Mega Man 5 (plasticsmoke ca65 disassembly)

Mega Man 5 keeps Mega Man 4's jump. Both write 5 px/frame ($05.$00) into the vertical speed at $03F0/$03D8 on a jump, and set it to 0 on any rising frame without A. mega-man-5/jump-kept

About: Mega Man 5 Variable jump height

{
 "takeoff": 1280,
 "afterRelease": 0
}

In Gravity Man's stage, with $AF set, the jump is $FB (5 px/frame the other way, at $80B5) and the cut tests the opposite sign (L330-L334).

Cited by: Jump, Mega Man 5, Variable jump height

Mega Man 5 keeps Mega Man 4's slide, 2.5 px/frame for 26 frames ($1A), with a jump out of it on any slide frame a fresh A press comes without Down and there is headroom. The earliest is the slide's 3rd frame, counting the set-up frame (Down and A) as the 1st: a fresh press needs A let go on the 2nd. mega-man-5/slide-kept

About: Mega Man 5 Ground slide

{
 "speed": 640,
 "frames": 26,
 "jumpFromFrame": 3
}

This set once gave the jump-out from frame 1 and Mega Man 4's from frame 2: the same rule counted from different frames. Mega Man 4's set-up runs its A test too, but Down is held then, so in both games the earliest jump-out is the 3rd frame (mega-man-4/slide-line). Mega Man 5 also starts the Charge Kick from this set-up when that weapon is selected ($8102-$811A), spending 1 unit of its energy per slide.

Cited by: Ground slide, Mega Man 5

One routine, entity_gravity_collide, moves Mega Man vertically in the ground, air, and slide states, before their horizontal move. By the sign of his speed's whole byte (8.8 fixed point, positive up) it moves him down or up by the speed, takes gravity off the speed, and only then tests the floor points under a fall or the ceiling points over a rise. The ground state runs the whole air routine first and reads A and the d-pad only if that routine found him standing and he was already on the ground. mega-man-5/motion-order

About: Mega Man 5 Gravity

With $AF set (Gravity Man's flipped gravity) the routine takes another path (LE872), which the model leaves out. The game's Y runs down the screen, so a move by an upward speed subtracts it.

Gravity takes 0.25 px/frame ($40/256) off Mega Man's upward speed every frame, after the move: the reset code writes $40 to $A1, and the gravity routine subtracts $A1 from the speed's fraction byte with the borrow into its whole byte. mega-man-5/gravity

About: Mega Man 5 Gravity

Value: 64 1/256 px/frame²

$52 skips gravity for the player (slot 0) while it is set; the water splash sets it, so in water gravity runs on fewer frames. The model leaves water out.

When gravity takes Mega Man's speed below −7 px/frame (its whole byte under $F9), the gravity routine sets it to exactly $F9.$00, so he falls at most 7 px a frame. mega-man-5/fall-cap

About: Mega Man 5 Gravity

Value: 7 px/frame

On the ground Mega Man's vertical speed rests at −1 px/frame ($FF.$00): a floor found under a fall snaps him onto it and entity_stop_y sets that speed. So each grounded frame moves him 1 px down, takes gravity, and tests his floor points; ground there puts him back with the same speed, and none leaves him in the air falling at 1.25 px/frame. mega-man-5/ground-check

About: Mega Man 5 Gravity

Value: -256 1/256 px/frame

When a falling Mega Man's floor points find a solid tile, LEEF7 subtracts the tested row's depth into its 16 px tile from his Y pixel, which puts the points on the tile's top row and his feet on its top, and keeps the Y fraction. A fall of up to 7 px a frame always ends on the top of the tile it reaches. mega-man-5/floor-snap

About: Mega Man 5 Gravity

The kept fraction carries a stage start's into every landing (start-fraction), and a slide's end adds $40 to it (slide-exit).

Mega Man's position is his center. Standing, walking, and in the air his floor points are 12 px below it at x−7, x, and x+7; his ceiling points 10 px above it at x−7 and x+7; and his wall points 8 px to the side he moves toward, at 9 px above, level with, and 11 px below his center. Tiles are 16 px. mega-man-5/terrain-box

About: Mega Man 5 Hitbox

{
 "tile": 16,
 "floor": {
  "dy": 12,
  "dx": [
   -7,
   0,
   7
  ]
 },
 "ceiling": {
  "dy": -10,
  "dx": [
   -7,
   7
  ]
 },
 "wall": {
  "dx": 8,
  "dy": [
   -9,
   0,
   11
  ]
 }
}

