Jdaster64 n.d. · Frame Advance

Cite as: Jdaster64 n.d.
Original: http://i276.photobucket.com/albums/kk21/jdaster64/smb_playerphysics.png
sha256: 70a836db760f63697a5bddf2632895cf220690e5d48de22eee2cc7ea4fe0f110
Archived: https://web.archive.org/web/20130807122227/http://i276.photobucket.com/albums/kk21/jdaster64/smb_playerphysics.png
Accessed: 2026-10-20
Credit: "Exhaustively put together by Jdaster64" (the chart's byline).
Notes: A single 789×6259 PNG chart (sha256 of the archived copy pinned). Values are written in the chart's own hex-digit notation (block, pixel, subpixel, sub-subpixel, sub-sub-subpixel, each 1/16 of the previous), so "00200" is 2/16 px. Its disclaimer says it "is not 100% accurate to the original Super Mario Bros.'s physics engine from a coding perspective". Quotes are transcribed from the image.

Cited on

`InitJS` picks one of five jump rows by take-off horizontal speed, stepping up at `$09`, `$10`, `$19`, and `$1C`.	`JUMPING/VERTICAL PHYSICS, Mario table`	T3
Mario's top ground speed is `$18` walking and `$28` running (B held).	`SMB PHYSICS 101 / GROUND PHYSICS, Mario table`	T3
`PlayerYSpdData` starts a jump at −4 px/frame (rows 0–2) or −5 px/frame (rows 3–4).	`JUMPING/VERTICAL PHYSICS, Mario table, Initial Velocity (−Y)`	T3
While a jump rises with A held, gravity is `JumpMForceData`'s `$20`, `$20`, `$1E`, `$28`, `$28` subpixels/frame² for rows 0–4.	`JUMPING/VERTICAL PHYSICS, Mario table, Holding “A” Gravity (+Y)`	T3
After the switch, gravity is `FallMForceData`'s `$70`, `$70`, `$60`, `$90`, `$90` subpixels/frame² for rows 0–4.	`JUMPING/VERTICAL PHYSICS, Mario table, Falling Gravity (+Y)`	T3
`JumpSwimSub` swaps in falling gravity, never back, once speed is zero or downward, or once A is not held both this frame and last after a `DiffToHaltJump` rise.	`JUMPING/VERTICAL PHYSICS`	T3
`MovePlayerVertically` gives `ImposeGravity` a maximum fall speed of 4 px/frame for Mario.	`JUMPING/VERTICAL PHYSICS`	T3
`ImposeGravity` clamps a fall of 4 px/frame or more only when the fraction byte is at least `$80`.	`JUMPING/VERTICAL PHYSICS`	T3