Mega Man 6 (Raidenthequick's disassembly)

On a fresh A press with no slide, on ordinary floor, Mega Man 6's standing loop sets his vertical speed to $FA.$CC, 5.20 px/frame up, where Mega Man 5 writes 5 px/frame ($05.$00); in tile type $09 it writes the slower $FB.$CC instead (slow-surface). The air loop adds gravity before each move, so the first frame lifts him 0.25 less, 4.95 px. Measured in Mesen from power-on, standing where he lands at the start of Tomahawk Man's stage, the first frame of a jump moves him up at that 4.95 px/frame. mega-man-6/jump-speed

About: Mega Man 6 Jump

{
 "takeoff": 1332
}

The fraction $CC also marks him as airborne: the air loop runs while $05B1 isn't 0, and adding $40 (or $18) to $CC never reaches 0.

Cited by: Mega Man 6

Computed from the ordinary take-off and gravity, outside tile types $08 and $09 (fall-limits, slow-surface), a jump with A held peaks 51.6 px above the floor on its 20th frame. Measured in Mesen from power-on, at the start of Tomahawk Man's stage, the held jump rose 51.56 px and turned to fall after frame 20. mega-man-6/jump-peak

About: Mega Man 6 Jump

{
 "height": 51.5625,
 "frame": 20
}

Cited by: Mega Man 6

On a rising frame without A, Mega Man 6 sets the whole-pixel byte of his vertical speed to 0 and keeps its fraction, so he starts down at once at under 1 px/frame; Mega Man 5 sets both bytes to 0. Outside tile type $08 the cut waits until the rise is no faster than 5 px/frame ($05C8 at $FB or above), and it needs bits $0C of the fraction set, which they always are under the normal gravity, since the jump's $CC gains $40 a frame. Measured in Mesen from power-on at the start of Tomahawk Man's stage, with A let go after 3 frames, the 4th frame left him falling at 0.80 px/frame ($00.$CC). mega-man-6/release-cut

About: Mega Man 6 Variable jump height

{
 "afterRelease": 0
}

Under the normal gravity the speed is already $FB.$0C after the first frame, so the 5 px/frame test never blocks a cut from a jump; in tile type $08 the fraction steps by $18 and the bits test passes on every other frame (computed).

Cited by: Mega Man 6

Outside tile type $08, gravity adds $40 (0.25 px/frame) to Mega Man's vertical speed every frame before he moves. Measured in Mesen from power-on, at the start of Tomahawk Man's stage, his speed grew by 0.25 px/frame on each frame of a held jump. mega-man-6/gravity

About: Mega Man 6 Gravity

Value: 64 1/256 px/frame per frame

Cited by: Mega Man 6

In tile type $08 gravity is $18 a frame (0.09 px/frame) instead of $40. Falling, the whole-pixel byte of his speed stops at 7 while the fraction keeps growing, so under the normal gravity his top falling speed steps between 7.05 and 7.80 px/frame (computed). mega-man-6/fall-limits

About: Mega Man 6 Gravity

{
 "typeEight": 24,
 "maxFallWhole": 7
}

The atlas hasn't found which stages' tiles are type $08; the lighter gravity suggests water.

Cited by: Mega Man 6

From standing, a held direction moves Mega Man one frame at the walking speed, $01.$4C (1.30 px/frame) from the table at $8BEA, then holds him in the step pose while a counter of 6 ($95) runs out, and walks at 1.30 px/frame from the 7th frame. That is on ordinary floor: on surface type $05 he walks at once, on $15 he carries momentum at up to 2 px/frame (momentum-surfaces), and in tile type $09 he walks at 0.5 px/frame (slow-surface). Measured in Mesen from power-on, at the start of Tomahawk Man's stage, Right moved him 1.30 px on frame 1, not at all on frames 2 to 6, and 1.30 px on each frame after. mega-man-6/walk-start

About: Mega Man 6 Running

{
 "speed": 332,
 "stillFrames": 5
}

The surface type $A7 is the last non-zero tile type the move's first probe found ($38875A-$388761).

