09035: aplscar, ktx20t02, megapc, megapcpl, ochipvlp, pcd4nl, sm48650usc: Silent exit at start or just after

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09035	Crash/Freeze	Critical (emulator)	Always	Dec 18, 2024, 07:32	Sep 12, 2025, 06:11

Tester	Robbbert	View Status	Public	Platform	MAME (Self-compiled)
Assigned To		Resolution	Fixed	OS
Status [?]	Resolved			Driver	pc/at.cpp
Version	0.272	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	09035: aplscar, ktx20t02, megapc, megapcpl, ochipvlp, pcd4nl, sm48650usc: Silent exit at start or just after
Description	These machines will quit either when started, or a few seconds into the boot sequence. No message.
Steps To Reproduce	Start the machine and within seconds it will unexpectedly quit.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	aplscar, ktx20t02, megapc, megapcpl, ochipvlp, pcd4nl, sm48650usc

Attached Files

No.22617 AJR Developer Dec 18, 2024, 23:15	I can reproduce segmentation faults on all machines listed except aplscar, which yields: MAME exception: i386: Called modrm_to_EA with modrm value C8!
No.22639 Firewave Senior Tester Dec 20, 2024, 14:36	Sets are flagged MNW so this report should be invalid.
No.22649 hap Developer Dec 20, 2024, 16:41	Not an invalid report, you can't hide a crash or MAME freeze behind a MNW flag.
No.23678 Robbbert Moderator Sep 12, 2025, 06:11	The crashing problem has been fixed. Some machines now start up, while others produce a fatal error. Unknown who fixed it or when.