07597: kchampvs3: Inp file playback gets out of sync right after finishing the game with 1cc

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07597	Save/Restore	Minor	Always	Mar 25, 2020, 17:56	Oct 7, 2020, 19:57

Tester	rcoltrane	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Confirmed			Driver	dataeast/kchamp.cpp
Version	0.219	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07597: kchampvs3: Inp file playback gets out of sync right after finishing the game with 1cc
Description	I've played the entire game with 1 credit/coin and after beating it (with NVRAM disabled), I started it again to playback my gameplay in order to record a video. But at the 5th match of the 1st loop, the inputs got out of sync and it screwed up my recording.
Steps To Reproduce	Finish the game with 1 credit (2 loops of 12 matches) recording an .inp file with nvram disabled and after that try to playback your generated .inp file to record an .avi video.
Additional Information	I've uploaded my 1cc .inp file here so you guys do not have to play it to the end to see the error. I also tried to erase my .hi hiscore file without success, it had the same sync issue while trying to playback.
Github Commit

Flags
Regression Version
Affected Sets / Systems	kchampvs3

Attached Files	kchampvs3 - 1cc.inp (889,128 bytes) Mar 25, 2020, 17:56 Uploaded by rcoltrane

No.17512 Tafoid Administrator Mar 25, 2020, 22:21 edited on: Mar 25, 2020, 22:54	Confirmed with playback on 0.217 and 0.219, even though recording is made on MAME 0.217 according to header. I don't see that the game has an NVRAM that saves at all. .hi files shouldn't interfere with recording/playback.
No.17520 Kale Developer Mar 31, 2020, 21:20	It uses a dual joystick attached to 4 way gates. This already led to playback issues in the past (on non-4way sticks mind you), and I'm not a fan of how it handles since it's a clear design fault and doesn't reflect how reality works out -> https://github.com/mamedev/mame/blob/master/src/emu/ioport.cpp#L475
No.17521 Haze Senior Tester Mar 31, 2020, 21:24	.hi files can very much interfere with playback / recording in some cases tho as they're changing game state. while this game is probably too early for it some games will adjust rank based on scores achieved on the machine.
No.18026 Tafoid Administrator Oct 1, 2020, 19:58	Does this also no longer malfunction for you, rcoltrane as related to 07719 07754 07761?
No.18039 rcoltrane Tester Oct 6, 2020, 18:01	I'll do another run on this game and let you know the result here.
No.18045 rcoltrane Tester Oct 7, 2020, 19:57	I played it again with the latest MAME 0.225 until the end of the second loop, but the playback lost synchronization in the first stage of the second loop again. So the .inp playback remains broken for this game for unkknown reasons. Since this game is in my library, I can keep testing its record/playback issue on future MAME versions upon request.