09396: galivan and clones: only are used 2 buttons

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09396	DIP/Input	Minor	Have not tried	Feb 28, 2026, 23:24	15 days ago

Tester	motomachi16	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows (x64)
Status [?]	Acknowledged			Driver	nichibutsu/galivan.cpp
Version	0.286	Fixed in Version		Build	x64
		Fixed in Git Commit		Github Pull Request #

Summary	09396: galivan and clones: only are used 2 buttons
Description	In MAME, galivan and clones are implemented with three buttons, but only two are actually used.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	galivan and clones

Attached Files

No.24177 motomachi16 Tester Feb 28, 2026, 23:29	Galivan service manual. https://www.arcade-museum.com/manuals-videogames/G/Galivan-Cosmo-Police-pinDIP.pdf
No.24180 motomachi16 Tester Mar 1, 2026, 00:16	The game program has a process to detect the third button, and you need to press the third button when moving while hanging, but this is not necessary in the actual game. I suspect this is because the specifications were changed from 3 buttons to 2 buttons before release, and the wires were directly connected without using buttons.
No.24181 hap Developer Mar 1, 2026, 00:31	Ah I see, I'll re-add the button then for this game. Opinions are divided: IMO MAME should only emulate buttons that are on the control panel, rare exceptions aside. Others will say that if the game has any way to detect it, like here in Galivan, or the 3rd button in testmode in Ninja Emaki, MAME should emulate it. Or in extreme case, some will say MAME should have inputs on all ports that the hardware can access in theory (which would be a lot).
No.24297 motomachi16 Tester 15 days ago	This is just my personal impression, but if you're going to reproduce not only the operation of the circuit board but also the wiring of the levers and buttons, I think it would be more consistent to make those wiring the same as the original. That said, I naturally respect the MAME development team's decision.