07047: neogeo (when loading up a multi slot system): Next Game and Previous Game buttons won't function. Only one game select button exists.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07047	DIP/Input	Minor	Have not tried	Jul 14, 2018, 18:15	Jul 15, 2018, 08:26

Tester	Hydreigon	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	No change required	OS	Windows 10 (64-bit)
Status [?]	Closed			Driver	neogeo/neogeo.cpp
Version	0.199	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07047: neogeo ( when loading up a multi slot system): Next Game and Previous Game buttons won't function. Only one game select button exists.
Description	These two buttons do not respond at all probably because they don't exist on an actual neo geo machine. Instead, there is one "Select Game" button and that button would go straight to the next game (i.e. 1-->2-->3-->4-->1 on a four slot).
Steps To Reproduce
Additional Information	Checked in a wiring diagram of a four slot neo geo manual and no such input like previous game exists. Read the manual here: http://www.videogameconsolelibrary.com/images/Manuals/91_Neo_Geo_MVS_US-Manual.pdf
Github Commit

Flags	Verified with Original
Regression Version
Affected Sets / Systems	neogeo (when loading up a multi slot system)

Attached Files	neogeo.jpg (94,429 bytes) Jul 14, 2018, 18:15 Uploaded by Hydreigon An actual Neo Geo panel for reference.

No.15275 B2K24 Senior Tester Jul 14, 2018, 19:08	The next game and previous game buttons function in MAME when a credit or more is registered. Apparently there's settings in the Bios menu that can change that behavior.
No.15276 Hydreigon Tester Jul 14, 2018, 19:23 edited on: Jul 14, 2018, 19:32	Found that setting in the manual and the previous button works despite no such button's existence officially (I'd call this submission a mistake if it weren't for that). I stated that it isn't present on any official control panel or a wiring diagram in an official manual. The real question is...how was a previous button input found despite it being hidden?
No.15278 Haze Senior Tester Jul 15, 2018, 00:14 edited on: Jul 15, 2018, 00:23	the way this works is one of the differences between the US / non-US systems I believe use the US bios if you want the behavior you're talking about? edit the forward / back buttons work before inserting a coin with the US bios roms, although there are always both of them, I imagine the cabs with just a 'select game' only had the 'next game' hooked up. edit2 the US bios roms with a cyan test grid background appear to allow you to swap before inserting a coin, the other 2 (green / yellow) do not, which is interesting I was wondering why there were different coloured grids on the US sets and not the others, such behavioural changes might be part of it.
No.15279 cuavas Administrator Jul 15, 2018, 08:26 edited on: Jul 15, 2018, 10:13	Neo Geo system boards with MVS edge connectors (i.e. not JAMMA edge connectors) have next/previous game buttons on contacts 26/d. They read in the same bit positions as P1/P2 select on an AES. There's a "soft DIP" setting accessible in service mode to allow game selection during attract mode. Game selection is always possible during the "press start" countdown. Some control panels may have a only a single select button present - if you want this setup, just don't map a key/button to the other select input. MAME is behaving correctly.