05725: contra and clones: Rolling mines behavior is inaccurate.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05725	Gameplay	Major	Always	Oct 12, 2014, 19:46	Apr 14, 2021, 23:18

Tester	Arkhound	View Status	Public	Platform	MAME (Official Binary)
Assigned To	furrtek	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	konami/contra.cpp
Version	0.154	Fixed in Version	0.231	Build
		Fixed in Git Commit	c1bf2b9	Github Pull Request #

Summary	05725: contra and clones: Rolling mines behavior is inaccurate.
Description	I noticed that while playing Contra on MAME, the rolling mines launched by certain enemy soldiers during the 3D base stages have a tendency to roll towards the lower right corner of the corridor. Yet, in all the gameplay videos on Youtube that have the game running on the actual PCB shows the rolling mines being spread out instead. Skip to 1:00. Skip to 1:40. Now here's Contra running on MAME (skip to 1:20) It's possible that the enemy A.I. behavior during the 3D stages might not be emulated correctly.
Steps To Reproduce
Additional Information	I played every Contra set currently emulated by MAME and the only version where the rolling mines behave differently is in Gryzor set 2 (gryzora), where the rolling mines will be directed towards the direction the player is standing. Gryzor set 2 seems to have other weird differences with the other sets (notably Bill and Lance "bleed" when they're killed while swimming in Stage 1).
Github Commit

Flags
Regression Version
Affected Sets / Systems	contra and clones

Attached Files	0000.png (17,454 bytes) Nov 9, 2014, 19:37 Uploaded by Augusto

No.11053 Tafoid Administrator Oct 12, 2014, 23:32	Without testing, I think of 2 possibilities: 1) Difficulty settings might be different from game to game 2) The MAME video shows 2 player simultaneous. Some games will increase difficulty when more players are playing. The moving barrels towards a certain person might be an indicator of this. Flagged as possible
No.11054 Arkhound Tester Oct 12, 2014, 23:45 edited on: Oct 12, 2014, 23:46	I played the main Contra set by myself in every possible difficulty setting (from Easy to Hardest) and the mines always roll towards the right corner.
No.11055 Tafoid Administrator Oct 12, 2014, 23:51	Fair enough.. just some thoughts before trying to confirm. I can confirm the observation that the barrels rolling at you in the 3D stage do not roll straight down on MAME (parent set tested).
No.11056 Arkhound Tester Oct 13, 2014, 00:04	All the versions of Contra seem to behave the same way except Gryzor Set 2. In Gryzor Set 2, the rolling mines (as well as the second wave of enemy soldiers in each corridor) always direct their aim at the player.
No.11235 Augusto Tester Nov 9, 2014, 19:32 edited on: Nov 9, 2014, 19:40	Have another strange detail in 3D stages with the rolling mines. See the image file 0000.png. If the player destroy the device that power off the eletricity allowing to progress to another scene and the player character jump exactly in moment that the device was destroyed have chance of lose an life if is in same horizontal line with the mines because the mines are destroyed, but the player character not is close with the mines. This is random.
No.12198 Arkhound Tester Nov 21, 2015, 20:12	I decided to revisit this report and noticed that the two roms unique to Gryzor Set 2 (g2.18a and g3.17a), which is the versions where the rolling mines act differently on MAME, are not named like the equivalent sets (which have names like i02.18a and i03.17a, j02.18a and j03.17a, k02.18a and k03.17a, ect.) Could it be some kind of modded version?
No.12206 Alex7 Tester Nov 24, 2015, 06:53	this game shows (NO GOOD DUMP KNOWN) when you audit it in the last versions of mame so maybe is not a bug but the rom itself
No.16787 MetalGod Senior Tester Aug 23, 2019, 20:07 edited on: Aug 23, 2019, 20:18	I think the "possible" flag should be removed in this report. This is a legit bug with evidence from several pcb videos. Another video of Luke Morse contra pcb. Yeah, the mines do not behave as in mame 2:09, 4:38, Another pcb here. Mines behaving the same as in the previous video in 1:42
No.16792 Fortuna Tester Aug 24, 2019, 06:31 edited on: Aug 24, 2019, 06:34	Checking this behaviour, enemies shoots to the right side too, including the mines, happen in all sets Other detail: Only happen when the enemies moves from right to left and shoots only to the right side, if the enemies moves of left to right, the enemies shoots ok Too happen: when the mines are shoots the bullets go the same direction PS: happend in all sets PS2: Not happen in NES/Famicom, the "3d" levels has the same detail from the mines and bullets (1 way direction and and follow bullets)
No.17056 MetalGod Senior Tester Oct 8, 2019, 20:42	This comparison video I've uploaded proves perfectly what Fortuna said in the previous message:
No.17059 AJR Developer Oct 10, 2019, 16:01	I suspect this problem may have something to do with not emulating the 007452 math chip.
No.18686 MetalGod Senior Tester Apr 13, 2021, 06:30 edited on: Apr 13, 2021, 06:30	Pull request to fix this by Furrtek: https://github.com/mamedev/mame/pull/7951