08419: All with a secondary optional BIOS: MAME should not prevent running a system if a BIOS that is not selected is not present.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08419	Interface	Feature	Always	Sep 18, 2022, 19:34	Sep 18, 2022, 19:47

Tester	star2root	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Won't fix	OS
Status [?]	Closed			Driver
Version	0.247	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	08419: All with a secondary optional BIOS: MAME should not prevent running a system if a BIOS that is not selected is not present.
Description	An error should be thrown a the time the BIOS is actually attempting to load. Missing additional BIOS ROMs should not prevent a system from running if they are not needed.
Steps To Reproduce	Use any system, delete a BIOS ROM that replaces another one when selected and try to run the system emulation from the builtin GUI.
Additional Information	I think the way to fix this might be to mark the ROM as optional and the change the way optional ROMs are handled so that it distinguishes between an invalid check sum and file not found. If the check sum is invalid, it should throw a warning and continue because someone might be testing or debugging a ROM, but if the file is missing at the time of loading, it should throw an error and abort. Saying this is too hard to fix or saying this is how it works is NOT a reason to mark this issue as invalid. Marking this as invalid without discussion is necessarily aggressive and counter productive. MAME should be throwing an error at the time MAME actually attempts to load the ROM, not when the emulation is launched. Saying "oh, just launch it from the command line" is NOT answer, as that simply makes the user interface pointless. If you are going to have a GUI, then support it and make it work PROPERLY. If here is a problem where this was reported incorrectly, we should discuss it first before marking it as invalid without discussion.
Github Commit

Flags
Regression Version
Affected Sets / Systems	All with a secondary optional BIOS

Attached Files