Cited by: Mega Man 6

In the air the d-pad sets his horizontal speed from the same table at $8BEA each frame, 1.30 px/frame or 0, and clears any carried momentum, except when his surface ($A7) is $15: then the air loop runs the momentum routine code_388B0F instead, and the carried speed stays (momentum-surfaces). On a ladder, Up or Down moves him along it at the same 1.30 px/frame. mega-man-6/air-and-ladder

About: Mega Man 6 Air control

Value: 332 1/256 px/frame

Cited by: Mega Man 6

Mega Man 6 keeps Mega Man 5's slide speed and length, 2.5 px/frame for 26 frames ($1A), set from the table at $8003, outside tile type $09, where the table at $8009 gives 1.5 px/frame (slow-surface). Measured in Mesen from power-on, at the start of Tomahawk Man's stage, a slide from Down and A moved him 2.5 px on each of 26 frames, 65 px in all. mega-man-6/slide-line

About: Mega Man 6 Ground slide

{
 "speed": 640,
 "frames": 26
}

Cited by: Mega Man 6

A press of A without Down ends Mega Man 6's slide but doesn't jump: the slide hands over to the standing loop, which looks for a jump only in a later frame's fresh press ($9A). In Mega Man 5 the same press jumps out of the slide when there is headroom. Measured in Mesen from power-on, at the start of Tomahawk Man's stage, an A press on a slide's 8th frame with Down let go ended the slide that frame, and A held for the next 6 frames left him on the floor. mega-man-6/slide-exit

About: Mega Man 6 Ground slide

Cited by: Mega Man (classic series), Mega Man 6

Down and A start the slide only with no Rush adaptor on ($9B 0); with one, the press jumps. A turn (a held direction against his facing) ends the slide early, and at its end two tile probes above him keep it going 4 frames at a time while the ceiling is low. mega-man-6/slide-rules

About: Mega Man 6 Ground slide

{
 "extend": 4
}

Cited by: Mega Man 6

On the ground Mega Man 6 runs one of three loops, each ending its frame with a yield and reading the next frame's input after it. Standing, a held direction turns him and starts the step: one move at the walking speed, then 5 frames still (walk-start); after it a held direction walks on, turning to it, and none stands him. Walking, letting go stands him on the same frame, and a held direction against his facing turns him at once and walks on with no new step. A fresh A press jumps from any of the three, before that frame's move, or slides with Down held, except on the frame a walk's direction is let go: that frame goes straight to the standing loop's move, and the press is lost. Down alone does nothing. mega-man-6/ground-loops

About: Mega Man 6 Running

On surface type $05 the standing loop skips the step and walks at once (momentum-surfaces). The step's 5 still frames run only the animation: no move and no gravity.

Each frame, after a loop's checks, Mega Man 6 makes one move through code_3886CE: on ordinary floor and in the air alike, the horizontal speed comes from the d-pad's table at $8BEA, 1.30 px/frame or 0; gravity is added to the vertical speed; he moves by both speeds in 8.8 fixed point; and the tile checks run after the move (collision-order). mega-man-6/frame-order

About: Mega Man 6 Running

The table's rows are indexed by $99: 0 for no direction, 1 for right ($01.$4C), 2 for left ($FE.$B4). Surface types $0A and $0C add a water drag first (code_388BA0).

A Mega Man 6 falling onto a floor has his vertical speed set to 0, fraction included, by the floor push (floor-snap). The air loop reads the landing on the next frame, from the fraction being 0, and goes into the walking loop at once: that frame he turns to a held direction and walks at 1.30 px/frame with no step, or a fresh A press jumps again. A press on the touchdown frame itself is never read, since only the air loop runs then, and it reads A only as held. mega-man-6/landing

About: Mega Man 6 Jump

With an adaptor on ($9B not 0), the landing waits up to 8 frames for input instead.

Walking or standing off a ledge, Mega Man 6 stays in his ground loop while the whole byte of his vertical speed is 0: gravity's 0.25 px/frame a frame moves him down 0.25, 0.5, 0.75, and 1 px on the first four frames over the gap, and through the 2nd to 4th a fresh A press still jumps. After the 4th the loop finds the whole byte at 1 and enters the air loop with the fraction set to $CC, so he falls at 2.05 px/frame the next frame. Measured in Mesen from power-on, walking right off the ledge at X 160 near the start of Tomahawk Man's stage, he fell 0.25, 0.5, 0.75, and 1 px in the walking state, then 2.05 px/frame in the air; a press of A on the 4th frame over the gap jumped at the full take-off speed, and one on the 5th didn't. mega-man-6/walk-off

About: Mega Man 6 Coyote time

{
 "groundFrames": 4,
 "fraction": 204
}

Over a gap the floor push never runs, so the fraction grows $40 a frame from the 0 it left on the floor, and the whole byte reaches 1 on the 4th frame. A slide ends sooner, on its 2nd frame over a gap (slide-handover). Mega Man 2 has no such frames (mega-man-2/no-coyote-time).

