06433: mrheli: Game freezes in the first stage

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06433	Crash/Freeze	Critical (emulation)	Always	Nov 19, 2016, 13:26	Jan 5, 2019, 06:25

Tester	EoceneMiacid	View Status	Public	Platform	MAME (Self-compiled)
Assigned To	AJR	Resolution	Fixed	OS	Windows Vista/7/8 (32-bit)
Status [?]	Resolved			Driver	irem/m72.cpp
Version	0.179	Fixed in Version	0.201	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06433: mrheli: Game freezes in the first stage
Description	Right before the first stage starts to scroll downward, the game freezes. Tried several times, happened every time. Interestingly, the parent set (bchopper) works fine.
Steps To Reproduce	Play the first stage for about two minutes
Additional Information
Github Commit

Flags
Regression Version	0.160
Affected Sets / Systems	mrheli

Attached Files

No.13398 Haze Senior Tester Nov 20, 2016, 23:09 edited on: Nov 20, 2016, 23:10	almost certainly unhappy with the MCU hookup (they're highly sensitive to timing at the very least)
No.13422 Tafoid Administrator Nov 25, 2016, 00:49	The MCU image was added in 0.160 and that is when the emulation hanging began.
No.13424 Haze Senior Tester Nov 25, 2016, 01:27	yeah, the MCUs are meant to cause a bunch of values to be in RAM, the games check these are various points and misbehave if they're not correct. I imagine a timing error is causing them to be written at the incorrect time and erased, or something like that (or the dump is bad and it writes the wrong value)
No.15998 MetalGod Senior Tester Jan 5, 2019, 02:28	Fixed in mame 0.201 0.201: Overhaul V30/8751 comms using DPRAM and GENERIC_LATCH_8 [AJR].