08920: sxevious: Repeats power ROM/RAM check a lot of times

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08920	Timing	Major	Always	Sep 19, 2024, 05:06	Nov 2, 2024, 13:44

Tester	Bugfinder	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Confirmed			Driver	namco/galaga.cpp
Version	0.269	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08920: sxevious: Repeats power ROM/RAM check a lot of times
Description	Super Xevious is rebooting after initial ROM/RAM check. If you throttle, it will happen 3 to 4 times.
Steps To Reproduce	Load the game and let it make its self-check. It does it more than one time, can repeat up to four times.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	sxevious

Attached Files

No.22331 Robbbert Moderator Sep 19, 2024, 05:18 edited on: Nov 2, 2024, 09:24	This is actually already known, from https://github.com/mamedev/mame/issues/12483 However, Mametesters is the best place for this report, so I'll ask the devs to close the issue. The notes from the issue: Osso said: Confirmed, regression version seems to be 0.254 Suspect commit: https://git.redump.net/mame/commit/?id=c0b57d30f0ce39c445190fe4e27bec6c57ebb137 Kale said: Reset isn't caused by watchdog, but rather an intentional snippet where it expects: 3C80: cp $95 ; from $8063 RAM buffer 3C82: jp nz,$0000 0000: ld a,$10 0002: ld ($7100),a Game eventually boots anyway (at least by speeding emu up here), but somehow this is 0x05 the first time around.
No.22335 Bugfinder Tester Sep 19, 2024, 19:56 edited on: Sep 19, 2024, 20:12	OK Robbbert, I didn't check MAMEDev's GitHub because honestly, never thought to search there first. I always had MAMETesters in mind for bug reporting ;)
No.22337 pmourao Tester Sep 22, 2024, 13:57	Hi, I would like to add the following observation to the bug description: If the file "sxevious.hi" does not exist in hiscore folder, sxevious reboots three to four times. If the file exists, only a single reboot occurs.
No.22400 hap Developer Nov 2, 2024, 12:49 edited on: Nov 2, 2024, 13:47	I was fiddling with the timing. I tried to make the namco06 clock like this: -_-_-_-_ instead of _-_-_-_- And that fixed the sxevious issue. But it (re)introduces explosion/shot sound bugs in bosco. And tweaking quantum in galaga.cpp makes it worse? That's not a good sign. It's so sensitive. So, scrap that. Also, I changed bug severity from critital to major. It's a pain to have to wait for the bootup, but if your finger finds the INS key, the game itself works fine.