06154: Games with a rotary positional joystick: Some positions are skipped

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06154	DIP/Input	Minor	Always	Mar 7, 2016, 23:29	Oct 17, 2017, 22:00

Tester	izius	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Kale	Resolution	Fixed	OS	Windows XP
Status [?]	Resolved			Driver
Version	0.171	Fixed in Version	0.191	Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	06154: Games with a rotary positional joystick: Some positions are skipped
Description	In games with a rotary positional joystick, if you rotate continuosly in a direction, eventually a position will be skipped (in most cases - see Additional Information). This occurs only when Positional Reverse is set to on (in many cases it is by default); when off it works perfectly. If you use the keyboard to rotate, it happens only when rotating clockwise; if you use -mouse, however, it happens also anticlockwise if you set a very low sensitivity.
Steps To Reproduce
Additional Information	Details for single games (tested with -mouse, 0 digital speed and 1 sensitivity): gwar, hbarrel, ikari, midres, searchar, timesold, tnk3, worldwar and their respective clones: skip one position every 12. gondo and makyosen: go back one position every 10. ikari3j and ikari3u: go back two positions every 12. victroad and dogosoke: skip one position every 12 if going clockwise, and two if going anticlockwise. downtown and clones, jackalr, topgunbl: no problems - Positional Reverse is off by default (if turned on, see gondo and makyosen).
Github Commit

Flags
Regression Version	0.144u3
Affected Sets / Systems	Games with a rotary positional joystick

Attached Files

No.12443 haynor666 Tester Mar 8, 2016, 11:33 edited on: Mar 8, 2016, 11:51	I can confirm this issue. It's very old problem. In similiar fashion also mouse movement is sometimes not readed correctly for example when I rapidly move mouse to left, in game move to right. This was already reported - http://forum.arcadecontrols.com/index.php/topic,148821.0.html but I thought is only certain trackballs problem.
No.12444 Haze Senior Tester Mar 8, 2016, 13:58	IIRC at least for the SNK games there's actually a protection of some kind tied to this, maybe the odd skipped position is actually required.
No.12446 NekoEd Senior Tester Mar 8, 2016, 17:46	I'm going to confirm this per haynor666, but we'll have to look into the SNK games and see if the skipped positions there are a BTANB.
No.12454 hap Developer Mar 11, 2016, 10:12	I doubt a core problem like this is actually a (mis)feature to fix specific drivers. :) The drivers listed by the tester are not just SNK games.
No.13686 haynor666 Tester Mar 8, 2017, 21:05 edited on: Mar 8, 2017, 21:08	Tested with Ultimarc U360 rotary upgrade (serving as mouse under system) and problem is still visible. Besides this it seems that even sensivity 1 is still too big value to simulate full player 360 degree spin using full U360 full 360 degree spin.