Spinner Turn Count

Purpose

This is intended to be a page to keep track of the correct turns ratio of spinner/dial/paddle/trackball-controlled arcade games. Below is comma-separated text, hopefully this is a useful format.

Q: How do I use this information?

A: To tweak the analog sensitivity in MAME to better emulate real hardware.

An example from the first link below: Tempest, 72 count

if the control you use has 1200 counts per turn, the sensitivity calculation is: Sensitivity = 100 * 72 / 1200 = 6%

Links (Recommended Reading)

http://forum.arcadecontrols.com/index.php?topic=61381.0

http://forum.arcadecontrols.com/index.php?topic=23967.0

http://forum.arcadecontrols.com/index.php?topic=42401.msg474159#msg474159

Data

Effective_Tooth_Count = teeth that pass through the optical sensor per revolution of the knob (multiply by any gear ratios to obtain)

Counts_Per_Revolution = could be 1x, 2x, or 4x of the Effective_Tooth_Count (depends on original hardware interpretation of optical sensor information)

Other_Notes = quantitative information relating to game play (like degrees of turn from one side of the screen to another - useful for potentiometer games like Warlords)

Game	Effective_Tooth_Count	Counts_Per_Revolution	Other_Notes
720 degrees	72	144
Ivan Ironman Offroad	154.286		Geared: 60 teeth on the steering wheel shaft, meshes with a 14 tooth gear on the encoder shaft, which has 36 teeth on its encoder wheel
Disks of Tron	128
Blasteroids	72
Tempest	72		1 full turn moves 5 spaces on first screen
Pole Position	102 6/7		Geared: 60 tooth gear on wheel shaft, 14 tooth gear on 24 tooth encoder disk shaft => (60 / 14) * 24 = 102 6/7
Arkanoid	486		Geared: The knob attaches to shaft #1, which has a 72 tooth gear on it. That gear turns a 16 tooth gear on shaft #2. Shaft #2 also has a 72 tooth gear on it, which then turns a 16 tooth gear on shaft #3. Shaft #3 also has the encoder wheel on it, which has 24 teeth. 120-130 deg = one traversal across the screen
RoadBlasters	24		Limited Wheel/Yoke
Warlords	(n/a - pot)	(n/a - pot)	120-130 deg one traversal end to end of castle
Super Breakout			120-130 deg one traversal across the screen
Turbo			2 1/2 turns to go across the screen
Sprint			1/2 turn is 90 deg
Super Sprint			360 deg turn of wheel moves about 170 deg
Happ 3-inch Trackball	167.4 (no wear)		3 inch ball, 0.43 inch roller, 24 tooth encoder wheel
Happ 2.25-inch Trackball	149.2 (no wear)		2.25 inch ball, 0.362 inch shaft, 24 tooth encoder wheel

Trackball Games: Game Name, Notes

Crystal Castles, 1st screen BB moves length of line above his head from center of trackball moved to one side

Centipede, 1 trackball move 1 end to other (stock tb) 2 1/2 mushroom lengths

Missle Command 1 full end to end visible trackball movement goes from left to the right of the little bump after the missile base