Mega Man 6 tests the tiles at points around his center, from the table at $9119 (X) and $912D (Y): falling or standing, his floor at 12 px below the center, at the center and 7 px to each side; rising, his head at 9 px above it, at the same three; and walls 7 px to the side he moves toward, at 7 px below the center (level with it when rising), 9 px above, and 10 px below. In a slide the high wall point and the head's two side points drop to 3 px above the center (the head's center point stays 9 above), and the low wall point to 12 below. Each point reads the 16 px tile holding it. mega-man-6/terrain-points

About: Mega Man 6 Hitbox

{
 "tile": 16,
 "side": 7,
 "floor": 12,
 "head": -9,
 "wall": {
  "down": 7,
  "up": 0,
  "high": -9,
  "low": 10
 },
 "slide": {
  "high": -3,
  "low": 12
 }
}

Counted in the rows and columns his body covers, both ends included: 15 columns, from x − 7 to x + 7, and 21 rows, from the head point's row (9 above the center) down to his feet, the row above the floor point (11 below), since the floor point lies in the floor's top row once he stands (floor-snap); in a slide, 15 rows, from the high wall point's row (3 above) to the feet. Counted to the floor point instead, the spans are 22 and 16 rows.

After each move Mega Man 6 tests his points in a fixed order: the center floor or head point, then the wall point at mid height, then, if he moves sideways, the high wall point, then the two floor or head corners, and last one more wall point, the low one if he moves sideways or the high one if not. A floor or ceiling found pushes him out at once, so the points after it test from where it left him; a wall found ends the frame's tests. mega-man-6/collision-order

About: Mega Man 6 Hitbox

Standing still, the side tested is the right one, since a speed of 0 counts as moving right.

When a floor or head point finds a solid tile, Mega Man 6 is pushed out of it by the point's depth in its 16 px tile: from the tile's top half up to the row above it, from its bottom half down to the row below it; his Y fraction stays. Falling or standing, his vertical speed is set to 0; rising, only its whole byte (ceiling-hit). After the frame's tests a push moves him 1 px back down, so a standing Mega Man's floor point lies in the floor's top row. Standing, gravity adds $40 to his speed and his Y every frame and the floor pushes him back, so his Y fraction drifts by $40 a frame while his whole Y stays. Measured in Mesen from power-on near the start of Tomahawk Man's stage, a walk, a slide, and a jump off the ledge at X 160 each landed with his floor point on the top row of the lower floor (row 160, 32 px below the start floor's top row, 128), the speed 0. mega-man-6/floor-snap

About: Mega Man 6 Hitbox

The drift shows in whole pixels only when he leaves the floor: a jump starts from wherever the fraction has got to.

Rising into a solid tile, Mega Man 6 is pushed down below it and 1 px further, and the whole byte of his vertical speed is set to 0 while its fraction stays, so on the next frame, gravity added, he moves down 0.30 to 1.05 px (under the normal gravity). He stays in the air loop, and the jump's release cut, which needs the whole byte negative, no longer applies. mega-man-6/ceiling-hit

About: Mega Man 6 Jump

Under the normal gravity the fraction left is one of $0C, $4C, $8C, $CC, since the jump's $CC gains $40 a frame; the next frame's gravity makes it $4C to $10C, a move of 0.30 to 1.05 px. The air loop keeps running because the fraction isn't 0 (landing).

When a wall point finds a solid tile, Mega Man 6 is pushed back out across by the point's depth in its 16 px tile, from its left half to the column left of it, from its right half to the column right of it; his X fraction stays, and the frame's other tile tests are skipped. The push also ends a slide. Measured in Mesen from power-on near the start of Tomahawk Man's stage, walking left on the lower floor into the face of the ledge at X 160 held his X at 167, his left wall points on column 160, right of the face, while he kept walking. mega-man-6/wall-stop

About: Mega Man 6 Hitbox

Pushing toward a wall, the point is in the tile's near half, so a push to the right lands him with the point one column inside the free space and a push to the left with it on the column just left of the tile.

