08316: wmg: when a game is chosen from the menu, it has a black screen or resets

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08316	Gameplay	Major	Always	May 16, 2022, 23:11	May 18, 2022, 12:20

Tester	Robbbert	View Status	Public	Platform	MAME (Self-compiled)
Assigned To	Robbbert	Resolution	Fixed	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	midway/wmg.cpp
Version	0.243	Fixed in Version	0.244	Build	64-bit
		Fixed in Git Commit	ffdc90a	Github Pull Request #

Summary	08316: wmg: when a game is chosen from the menu, it has a black screen or resets
Description	You should be able to press 1 to choose a game, and 2 to play it. Currently, when 2 is pressed, the rug shows then it has a black screen or resets. (Defender is the only game that works)
Steps To Reproduce	As above
Additional Information	Tafoid kindly tracked this down to one (or both) of these commits by MooglyGuy https://github.com/mamedev/mame/commit/06ed986b2ca70dfd9c2a3a2abde8b14513799044 https://github.com/mamedev/mame/commit/5158e9d91617bd96883bc74603d1059e3c757ee8
Github Commit

Flags
Regression Version	0.218
Affected Sets / Systems	wmg

Attached Files

No.20203 Robbbert Moderator May 18, 2022, 12:20	The blitter was trying to write to the wmg_banked_map address space, instead of the IO_PROGRAM address space. The same code is used by defender, but it doesn't use the blitter, so the defect wasn't noticed.