08741: tmek20: TMEK 2.0 hangs on title screen

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08741	Crash/Freeze	Critical (emulation)	Always	Aug 4, 2023, 13:13	Feb 1, 2024, 12:55

Tester	80sRay	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Confirmed			Driver	atari/atarigt.cpp
Version	0.257	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08741: tmek20: TMEK 2.0 hangs on title screen
Description	The T-MEK (2.0, Prototype) set completely hangs MAME a few seconds after reaching the title screen. There's no backtrack since I have to use Task Manager to force quit MAME. The other sets don't crash and seem to work as well as can be expected.
Steps To Reproduce	Run MAME, choose T-MEK 2.0 and wait.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	tmek20

Attached Files

No.21686 80sRay Tester Aug 4, 2023, 13:15	Dupe of 07146.
No.21687 Robbbert Senior Tester Aug 4, 2023, 14:25	Supposedly fixed in MT 07146 (unknown commit), but it's happening again.
No.21694 Osso Moderator Aug 12, 2023, 05:42	tbh it happens to me even if I launch 0.254, where it was reported fixed.
No.21930 Kale Developer Jan 31, 2024, 23:40 edited on: Jan 31, 2024, 23:40	Can't reproduce, tried with and without -throttle, Windows 10 over recent-ish 0.261 build.
No.21931 Robbbert Senior Tester Feb 1, 2024, 05:42	Just tried with 0.262, it ran very slowly (4%) so I quit. This left an error.log of 1.7GB . So I ran it again with -nolog, and this soon became non-responsive exactly as reported. Therefore it's still as much of a problem as it always has been.
No.21932 Robbbert Senior Tester Feb 1, 2024, 06:04	Summary of error.log - Many lines of 'maincpu' (000A0A): unmapped program memory write to C40040 = 000F000F & FFFF0000 - unmapped memory write to C40000 followed by a read from there. - the remainder of the log is full of bad writes and reads by the 'cage:cpu' which appears to be the main cause of the problem. - eventually the entire thing just freezes, with the error log at 3,272,109,653 bytes.
No.21934 hap Developer Feb 1, 2024, 12:55 edited on: Feb 1, 2024, 12:56	Yeah, bug still happens to me too. boot game -> title screen -> "insert coin" message flashes a few times -> MAME locks up.