09288: vf: In vf, Guard+Punch is supposed to be able to grab/throw characters but does nothing

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09288	Gameplay	Major	Always	4 days ago	2 days ago

Tester	samsho2	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows (x64)
Status [?]	Confirmed			Driver	sega/model1.cpp
Version	0.281	Fixed in Version		Build	x64
		Fixed in Git Commit		Github Pull Request #

Summary	09288: vf: In vf, Guard+Punch is supposed to be able to grab/throw characters but does nothing
Description	Pressing Guard+Punch does not perform grappling moves in vf.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version	0.217
Affected Sets / Systems	vf

Attached Files

No.23757 Robbbert Moderator 3 days ago	Do you have proof?
No.23758 PL1 Tester 3 days ago edited on: 3 days ago	Each character has special moves. Jacky Bryant, Sarah Bryant, Lau Chan, Pai Chan, Kage-Maru, Wolf Hawkfield, and Jeffry McWild use the Guard (Button 3) + Punch (Button 1) combination mentioned above. https://strategywiki.org/wiki/Virtua_Fighter/Moves Tried to pull off this special move combo with several characters for about 10 minutes of test time, but only managed to get Lau Chan to execute a throw one time against Jeffry McWild when he was about to push me out of the ring. Looks like the timing and conditions to execute special moves are very specific. Not sure how hard it is to pull off these combos on original hardware. Scott P.S. Looks like there is a special move for Akira Yuki that is not mentioned in the Strategy Guide linked above. At 12:44 of this video, he sweeps the opponent.
No.23759 Robbbert Moderator 3 days ago	Thanks Scott. It's now confirmed.
No.23760 PL1 Tester 3 days ago	Did some more ~~button mashing~~ testing. Got Lau Chan to execute a throw two more times, but didn't get any of the other characters to do a special move with the Guard + Punch combo. Still not sure why that combo worked the three times that it did, but didn't work the hundreds of other times I tried it. Button press synchronization? (I could jumper both button inputs together to eliminate this as a possibility) Button press length? Timing? Range? Hopefully someone who has access to a Virtua Fighter PCB and can consistently pull off these special moves can make a recording of the screen and button press timing for the moves on PCB vs. MAME or at least let us know if it works as well in MAME as it does on the PCB. Scott
No.23762 MetalGod Senior Tester 3 days ago	Is this a regression?
No.23763 PL1 Tester 2 days ago edited on: 2 days ago	Yes. It is a regression in 0.217. I'm getting the same results as above with 0.273, 0.262, 0.238, and 0.217. NOTE: Of the versions tested, only 0.217 throws a ROM checksum error when launching from MAME's UI -- it will still run from command line. With 0.216, I can pull off the Guard + Punch special move fairly consistently with all of the characters mentioned above. Scott P.S. The Akira Yuki special move mentioned above is NOT triggered by Guard + Punch. Select Jacky Bryant, Sarah Bryant, Lau Chan, Pai Chan, Kage-Maru, Wolf Hawkfield, or Jeffry McWild to trigger a special move with that button combo.
No.23765 MetalGod Senior Tester 2 days ago edited on: 2 days ago	I think this is related with that TGP emulation introduced in mame 0.217. It corrected some stuff like the hair in the fighters... but it broke collisions. This was never fixed. I read from the devs that the tgp needed to be hooked up or something like that.