08445: famicom: Sets with "lz93d50_ep1" slot do not start (grey screen)

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08445	Misc.	Major	Always	Oct 18, 2022, 19:29	Oct 27, 2022, 16:56

Tester	Firewave	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Osso	Resolution	Fixed	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	nintendo/nes.cpp
Version	0.248	Fixed in Version	0.250	Build	64-bit
		Fixed in Git Commit	0fd434c	Github Pull Request #

Summary	08445: famicom: Sets with "lz93d50_ep1" slot do not start (grey screen)
Description	The sets do not start and only show a grey screen.
Steps To Reproduce
Additional Information	This affects the followings sets: dbz mtaruru mtarurua mtaruru2 kgundam kgundamadbz
Github Commit

Flags
Regression Version
Affected Sets / Systems	famicom

Attached Files

No.20634 Foxhack Tester Oct 20, 2022, 02:23 edited on: Oct 20, 2022, 02:24	All of these games appear to be Mapper 159 according to NESCartDB, and they all use serial EEPROM to save data. nes/bandai.cpp says that this is not hooked up, so presumably these games refuse to boot because they can't access the data. These should probably be flagged as "not supported" due to this missing functionality. There are shots of these games at ADB, so these may have actually booted at some point; considering the site uses ancient shots, though, who knows when that happened...
No.20635 kmg Senior Tester Oct 20, 2022, 03:48	There is i2cmem code in bandai.cpp, so the comment just means it never worked. I assumed these were working but lacking save support. In fact showing a grey screen is a more recent regression for most of these. In 0.231 they all loaded except mtaruru and its clone. There have been a few i2cmem changes in the last year. Those would be the likely place to start looking for a regression version, but ultimately the save support needs fixing at some point.
No.20668 Tafoid Administrator Oct 26, 2022, 22:41 edited on: Oct 26, 2022, 22:42	https://github.com/mamedev/mame/pull/9630 https://github.com/mamedev/mame/commit/4cb71c31d2b49c6cb20ebe23d3d119503a3cae7a April 27, 2022 This appears to be the offending commit based on the daily builds I have tested.