08943: quizpun2: Black Screen - Does not Boot

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08943	Crash/Freeze	Critical (emulation)	Always	Oct 26, 2024, 21:54	Oct 26, 2024, 22:50

Tester	Tafoid	View Status	Public	Platform	MAME (Official Binary)
Assigned To	hap	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	misc/quizpun2.cpp
Version	0.270	Fixed in Version	0.272	Build
		Fixed in Git Commit	26fe79b	Github Pull Request #

Summary	08943: quizpun2: Black Screen - Does not Boot
Description	This machine, while labeled not working for various reasons, used to at least boot and show screen. This no longer happens and a black screen is all you see. The parent never worked as far as I can tell.
Steps To Reproduce
Additional Information	Breakage occurs on work between July 17-19. Checking commits flags this as the most likely reason: https://github.com/mamedev/mame/commit/05b1ce44fef84c5abae8f752e279668dbe046e8e
Github Commit

Flags
Regression Version	0.268
Affected Sets / Systems	quizpun2

Attached Files

No.22396 AJR Developer Oct 26, 2024, 22:20	I used major hacks to force the Z80 to wait for responses from the COP402 MCU. The Z80 overhaul no doubt broke this method, but probably allows for a better one. (I recall similar hacks being already in place for quizpun, which uses a MC68705P5 MCU instead.)