Nothing in Mega Man 6's ground loops tests the ceiling before a jump or a slide: a fresh A press sets the take-off speed or starts the slide outright, and a jump under a low ceiling meets it on its first move (ceiling-hit). Mega Man 5 tests a point over his head before a slide starts. mega-man-6/jump-under-ceiling

About: Mega Man 6 Jump

A slide's end does test for a low ceiling (slide-rules).

Mega Man 6's slide ends on a turn, a wall (wall-stop), a fresh A without Down (slide-exit), its 26th frame, or the 2nd frame over a gap, when gravity has taken his speed's fraction to $41 or more. Unless a low ceiling keeps the slide going (slide-rules), it hands over in the same frame: over a gap to the air loop, with the fraction set to $CC, and otherwise to the standing loop, which moves him a second time that frame, at the walking speed toward a held direction or not at all. So a turn out of a slide moves him 2.5 px forward and 1.30 px back in one frame, and the next frame starts a step. Measured in Mesen from power-on near the start of Tomahawk Man's stage, a slide off the ledge at X 160 slid on its first frame over the gap and fell from the second, and Left on a rightward slide's 7th frame moved him 1.20 px right that frame ($01.$34, the slide's $02.$80 less the walk's $01.$4C), then 1.30 px left as a step began. mega-man-6/slide-handover

About: Mega Man 6 Ground slide

{
 "fallFraction": 65
}

The standing loop's move also adds gravity, so the frame a slide hands over adds it twice.

Mega Man 6's ordinary-floor movement isn't Mega Man 5's: the first difference is a jump's take-off. Mega Man 6 sets his vertical speed to $FA.$CC, 5.20 px/frame up; Mega Man 5 sets its whole byte $03F0 to $05 and its fraction $03D8 to $00, 5 px/frame (jump-speed). Letting go of A sets only the whole byte to 0 in Mega Man 6 and both bytes in Mega Man 5 (release-cut), and Mega Man 5 tests for headroom before a slide where Mega Man 6 doesn't (jump-under-ceiling). The two run different code: Mega Man 5's player is a state machine dispatched each frame from $30, Mega Man 6's a coroutine of loops (coroutine-scheduler). mega-man-6/movement-differs-from-mega-man-5

About: Mega Man 6 Jump

Mega Man 5's movement is Mega Man 4's (mega-man-5/jump-kept, mega-man-5/slide-kept), so the same differences stand between Mega Man 6 and Mega Man 4.

Cited by: Mega Man (classic series)

At the end of every frame Mega Man 6 holds Mega Man on the screen: his X is kept from 16 px ($A8, which his routine's start sets to $10) to 244 px right of the camera's left edge, with its fraction left as it is, and a Y of 240 or more on the screen's own rows kills him. Measured in Mesen from power-on near the start of Tomahawk Man's stage, where the camera can't scroll left, walking left stopped at X 16 while his X fraction kept changing. mega-man-6/screen-edges

About: Mega Man 6 Hitbox

The movement lab's model leaves the screen out; its ROM check keeps every script inside the open floor between X 16 and the ledge at X 160.

On tile type $09 ($064B) Mega Man moves slower: a jump starts at $FB.$CC (4.20 px/frame up), the slide at 1.5 px/frame, and walking at 0.5 px/frame, from the tables at $8009 and $8BF6. mega-man-6/slow-surface

About: Mega Man 6 Running

{
 "jump": 1076,
 "slide": 384,
 "walk": 128
}

Which stages' tiles are type $09 hasn't been traced.

Cited by: Mega Man 6

On surface types $05 and $15 his walking speed is a carried momentum ($A1.$A0). A held direction sets it to full speed at once, 1.30 px/frame on $05 and 2 px/frame on $15; with nothing held it slows by 6/256 px/frame each frame, and holding the other way slows it by 12/256 (computed), until its sign flips and it stops. mega-man-6/momentum-surfaces

About: Mega Man 6 Running

{
 "decay": 6,
 "reverse": 12
}

The slide's end (loc_70332) also sets the momentum to the walking speed, so he keeps sliding forward after it on these surfaces. Which stages use them hasn't been traced.