When the horizontal move puts a wall point in a solid tile, the move routine pushes Mega Man back by the point's depth into that 16 px tile, so x+8 ends on the wall's first column moving right and x−8 on the first column past it moving left. The X fraction, his speed, and his pose stay, so he walks in place against it. mega-man-5/wall-stop

About: Mega Man 5 Hitbox

Because the ground state runs the air routine before it moves him, Mega Man walks one frame past the edge before he falls: the frame whose move takes all three floor points off a ledge still counts as grounded, and on the next the floor test finds nothing after a 1 px drop, so the air routine puts him in the air state falling at 1.25 px/frame and moves him by the air's rules that frame. A press on that frame or any later one in the fall doesn't jump, since only the ground state reads A, after the air routine reports him standing. mega-man-5/walk-off

About: Mega Man 5 Coyote time

When a rising Mega Man's move puts a ceiling point, x−7 or x+7 at 10 px above his center, in a solid tile, LEEDD adds 15 minus the point's depth into the tile to his Y pixel, which leaves the point on the tile's bottom row, and entity_stop_y sets his speed to −1 px/frame; he stays in the air and falls from the next frame. mega-man-5/ceiling-hit

About: Mega Man 5 Hitbox

Value: -256 1/256 px/frame

Mega Man 4's snap sets the carry (one more pixel), but its ceiling points are 9 px above his center, not 10 (movement-differs-from-mega-man-4), so his center ends at the same height in both.

Nothing tests the ceiling before a jump starts: a fresh A press on the ground sets the jump speed and runs the air routine again, whose rise is the first test. So under a block two tiles over the floor, the lowest he can walk under, the jump still starts, and its 3rd frame meets the block: his ceiling points must rise 11 px to reach its bottom row, and the rise is 5, then 4.75, then 4.5 px (9.75 px after two frames, 14.25 after three). mega-man-5/jump-under-ceiling

About: Mega Man 5 Jump

Mega Man walks and moves through the air at the speed held in his X speed ($03C0.$03A8), 1.30 px/frame ($01.$4C) on ordinary floor; no walking or air code sets it. The slide writes 2.5 px/frame there, and its end and the jump out of it write $01.$4C back. Measured in Mesen from power-on at the start of Stone Man's stage ($26 = 2), the X speed read $01.$4C and each walking frame moved him 332/256 px. mega-man-5/walk-speed

About: Mega Man 5 Running

Value: 332 1/256 px/frame

Mega Man 4 walks at the same speed, from the same $01.$4C (mega-man-4/walk-speed).

On the ground Mega Man's sprite sub-type decides whether he moves. Standing ($01), a held direction sets the step pose ($0D) and moves him one frame; in the step pose he doesn't move, whatever the d-pad does, until its animation leaves its first frame, and then walks ($04) toward a held direction or stands with none. Walking, the same direction keeps him moving; letting go puts him in the step pose without a move, and the other direction puts him in it with one move that way. mega-man-5/ground-states

About: Mega Man 5 Running

The model leaves out the shooting poses (B) and platforms.

The step pose lasts 6 frames: its animation (sub-type $0D, descriptor $01,$05 at $BB28 in bank $13) holds its first frame until its tick count, reset with the sub-type, reaches 5. So from standing, or on a turn, a held direction moves Mega Man on the first frame, holds him still on the next 5, and walks from the 7th; letting go of a walk holds him 6 frames, whatever the d-pad does, before he stands or walks on. Measured in Mesen from power-on at the start of Stone Man's stage. mega-man-5/ground-measured

About: Mega Man 5 Running

{
 "pauseFrames": 6
}

Mega Man 4's pause is the same 6 frames (mega-man-4/ground-measured).

Every frame in the air the d-pad alone sets where Mega Man moves: the air routine copies the held Left or Right into his direction and moves him by his X speed that way, 1.30 px/frame, and with neither held he doesn't move. He turns at once, and nothing carries over from the ground. mega-man-5/air-speed

About: Mega Man 5 Air control

The frame a falling Mega Man's floor test finds ground puts him in the ground state with the walking pose ($04) and still moves him by the air's rules. On the next frame he walks on at once if he holds the direction he held on landing; any other direction, or none, starts the step pose. The air state reads no A press, so a press on the landing frame is lost, and the next frame's press jumps. mega-man-5/landing

About: Mega Man 5 Jump

Measured in Mesen from power-on, at the start of Stone Man's stage, Mega Man stood with his Y fraction at $80 once the teleport landed him. The floor snap keeps the fraction (floor-snap), so it stays with him on flat ground until a slide's end adds to it. mega-man-5/start-fraction

About: Mega Man 5 Gravity

Value: 128 1/256 px

The lab's model starts with this fraction, so its floor snaps and a slide's end match the cartridge's pixel for pixel. Scratch runs at the other seven Robot Master stage starts also read $80; no probe keeps those.

