Castlevania (USA) (Rev 1), the rules the later games are compared with, read in the ROM

When an enemy touches Simon and there's room above him, Castlevania turns him to face the enemy, points his arc at a second, shorter table, and puts him in a hurt state that moves him away from the enemy with the walking move routine while it steps that table; the table rises 3, 3, 2, 1, 1, 1, 1, 1, 0, and 1 px, then holds for 7 steps, 14 px in all. castlevania-line/knockback

About: Castlevania Knockback

Value

[
 3,
 3,
 2,
 1,
 1,
 1,
 1,
 1,
 0,
 1,
 0,
 0,
 0,
 0,
 0,
 0,
 0
]

CodeCastlevania (USA) (Rev 1) · 0x1E744-0x1E74B — bank 7 $E734-$E73B, the contact code the Castlevania-Labelled-Disassembly labels BumpIntoEnemy: play the hurt sound, then call $FC97Castlevania (USA) (Rev 1) · 0x1FCA7-0x1FCB1 — bank 7 $FC97-$FCA1, which switches to bank 6 and calls $96C1Castlevania (USA) (Rev 1) · 0x196E1-0x1972C — bank 6 $96D1-$971C: the take-off's ceiling test ($9998), then the arc pointer from $9BA5, rising, state 5; facing $0450 = 1 (left) unless the enemy's X is at or right of Simon's; direction $3C = (facing + 1) XOR 3, the other wayCastlevania (USA) (Rev 1) · 0x19BB5-0x19BC9 — bank 6 $9BA5-$9BB9, the pointer ($9BA8), a $80 start marker, 17 signed steps ($FD = −3, up), and a $81 turn markerCastlevania (USA) (Rev 1) · 0x1937C-0x19387 — bank 6 $936C-$9377, the state table's first six entries; state 5 runs $965BCastlevania (USA) (Rev 1) · 0x1966B-0x196A0 — bank 6 $965B-$9690, state 5: a short count, then each frame $970B (direction away from the facing), the move routine $989A, and the arc routine $9B1EChecked by claude, 2026-10-21 — disassembled each range in the pinned ROM; the Castlevania-Labelled-Disassembly's labels led from BumpIntoEnemy to $96C1, and its listing matches Rev 1's bytes there

Not measured. The jump's table is 20 steps and 36 px (castlevania/jump-table); this one is the arc routine's second table, so the hit is a small hop with the jump's fall back down.

Cited by: Castlevania

In Castlevania a subweapon throw needs hearts; each of the four subweapons the double and triple shots multiply costs 1 heart and a free slot, the fifth, which starts a 15-count timer instead of a projectile, costs 5, and with 0 hearts nothing is thrown. castlevania-line/hearts

About: Castlevania Weapon energy

Value

{
 "projectile": 1,
 "timer": 5
}

CodeCastlevania (USA) (Rev 1) · 0x1FA36-0x1FA71 — bank 7 $FA26-$FA61, ShootSubweapon in the Castlevania-Labelled-Disassembly: no throw with hearts ($71) at 0; weapon index = CurrentWeapon − 8; index 2 sets a timer $015D = 15; the others with a 1 in the table at $FA62 call $DA44Castlevania (USA) (Rev 1) · 0x1DA54-0x1DA6E — bank 7 $DA44-$DA5E: find a free object slot (as many as the multiplier allows), then hearts − 1Castlevania (USA) (Rev 1) · 0x1DA8B-0x1DA9F — bank 7 $DA7B-$DA8F, index 2's entry in the $DA5F jump table: hearts − 5, or no use if that goes negativeCastlevania (USA) (Rev 1) · 0x1E811-0x1E823 — bank 7 $E801-$E813, MultiplierAcquired: the multiplier counts only for weapons $08, $09, $0B, and $0D (indices 0, 1, 3, 5)Checked by claude, 2026-10-21 — disassembled each range in the pinned ROM after following the Castlevania-Labelled-Disassembly's labels (ShootSubweapon, NumberofHearts, CurrentWeapon, MultiplierAcquired)

The code doesn't name the weapons, and the atlas hasn't read what the timer at $015D does. Indices 4, 6, and 7 take other paths.

Cited by: Castlevania, Weapon energy

In Castlevania the routine that picks a dropped bonus gives a whip upgrade only while no other special item is out, and only while Simon holds at least 4 hearts with the first whip or at least 8 with the second; otherwise it drops a small random bonus. Picking one up raises the whip level by 1. castlevania-line/whip-drop

About: Castlevania Whip upgrade

Value

{
 "level1At": 4,
 "level2At": 8
}

CodeCastlevania (USA) (Rev 1) · 0x1EBD3-0x1EBFE — bank 7 $EBC3-$EBEE: hearts ≥ 8 and whip level ($70) < 2, or hearts 4–7 and level < 1, spawn bonus type 3 (SpawnWhipUpgrade); else type 0 or 1 by a random bitCastlevania (USA) (Rev 1) · 0x1E89E-0x1E8B4 — bank 7 $E88E-$E8A4, WhipAcquired, which ends with inc $70Checked by claude, 2026-10-21 — disassembled both ranges in the pinned ROM after the Castlevania-Labelled-Disassembly's labels (SpawnSomething, SpawnWhipUpgrade, WhipAcquired, WhipLength012)

The routine runs when an object yields a random bonus; the atlas hasn't listed which objects call it.

Cited by: Castlevania, Whip upgrade