Castlevania III - Dracula's Curse (USA), read through vinheim3's disassembly and the ROM

Dracula's Curse keeps Castlevania's jump for every character but Grant; the take-off starts the arc at entry 9 of a longer table whose entries from there are Castlevania's 20 rises, 5, 5, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 0, 1, 0, 0, 0, and 0 px, and the 8 entries before it, 6 then 5 px, carry a fall below the take-off height down to 6 px/frame, where Castlevania falls at 8 px/frame once its table runs out. draculas-curse/jump-table

About: Castlevania III: Dracula's Curse Jump

{
 "start": 9,
 "steps": [
  5,
  5,
  3,
  3,
  3,
  3,
  3,
  2,
  2,
  2,
  1,
  1,
  1,
  1,
  0,
  1,
  0,
  0,
  0,
  0
 ],
 "before": [
  6,
  6,
  6,
  6,
  6,
  5,
  5,
  5
 ],
 "maxFall": 6
}

The disassembly names the state "exceptGrant"; Grant's state table points at a jump of his own (grant-jump). Index 0 is $80, 1-5 are $FA, and 6-10 are $FB, so entry 9 is the fourth $FB and the rise is the 20 entries 9 to 28. Not measured.

Cited by: Castlevania, Castlevania III: Dracula's Curse, Gravity, Jump, Variable jump height

In Dracula's Curse the take-off shared by every character but Grant (the state tables the disassembly labels Trevor's, Sypha's, and Alucard's all point at it; Grant's has its own) sets the horizontal speed to 1 px/frame toward a held Left or Right, or 0, as in Castlevania. draculas-curse/air-direction

About: Castlevania III: Dracula's Curse Air control

Value: 1 px/frame

The jumping state shares its code with the falling state (playerState0c_falling_exceptGrant), whose button reads are B and Up; the atlas hasn't traced every routine it calls for a Left or Right read.

Cited by: Air control, Castlevania III: Dracula's Curse

In the air, a held Left or Right sets Grant's horizontal speed to 1 px/frame that way and turns him; with neither held the code leaves the speed as it was, so he keeps moving, until a wall stops him. draculas-curse/grant-air

About: Castlevania III: Dracula's Curse Air control

Value: 1 px/frame

Not measured. A standing jump stays vertical until a direction is pressed.

Cited by: Air control, Castlevania III: Dracula's Curse, Partner character

Grant's jump reads its own table from entry 30, one entry a frame while A is held; once A is up during the rise, or once he falls, the routine moves two entries a frame, so letting go shortens the rise, from 58 px held to the top to 30 px with A up on the first frame, by the table. draculas-curse/grant-jump

About: Castlevania III: Dracula's Curse Variable jump height

{
 "start": 30,
 "held": 58,
 "released": 30
}

Not measured. From entry 30 the held rise is 5 + 4×5 + 3×6 + 2×5 + 1×5 = 58 px; with A up from the first frame it reads entries 30, 32, … 56, 30 px. A fractional index accumulator stays at 0 here. The fall reads every other entry and then holds at 7 px/frame.

Cited by: Castlevania III: Dracula's Curse, Partner character, Variable jump height

Dracula's Curse turns a hit into a launch, where Castlevania steps a second table; the character is given 2 px/frame up and 1 px/frame sideways and faces opposite to that push (facing left with +1 speed when $90 is nonzero, else facing right with −1), and the hurt state adds 0.125 px/frame² of gravity each frame up to a 5 px/frame fall. draculas-curse/knockback

About: Castlevania III: Dracula's Curse Knockback

{
 "up": 2,
 "back": 1,
 "gravity": 0.125,
 "maxFall": 5
}

Which side $90 records hasn't been traced; by Castlevania's rule it would push the character away from the enemy. Not measured.

Cited by: Castlevania III: Dracula's Curse, Knockback

A hit in Dracula's Curse sets $80 to 120, which the player's update counts down once a frame while flickering the character; one branch of the hit handling returns at once while $80, or $AD, is nonzero. draculas-curse/i-frames

About: Castlevania III: Dracula's Curse Invincibility frames

Value: 120 frames

Reading $80 as invincibility is an interpretation. The early return at L257-L259 is reached only when $81 AND $F0 is nonzero; contact codes $0D and $0E are handled before it, and $AD also gates it. $80 is set to 120 in two places in the hit code (L298 and L326). Not measured.

Cited by: Castlevania III: Dracula's Curse, Invincibility frames

Dracula's Curse keeps two character slots; a swap flips the slot index with XOR 1 and loads that slot's character, one of four ids, Trevor, Sypha, Grant, and Alucard. draculas-curse/partners

About: Castlevania III: Dracula's Curse Partner character

The atlas hasn't traced which button starts the swap, or what fills each slot.

Cited by: Partner character

Dracula's Curse prices its subweapons from one table of eleven entries, nine at 1 heart, one at 5, and one at 0; a use compares the heart count with the price, and a thrown one subtracts it in BCD. draculas-curse/hearts

About: Castlevania III: Dracula's Curse Weapon energy

[
 1,
 1,
 1,
 1,
 1,
 1,
 1,
 1,
 1,
 0,
 5
]

The disassembly names only subweapon 3, the dagger, so the 5-heart and free entries aren't named here.

Cited by: Castlevania III: Dracula's Curse, Weapon energy

Dracula's Curse moves a character on stairs in steps; each step sets the speed to 0.5 px/frame across and 0.5 px/frame up or down the stairs, and the climbing state counts 15 frames before the step ends. draculas-curse/stairs

About: Castlevania III: Dracula's Curse Stairs

{
 "speed": 0.5,
 "frames": 15
}

15 frames at 0.5 px/frame is 7.5 px on each axis; whether the step's end frame moves too, making 8, hasn't been measured.

Cited by: Castlevania III: Dracula's Curse, Stairs