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sega/segas16b.cpp
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08065 Graphics Minor Always Aug 27, 2021, 10:50 Sep 3, 2021, 17:16
Tester abelardator2 View Status Public Platform MAME (Official Binary)
Assigned To hap Resolution Fixed OS Windows 10 (64-bit)
Status [?] Resolved Driver
sega/segas16b.cpp
Version 0.234 Fixed in Version 0.236 Build 64-bit
Fixed in Git Commit f686bcd Github Pull Request #
Summary 08065: altbeast, altbeast6: Random graphics flickering
Description Sets (altbeast, altbeast6) using 8751 get random graphics flickering. (Sprites)
(altbeastj) it also uses 8751, but this does not happen.
Steps To Reproduce
Additional Information
Github Commit
Flags Noted in Source
Regression Version
Affected Sets / Systems altbeast, altbeast6
Attached Files
  
Relationships
related to 01852Confirmed  fantzone, fantzone1: Graphical glitch of the background at the beginning of the game. 
Notes
5
User avatar
No.19183
Fujix
Administrator
Aug 29, 2021, 03:13
 I played through the 1st stage but couldn't find the problem.
Could you point out where / when do you get the flicker?
User avatar
No.19185
StHiryu
Tester
Aug 29, 2021, 08:06
 I can confirm this on my MameUI 234. The bug happens randomly, most of time when you hit enemies.
User avatar
No.19186
abelardator2
Tester
Aug 29, 2021, 12:25
 The problem is most evident in stage 3.
User avatar
No.19221
hap
Developer
Sep 3, 2021, 15:01
 It is caused by: m_screen->set_video_attributes(VIDEO_UPDATE_AFTER_VBLANK);
This was added to work around https://mametesters.org/view.php?id=1852
User avatar
No.19224
Haze
Senior Tester
Sep 3, 2021, 17:16
 note, there are also issues with the 8751 hookup however, where other workarounds are being used to stop the CPUs fighting which was causing some of the games to randomly reset. might be the 8751 has bus priority and can pause the 68k entirely.