairs, $05 = knockback, $06 = walk-to-stair, $07 = dropping, $08 = dead, $09 = stunned
0x0491-0494?	Projectile Animation Timers?	In a similar area than Candle Animation Timers. Appears to activate around projectile-firing enemies.
0x0496-049B	Candle Animation Timers	Count down from $08 to $00. When Item is out, from $0F to $00 except when item is static, in which case it stays $80. Freezes when item is picked up.
0x04A4	Number of steps taken
0x04B2	Candle 1's current image	Oscillates from $01 to $02.
0x04B3	Candle 2's current image	Ditto
0x04B4	Candle 3's current image	'
0x04B5	Candle 4's current image	'
0x04B6	Candle 5's current image	'
0x04B7	Candle 6's current image	'
0x04DC	Simon's vertical speed magnitude	Ranges from 8F to A4 during a normal jump, reaching A4 at the crest. Used to look up the speed in pixels-per-frame from a table.
0x0514	Simon's vertical speed direction	$00 = up, $01 = down.
0x054C	Simon's hit-stun timer	Must be 0 except during knockback or stun, or else the game glitches up.
0x0584	Simon's sub-state	Bits 0 and 1 are for horizontal motion: $00 = not moving, $01 = moving right, $02 = moving left Other bits: $04 = crouching $40 = attacking $80 = jumping
0x07FC	Ones/Tenths of points	In pseudo Decimal (Ex.: $08, $09, $10...)
0x07FD	Hundreds/Thousands of points	Ditto.
0x07FE	Ten Thousands/Hundred Thousands of points	'
0x6000-7FFF	RNG 2	Strangely, these 8192 values are all equal to the same thing.