LR-MAME2003 speeding up with B-button press

windale

There is also something similar in the game Track & Field and/or Hypersports ? One of the buttons is mapped to a 'Run Like Hell' cheat, which needs to be turned off/remaped for most of the events and entering your name

caver01

@dankcushions said in LR-MAME2003 speeding up with B-button press:

to be clear, the 'ui cancel' button is not the 'exit mame' button. in fact, it is mapped to button 1 (retropad b) by default.

That makes sense. I made it more confusing, partly because while navigating the GUI menus in AdvanceMAME, you can back out of the menus with <ESC> which is also the EXIT key. I always forget it works differently in the lr-mame2003 GUI

RumblinBuffalo

@dankcushions said in LR-MAME2003 speeding up with B-button press:

SOLVED:
https://github.com/libretro/mame2003-libretro/blob/7b55725e744ac9702db092f996e2fca2276146b2/src/drivers/pacman.c#L1016

there's a speedup hack in pacman + ms pacman that is bound to button1.

I'm not sure this is the same issue that I am indicating. I'll try a few more roms later - and provide examples - but I have seen this issue in far more than just Pacman/MsPacman. I know that Mat Mania, Dig Dug, Joust and others all had the same issue, and as soon as I removed "B" from the mapping for "UI back" the problem went away. And tapping the ESC key (still mapped to "UI back") still showed the issue.

I agree that it makes no sense that "UI back" should do anything in the game, but in my experience it seems to skip a frame or create a split-second speed-up.

RumblinBuffalo

I tested a few more roms tonight.

Just to be sure, in the Mame2003 UI, I have mapped "UI back" to the ESC key and to the retropad button L1.

"Ui back" should have no effect on games, but with all games I tested, I could see/hear the speed up effect by pressing the L1 button on my gamepad. I tested Dig Dug, Frogger, Ghouls 'n Ghosts, and Kung Fu Master. It also happened with the ESC key, which should eliminate my gamepad as a cause.

I really don't believe I have any setting changed from the default in Mame2003 that would cause this, but the fix was easy enough (just make sure I un-map the "UI back" command away from any gamepad buttons that are used).

I will mention the effect is very subtle, so it's possible with many games in Mame2003, perhaps people just don't notice. It took me 2 months to realize it was with every rom.

As always - appreciate all the responses and efforts.

dankcushions

@RumblinBuffalo said in LR-MAME2003 speeding up with B-button press:

I tested a few more roms tonight.

Just to be sure, in the Mame2003 UI, I have mapped "UI back" to the ESC key and to the retropad button L1.

"Ui back" should have no effect on games, but with all games I tested, I could see/hear the speed up effect by pressing the L1 button on my gamepad. I tested Dig Dug, Frogger, Ghouls 'n Ghosts, and Kung Fu Master. It also happened with the ESC key, which should eliminate my gamepad as a cause.

I really don't believe I have any setting changed from the default in Mame2003 that would cause this, but the fix was easy enough (just make sure I un-map the "UI back" command away from any gamepad buttons that are used).

I will mention the effect is very subtle, so it's possible with many games in Mame2003, perhaps people just don't notice. It took me 2 months to realize it was with every rom.

As always - appreciate all the responses and efforts.

assuming you mean "UI Cancel" rather than "UI back" (which i don't think exists?) i think i see where your issue MIGHT be: https://github.com/libretro/mame2003-libretro/blob/7b55725e744ac9702db092f996e2fca2276146b2/src/usrintrf.c#L3856

i need to confirm, but i'm sure your right. it does look like it's polling UI_CANCEL every frame for whatever reason.

caver01

@dankcushions said in LR-MAME2003 speeding up with B-button press:

it does look like it's polling UI_CANCEL every frame for whatever reason.

It looks like that check is there to accept UI_CANCEL for when/if the OSD MENU is open. If it is, it triggers the menu to close, screen to refresh.

RumblinBuffalo

@dankcushions You're right - I meant UI_CANCEL.

So if I understand correctly, the theory is that polling allows the UI-CANCEL command to be activated/triggered by the button press (even when the UI menu isn't present), thus causing the tiny frame jump that I kept seeing?

Thanks as always for your efforts.

dankcushions

This is now fixed! please update mame2003 from source to get the fix straight away (takes about 40 minutes to install)

Thanks very much to @RumblinBuffalo for the good spot and report!This was a bit of a clunky bug that would have gone missed without your attention :)

pjft

@dankcushions thanks for the quick turnaround! I have updated though I haven't tried it yet. Have a great weekend :)

RumblinBuffalo

@dankcushions Glad to be of assistance and thanks for the quick attention and update. I'll say it again - the efforts of the Retropie team and this community are really impressive! Many thanks!

fritz

Thanks for addressing the issue, much appreciated. But:

The fix does appear to solve a few symptoms of the problem, but it does not solve the problem itself. There is still a check on the b-button, and it does slow down/skip frames on some occasions.

Try for instance Commando or Flying Shark. Some proper fast button mashing on B will still slow down the game or result in slightly visible frameskips.

Thorr69

Ressurecting this topic because I noticed that after I upgraded to RPi 4.5 that the speed cheat in Ms pac-man stopped working altogether. I checked the inputs on the TAB menu and button B isn't listed there. There are no dipswitch settings for it, either. I am curious if this is a driver change or if it's something that got broken in the update?