04119: twincobr and clones: Freeze game of twincobr sets

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
04119	Crash/Freeze	Critical (emulation)	Always	Nov 12, 2010, 17:46	Nov 16, 2010, 08:33

Tester	sadole	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Invalid report	OS	Windows XP (32-bit)
Status [?]	Closed			Driver	toaplan/twincobr.cpp
Version	0.140	Fixed in Version		Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	04119: twincobr and clones: Freeze game of twincobr sets
Description	To playing ktiger or twincobr set, the problem occured at middle of stage 2. The games freezed and the way for solving the problem is only in the exit of mame.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	twincobr and clones

Attached Files

No.06859 Tafoid Administrator Nov 12, 2010, 18:19	Please make an .inp file (-record twincobr.inp) of a gameplay for twincobr where this happens and compress and add to this report.
No.06860 ShimaPong Tester Nov 13, 2010, 06:49	I confirm the game freeze in Stage 2 with specified case. But... THIS IS DUE TO IN-GAME ROM CHECK ERROR, like Tiger Heli! The following is one of in-game ROM check routines in ktiger (I find 3 different routines at least but I think there is more) 025604: 41F9 0003 14DE lea 4de.l, A0 02560A: 2250 movea.l (A0), A1 02560C: 3019 move.w (A1)+, D0 02560E: 9059 sub.w (A1)+, D0 025610: C0D9 mulu.w (A1)+, D0 025612: D059 add.w (A1)+, D0 025614: 2089 move.l A1, (A0) 025616: D168 0004 add.w D0, (,A0) // Does Finished Check All Addresses? 02561A: B3FC 0002 FFF8 cmpa.l #fff8, A1 025620: 6614 bne 636 // Compare Check-sum 025622: 3029 0006 move.w (,A1), D0 025626: B068 0004 cmp.w (,A0), D0 02562A: 6706 beq 632 // Error! 02562C: 4E70 reset 02562E: 6000 A9D0 bra 000 // No Error; Reset Current Address and Calculated Value 025632: 4298 clr.l (A0)+ 025634: 4250 clr.w (A0) 025636: 4E75 rts Also I confirm it is passed without any error if don't use any cheat or fix a value via the debugger.
No.06861 Haze Senior Tester Nov 13, 2010, 08:46	so there is no bug, this is caused by cheats?
No.06862 ShimaPong Tester Nov 13, 2010, 14:13	Original poster loses very important info, "Used cheat or not" so that I can't say "this is expected caused by a hack" right now. But we know stephh's invalid report (also he has lost "used cheat" at first time!) in Tiger Heli and this case is very similar. And it is fact that this game has in-game ROM check and first action (reset or continue) after verify a value happens at Stage 2. Anyway, we are waiting for an answer by original poster.
No.06863 Fujix Administrator Nov 13, 2010, 15:08	Reminder sent to: sadole sadole, we need very important info for your twincobr bug report, whether you used a cheat or not. Please visit mametesters and clarify it, otherwise we have to spend time to confirm your report which might be invalid.
No.06866 Tafoid Administrator Nov 14, 2010, 20:28	Acknowledging until more research is done and original tester comes back and comments.
No.06867 Fujix Administrator Nov 15, 2010, 06:14	This reporter is a Japanese and I sent a message in Japanese as well as the reminder above two days ago. No reply yet and probably we can close this report.