Cited by: Mega Man 6

Mega Man 6 keeps Mega Man 5's knockback: 0.5 px/frame against his facing, or 0.25 px/frame ($40) with the direction he faces held, here for 30 frames ($1E), with Up, Down, Start, and Select masked out of the held buttons. mega-man-6/knockback-kept

About: Mega Man 6 Knockback

{
 "back": 128,
 "resisted": 64,
 "frames": 30
}

Cited by: Mega Man 6

A hit sets Mega Man 6's invincibility timer $A2 to 60 frames ($3C), but the 30-frame knockback runs through the frame routine's entry past the countdown (code_388EB9), so the timer starts to count, and he starts to blink, only once the knockback ends: he can't be hurt for 90 frames in all (computed). The damage routine skips a hit while $A2 isn't 0. mega-man-6/i-frames

About: Mega Man 6 Invincibility frames

{
 "timer": 60,
 "total": 90
}

Cited by: Mega Man 6

Mega Man 6's buster fires a normal shot on the press of B, which sets the charge counter $9E to 0; each later frame with B held adds 1, and on release the counter fires a half-charged shot from 36 ($24) and a full one from 90 ($5A, kept in $06AB), and nothing under 36. Between games these are counts, not frames: Mega Man 5's counter, whose start isn't traced, fires its half charge from 40 and its full one from 80, and Mega Man 4's, which starts at 1 on the press, from 32 and 92. mega-man-6/charge-line

About: Mega Man 6 Charge shot

{
 "half": 36,
 "full": 90
}

The weapon routine runs once a frame in the standing, walking, air, slide, and ladder loops, so the counter counts frames there; the hurt routine zeroes it. If the press finds no free shot slot, the counter isn't zeroed.

Cited by: Mega Man 6

With the Power adaptor ($9B 2) the charge counter gains 2 a frame and caps at 60 ($3C), so a half-strength punch comes from 18 frames held and a full one from 30 (computed). Each punch (shot types $0C, $0E, $0F by tier) holds him in a 12-frame pose that keeps the charge off ($9E = $FF). mega-man-6/power-adaptor

About: Mega Man 6 Charge shot

{
 "perFrame": 2,
 "half": 36,
 "full": 60,
 "poseFrames": 12
}

The punch pose ends by zeroing $9E and returning him to the fall, the stand, or the ladder.

Cited by: Mega Man 6

With the Jet adaptor ($9B 1), holding A in the air while not rising and with jet energy left starts the jet. It slows his fall by 1/8 px/frame each frame until he would rise, holds him still for 10 frames, then lifts him from 2 px/frame, faster each frame, and holds him at 84 px ($54) above where he stopped; the d-pad steers him at 1 px/frame. Letting go of A, or running out of energy, drops him back into the fall. mega-man-6/jet-flight

About: Mega Man 6 Flight

{
 "ceiling": 84,
 "hover": 10,
 "steer": 256
}

In tile type $08 the rise is held at 1 px/frame ($388221-$38822F), and in tile type $0E it keeps its speed. A jump with A held all the way turns into the jet at its peak.

Cited by: Mega Man 6

The jet's energy $9C drains by 1 every 4 frames the jet runs, and the jet stops when it goes below 0, so a full meter of 20 steps (0 to 19) lasts 80 frames (computed). It refills by 1 every other frame up to 19, from empty in 40 frames (computed), while the jet's frame counter $9D is 0, which landing sets, and the buster is the weapon in hand. mega-man-6/jet-meter

About: Mega Man 6 Flight

{
 "steps": 20,
 "framesPerStep": 4,
 "refillFrames": 2
}

The ladder entry ($38835E) and the end of the knockback ($38851C) also zero $9D.

Cited by: Mega Man 6

Mega Man 6 runs its objects, Mega Man included, as coroutines. Each frame code_3FE41C counts the slots from 22 down to 0 and calls each live one at its resume address ($0413/$042A); a script yields by calling code_3FE468, which pops its own return address into that pointer and moves to the next slot, so the script resumes after the call the next frame. Mega Man's movement (slot 0) is written as loops around that call, each loop ending the frame through code_388E95. mega-man-6/coroutine-scheduler

About: Mega Man 6 Cooperative multitasking

Cited by: Mega Man 6