08716: alpine, alpinea: Timer runs faster than arcade hardware.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08716	Gameplay	Minor	Always	Jul 10, 2023, 22:58	6 days ago

Tester	johnmcallister	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	taito/taitosj.cpp
Version	0.250	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08716: alpine, alpinea: Timer runs faster than arcade hardware.
Description	The in game timer runs around 5 seconds faster in 1 downhill run which takes 23.5 in game for arcade and 28.5 in mame. The actual real time is within 1/2 second though. You can find the information here, videos and description. https://www.twingalaxies.com/showthread.php/262022-Arcade-Alpine-Ski-Points-Tournament-Settings-999-999?p=1192607&posted=1#post1192607
Steps To Reproduce	Always happens
Additional Information	I tried in 106 and 250 and is the same.
Github Commit

Flags
Regression Version
Affected Sets / Systems	alpine, alpinea

Attached Files

No.22444 hap Developer 6 days ago	Looks like it's a Z80 waitstate issue, schematics show that the WAIT pin is connected to several things. If you underclock the maincpu in MAME, it affects the game timer rate. Strange that they didn't use a vsync counter for the timer.