08923: gbc: Certain loose software causes the red warning screen to appear instead of the usual yellow screen

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08923	Media Support	Minor	Always	Sep 25, 2024, 14:25	Oct 6, 2024, 07:39

Tester	Robbbert	View Status	Public	Platform	MAME (Self-compiled)
Assigned To		Resolution	Invalid report	OS	Windows 10/11 (64-bit)
Status [?]	Closed			Driver	nintendo/gb.cpp
Version	0.269	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08923: gbc: Certain loose software causes the red warning screen to appear instead of the usual yellow screen
Description	The loose software game "Robopon" (2 different versions) cause the warning screen to change when starting the console. It should say: "Imperfectly emulated features: graphics, sound", but the Robopon games cause it to instead say: "Completely unemulated features: sound, communications Imperfectly emulated features: graphics" and the screen is red. The game runs fine - with sound. Loose software should not change the warning, as far as I know - unless things have changed recently.
Steps To Reproduce	Start MAME with the command line (adjusted for the location of your software) >mame gbc -cart "E:\data\nintendo\gb\ok\Robopon - Star Version (2000)(Atlus)(US)(Proto).gbc" There's a similar game that also causes the problem >mame gbc -cart "E:\data\nintendo\gb\ok\Robopon - Sun Version (2000)(Atlus)(US)(Proto)[GBC][SGB].gbc"
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	gbc

Attached Files

No.22342 Robbbert Senior Tester Sep 25, 2024, 14:47	Looks like it's normal for that game.
No.22359 cuavas Administrator Oct 6, 2024, 07:36	Those cartridges contain IR communication hardware and piezo speakers that aren’t emulated (as well as the very incomplete simulation of the 4-bit microcontroller used as a real-time clock).
No.22360 cuavas Administrator Oct 6, 2024, 07:39	You can play those games, but I wouldn’t say they’re “fine”. Alarms, cooldown periods, etc. that depend on the real-time clock and whatever else it uses the microcontroller for probably don’t work properly, and there’s the missing infrared link feature (marketed as “GB KISS”).