Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
02534 Graphics Minor Have not tried Oct 12, 2008, 18:41 16 days ago
Tester Smitdogg View Status Public Platform MAMEUI
Assigned To Resolution Bugs That Aren't Bugs OS Windows XP/Vista 64-bit
Status [?] Resolved Driver djboy.cpp
Version 0.127u7 Fixed in Version Build 64-bit
Summary 02534: djboy: [possible] Graphics glitch with the briefcase at the beginning of the 2nd level
Description Near the beginning of level 2, an enemy throws briefcases at you. The briefcase graphic occasionally flickers on then off for a frame or 2 in places that it shouldn't. I don't know if it's a bug in the real game or not. Also there may be other places where this happens with other graphics. I attached an inp that will take you through this level.
Steps To Reproduce
Additional Information
Flags Possible
Regression Version
Affected Sets / Systems djboy
Attached Files
zip file icon djboy.zip (225,733 bytes) Oct 12, 2008, 18:41
png file icon 0005.png (8,036 bytes) Oct 12, 2008, 20:34
png file icon 0006.png (8,011 bytes) Oct 12, 2008, 20:34
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Notes
5
User avatar
No.02793
Tafoid
Administrator
Oct 12, 2008, 20:33
Made snaps from the INP - one when the case appears in the wrong place, then again after it shows where is should.
User avatar
No.06484
hammad
Tester
Aug 3, 2010, 11:00
does this happen in 139 after the mcu is properly emulated ?
User avatar
No.06485
Smitdogg
Moderator
Aug 3, 2010, 12:51
Yes.
User avatar
No.06486
Haze
Senior Tester
Aug 3, 2010, 13:29
it's an interrupt timing issue I think, the driver currently toggles 2 interrupts with even spacing when in reality they should probably relate to specific points in the screen (vblank in/out maybe)

this causes the spritelist to be updated at the wrong point, and the glitches to occur. If you simply swap them over you get very jerky video update instead.

it could of course happen to an extent on the real PCB, as it does on B.Rap Boys, but still, the current interrupt timing is a hack.
User avatar
No.15830
MetalGod
Tester
17 days ago
Very brief appearance of the suitcase out of place in the arcade pcb too:
8:42