Final Fantasy VI (everything8215's disassembly)

Each combatant's ATB gauge constant is (speed + 20) times 1.5 times a haste, normal, or slow constant of 84, 64, or 32, over 16; for monsters the speed term is first scaled by 255 − 24 × the battle speed setting, over 255, so the setting slows only the monsters. Every 2 frames UpdateBattleTime adds each present combatant's constant to its gauge, and a gauge that overflows gives that combatant a turn. It skips the update only when wait mode is on and the battle-time-stopped flag is also set, since it ANDs the two. ff6/atb-gauge

About: Final Fantasy VI Active Time Battle

{
 "speedPlus": 20,
 "haste": 84,
 "normal": 64,
 "slow": 32,
 "framesPerUpdate": 2,
 "battleSpeedStep": 24
}

Cited by: Final Fantasy VI, Turn order

Unless the target has Image, which a physical attack instead tests with a random byte under $40 (a miss that may remove the Image), an attack that can miss hits when a roll of 0–99 is under its hit rate times the target's stored evade, over 256, where the stored value is 256 − 2 × the evade % (255 for 0). The branch meant to pick Evade for a physical attack tests a carry flag that the check before it has cleared, so every such attack is checked against the target's magic evade (MBlock) and skips the Blind and status adjustments; the disassembly carries a BUGFIX_EVADE option, credited to Terii Senshi, that restores Evade. ff6/hit-check

About: Final Fantasy VI Hit chance

Cited by: Final Fantasy VI, Hit chance

CalcDmgMod multiplies the damage by a random variance and then by 255 − the target's Defense (Magic Defense for a magic attack), each over 256 plus 1. The variance is a random byte ORed with $E0, so 224–255; the routine's comment says 240–255. ff6/damage-mod

About: Final Fantasy VI Damage formula

{
 "varianceMin": 224,
 "varianceMax": 255,
 "defenseFrom": 255
}

Cited by: Damage formula

Unless an attack is set to always crit, it is critical when a random byte is under 8, a 1-in-32 chance, and a critical adds 2 to the damage multiplier, which the code comments as damage ×2. ff6/critical

About: Final Fantasy VI Critical hit

{
 "chance": 8,
 "of": 256
}

Cited by: Critical hit, Final Fantasy VI

A damage element that the target absorbs turns the damage into healing; one it nullifies makes the damage 0; one it halves halves it; one it is weak to doubles it, unless the damage is already 32,768 or more. The checks run in that order and the first match applies. ff6/elements

About: Final Fantasy VI Elemental weakness

{
 "absorb": -1,
 "nullify": 0,
 "halve": 0.5,
 "weak": 2
}

Cited by: Elemental weakness

While the characters are trying to run away, each character's run counter gains a random 1 to their run factor each time their status counter overflows, and the character escapes when the counter reaches the run difficulty. The difficulty is 2 for each monster present, or 6 for one marked harder to run from; a monster marked can't-escape, or a pincer attack, forbids running. ff6/run

About: Final Fantasy VI Fleeing

{
 "perMonster": 2,
 "perHarderMonster": 6
}

Cited by: Fleeing

Each step on a town or dungeon map adds the map's rate to a random-battle counter ($70 per step at the normal rate; $40, $160, or $200 at the low, high, and very high ones; the Charm Bangle halves them and the Moogle Charm zeroes them), and a battle starts when a byte from the random table, plus an offset that grows by 17 each time its pointer wraps, is under the counter's high byte. A battle clears the counter, so each step without one makes the next likelier. ff6/encounter-rate

About: Final Fantasy VI Random encounter

{
 "normal": 112,
 "low": 64,
 "high": 352,
 "veryHigh": 512,
 "charmBangleFactor": 0.5
}

Cited by: Random encounter

On the world map, the sector that picks the battle rate and group is read from $1F60 and $1F61. While the player walks, the world map's movement code copies the current position there only in the branch taken after a random battle starts, so the rate and group stay as they were until a battle or another writer (world map start, events, entrances) updates them; the disassembly marks this as a bug. ff6/world-map-sector-bug

About: Final Fantasy VI Random encounter

Cited by: Random encounter

Final Fantasy V counts each combatant's ATB timer down by one per tick from 120 + weight ÷ 8 − agility; Final Fantasy VI instead adds a constant built from speed to a gauge every 2 frames and gives the turn when the gauge overflows. ff6/atb-changes-ff5

About: Final Fantasy VI Active Time Battle

Cited by: Active Time Battle, Final Fantasy V, Final Fantasy VI

Final Fantasy VI keeps Final Fantasy V's random-battle counter, which each step raises by the map's rate and which a byte from the random table, offset each time its pointer wraps, is tested against; it halves the normal rate from $E0 to $70 per step and changes the high one from $180 to $160. ff6/encounter-keeps-ff5

About: Final Fantasy VI Random encounter

Cited by: Final Fantasy V, Final Fantasy VI, Random encounter

In Final Fantasy V only three weapon attack types roll for a critical (fists, katanas, and type 36), at the crit % the attack type carries; in Final Fantasy VI an attack that can crit does so on a random byte under 8, 1 in 32, whatever the weapon. ff6/critical-changes-ff5

About: Final Fantasy VI Critical hit

Cited by: Critical hit, Final Fantasy V