Down and a fresh A press start a slide only if the slide's start point, 15 px ahead of his center and 4 px below it, isn't in a wall; with a wall there the press does nothing, neither slide nor jump. The slide moves his Y pixel 2 px down and tests a lower, wider box: floor points 10 px below the new center at x−14, x, and x+14; ceiling points 8 px above it at the same three; and wall points 15 px ahead, 5 px above it and 9 px below. Its stand-up and jump-out test his headroom at three points 14 px above the slide's center (12 px above his standing one) at x−14, x, and x+14. mega-man-5/slide-box

About: Mega Man 5 Ground slide

{
 "lower": 2,
 "floor": {
  "dy": 10,
  "dx": [
   -14,
   0,
   14
  ]
 },
 "ceiling": {
  "dy": -8,
  "dx": [
   -14,
   0,
   14
  ]
 },
 "wall": {
  "dx": 15,
  "dy": [
   -5,
   9
  ]
 },
 "start": {
  "dx": 15,
  "dy": 4
 },
 "headroom": {
  "dy": -14,
  "dx": [
   -14,
   0,
   14
  ]
 }
}

Mega Man 4's slide has the same start point, floor, and headroom, but its wall points are level with his center and 9 px below, and its ceiling points level with it (movement-differs-from-mega-man-4).

A slide ends at the standing test, which a wall, the timer's end, or a turn sends it to. A turn (a held direction against the slide's) zeroes the timer and still moves him 2.5 px the new way on that frame. The test checks his headroom (slide-box): a solid tile there keeps him sliding at 2.5 px/frame, tested again every frame; a clear one raises him the 2 px back, puts him in the ground state with the walking pose and walking speed, and sets his vertical speed to −0.25 px/frame ($FF.$C0), so the next frame's fall moves his Y fraction $40 down before the floor snap. A slide off a ledge ends at once in the ground state without the 2 px back, at the same −0.25. mega-man-5/slide-exit

About: Mega Man 5 Ground slide

{
 "endSpeed": -64
}

Mega Man 4's stand-up leaves his center 2 px low and sets −1 px/frame, so the next frame's floor snap raises him (movement-differs-from-mega-man-4); its slide off a ledge keeps sliding while something is overhead.

Mega Man 5's ordinary-floor movement differs from Mega Man 4's, though the walk, the step pose, the jump, gravity, the fall cap, air control, and the slide's speed, length, and start are the same. The first difference on flat ground: on a slide's last frame Mega Man 5 raises his center the 2 px the slide lowered it and sets −0.25 px/frame, where Mega Man 4 leaves it 2 px low at −1 px/frame, so for that frame Mega Man 5 stands 2 px higher, and each of its slides adds $40 to his Y fraction. Against blocks, Mega Man 5's ceiling points are 10 px above his center (Mega Man 4's 9) and his wall points 9 px above it (Mega Man 4's 8); its slide's wall points are 5 px above and 9 px below the slide's center (Mega Man 4's level and 9 below), and its slide's ceiling points 8 px above it (Mega Man 4's level with it). mega-man-5/movement-differs-from-mega-man-4

About: Mega Man 5 Ground slide

Mega Man 4's ceiling snap adds one more pixel than Mega Man 5's (mega-man-code-lineage), which its ceiling points' extra pixel cancels: after a bump both centers rest at the same height, but Mega Man 5 meets a block one pixel sooner. Mega Man 4's slide also probes overhead when it runs off a ledge, and keeps sliding under a ceiling.

Cited by: Mega Man (classic series)

Mega Man 5 moves Mega Man 4's charge thresholds. On release its counter $38 fires a normal shot from 16 ($10), a half-charged one from 40 ($28), and a full one from 80 ($50), and nothing under 16; Mega Man 4's counter, which starts at 1 on the press, fires nothing under 32, a half charge from 32, and a full one from 92. So the full charge needs a lower count and the half charge a higher one. mega-man-5/charge-line

About: Mega Man 5 Charge shot

{
 "normal": 16,
 "half": 40,
 "full": 80
}

The atlas hasn't traced where Mega Man 5's counter starts, so the thresholds compare counts, not measured frames.

Cited by: Charge shot, Mega Man 5

Mega Man 5 keeps the 0.5 px/frame knockback, always against the way Mega Man faces, but lets the player resist it: with the direction he faces held, the push drops to 0.25 px/frame ($40). mega-man-5/knockback

About: Mega Man 5 Knockback

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

Cited by: Knockback, Mega Man 5