08941: All games using the sammymdl BIOS set except tdoboon: Games return "Hopper Overrun" error upon exiting service menu after backup RAM initialization

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08941	Crash/Freeze	Critical (emulation)	Always	27 days ago	27 days ago

Tester	JimCarlTay	View Status	Public	Platform	MAME (Official Binary)
Assigned To	hap	Resolution	Fixed	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	sigma/sigmab98.cpp
Version	0.270	Fixed in Version	0.271	Build	64-bit
		Fixed in Git Commit	2021a6e	Github Pull Request #

Summary	08941: All games using the sammymdl BIOS set except tdoboon: Games return "Hopper Overrun" error upon exiting service menu after backup RAM initialization
Description	Games affected: Animal Catch (animalc), Hae Hae Ka Ka Ka (haekaka), Hayauchi Gun Kids (gunkids), Itazura Monkey (itazuram), and Pye-nage Taikai (pyenaget) After initializing the backup RAM upon first boot by holding F2 to go to the service menu or clearing the backup RAM on the service menu's Set Mode, exiting the service menu would lead to an error (Hopper Overrun), accompanied by sound effects and Japanese voice lines.
Steps To Reproduce	For Animal Catch and Hayauchi Gun Kids: 1. Be sure to delete the game's NVRAM files and .cfg file first. 2. Load the game, then wait until you see a blue screen with "Backup RAM: NG, Color: OK." 3. Hold F2 to go to the service menu. Press F2 to pick a choice, and press Ctrl (shot) to accept the choice. 4. Exit the service menu. 5. The error pops up. For Hae Hae Ka Ka Ka, Itazura Monkey, and Pye-nage Taikai: 1. Load the game. 2. Hold F2 and press F3 while holding F2 to go to the service menu. In the case of Hae Hae Ka Ka Ka, 9 is the key used to accept the choice instead of Ctrl, while for Itazura Monkey and Pye-nage Taikai, Ctrl is used to accept choices. 3. Go to the Set Mode menu and clear the backup RAM. Make sure "RAM Clear" is highlighted, then hold 9 (for Hae Hae Ka Ka Ka) or Ctrl (for Itazura Monkey and Pye-nage Taikai) until "OK" appears. 4. Exit the Set Mode menu and the service menu. 5. The error pops up after the Sammy logo.
Additional Information	Tested with IPL version 5.0. The screenshots below are visual representations of the error as seen in those games. This could be a potential regression because the games (more specifically Hayauchi Gun Kids, from my experience) were working properly with no errors in previous versions. The severity status is "Critical (emulation)" because it hinders the ability to play these games. Due to the nature of this error, it is labeled as a crash or freeze. Strangely, Taihou de Doboon is not affected by this issue.
Github Commit

Flags
Regression Version	0.270
Affected Sets / Systems	All games using the sammymdl BIOS set except tdoboon

Attached Files	animalc-hopper.png (8,532 bytes) 27 days ago Uploaded by JimCarlTay The error as seen on Animal Catch
	gunkids-hopper.png (6,078 bytes) 27 days ago Uploaded by JimCarlTay The error as seen on Hayauchi Gun Kids
	haekaka-hopper.png (7,781 bytes) 27 days ago Uploaded by JimCarlTay The error as seen on Hae Hae Ka Ka Ka
	itazuram-hopper.png (5,511 bytes) 27 days ago Uploaded by JimCarlTay The error as seen on Itazura Monkey
	pyenaget-hopper.png (8,634 bytes) 27 days ago Uploaded by JimCarlTay The error as seen on Pye-nage Taikai

No.22389 hap Developer 27 days ago	Regression from https://github.com/mamedev/mame/commit/b68c96e6c7d926b2d8f62c2dec657757ae46f455
No.22390 JimCarlTay Tester 27 days ago edited on: 27 days ago	Thanks. That was quite the quick response. Meanwhile, I was trying out Taihou de Doboon (the only game unaffected by this issue) and it freezes after you shoot down an enemy (easiest way to reproduce is to shoot down a low-ranking one after inserting one coin). Shall I go ahead and make a report about that as well?
No.22391 hap Developer 27 days ago	No need, that one looks fixed too.