Viewing Issue Advanced Details
|ID||Category [?]||Severity [?]||Reproducibility||Date Submitted||Last Update|
|07685||DIP/Input||Minor||Always||Jun 12, 2020, 09:42||Jul 13, 2020, 02:50|
|Tester||oboewan42||View Status||Public||Platform||MAME (Official Binary)|
|Assigned To||Resolution||Open||OS||Windows 10 (64-bit)|
|Version||0.221||Fixed in Version||Build||64-bit|
|Summary||07685: sonic, cabalus, possibly others using upd4701a: mapping joystick to trackball causes input to go haywire|
|Description||Moving an analog joystick axis that's mapped to a trackball axis - specifically one connected to a uPD4701A - causes the input to go haywire, even when sensitivity is set to 1. Mouse input appears to work fine.|
|Steps To Reproduce||Map an analog stick to a trackball (MAME is set up this way by default if you have a controller with an analog stick), then move the stick and watch the analog controls go haywire. Visible in-game, in the test menu in sonic, and in the "Analog Controls" menu. Compare with version 0.185.|
I vaguely remembered being able to play SegaSonic perfectly fine with an analog stick in an older version of MAME, so I checked for a regression. Last working version was 0.185, it broke in 0.186. Looking in the whatsnew it looks like there was a rewrite of the code for the uPD4701A around that time.
Tested in sonic and cabalus, both exhibit this issue, haven't had a chance to look at anything else (what other games use it?)
Centipede works fine, so it seems to be limited to that chip.
|Affected Sets / Systems||sonic, cabalus, possibly others using upd4701a|
|There are no relationship linked to this issue.|
Jun 14, 2020, 19:00
|I don't have a decent non-mouse analog device to use for testing at this time, but I've acknowledged for now.|
Jun 18, 2020, 17:47
This may be a problem with not accounting for PORT_RESET, which the uPD4701 emulation now depends on.
Other sets to test include arknoid2, ridleofp and simpbowl.
Jun 18, 2020, 19:10
|arknoid2 and ridleofp have the same issue (did not test simpbowl)|