After hours of research and testings I still can’t figure it out how to access to “Dip Switches” menu on lr-imame4all.
On the other emulators simply pressing the Tab key shows the MAME menu and you can select “Dip Switches”.
I looked the whole retroarch menu settings and options, there’s nothing there.
Finally I have MK2, MK3 and UMK3 working pretty well on the raspberry pi 2 B+ with lr-imame4all, but I need to increase the volume (by default is TOO LOW, barely audible), and this only can be done from the service mode menu (with the dip switches).
I was just about to make a thread on this exact same issue. 🙂
I’ve also tried everything I can think of to get into the test/service menu on mame4all-libretro. I prefer to use retroarch for the shaders (the mame4all scanline shader is pretty poor) and for the extensive settings compared to mame4all.
The cave shooter, ESP Ra.De. won’t progress past the initial mandatory test/service screen because I can’t exit it. All other cave shooters I’ve tried also start with the picture flipped upside down, which is something else that I need to get into the service/test menu for.
I can also confirm that anything past the first Mortal Kombat, doesn’t work on mame4all.
Mortal Kombat – Works
Mortal Kombat 2 – Segmentation fault
Mortal Kombat 3 – Segmentation fault
ESP.Ra.De – Works – Flip screen by choosing “Invert” under config menu, then save with holding down “F2”
Mortal Kombat – Works (Need to increase volume in RGUI settings)
Mortal Kombat 2 – Works (Need to increase volume in RGUI settings)
Mortal Kombat 3 – Works (Need to increase volume in RGUI settings)
ESP.Ra.De – Stuck at service menu
Mortal Kombats – all a bit slow except maybe the first one.
ESP.Ra.De – Works – looks better than mame4all – doesnt start at service menu
I’ll try to find the service menu option on lr-mame4all
RetroPie help guides --> https://goo.gl/Yfy8kj
Please read this before asking for help --> http://goo.gl/eLErnl