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ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
06494 Graphics Minor Always Feb 4, 2017, 15:24 Apr 7, 2023, 16:19
Tester Yonah View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows Vista/7/8 (64-bit)
Status [?] Confirmed Driver
Version 0.182 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 06494: thndrbld, thndrbld1, thndrbldd: Objects momentarily disappear
Description At certain times during the demo and gameplay, all of the objects on screen (buildings, trees, enemies, bullets, player's helicopter) will disappear for a single frame. This can be easily observed at 35 seconds into the game's demo mode. In a 5 second span there are 4 times when all of the objects disappear for a single frame, leaving only the background. Possibly not a bug with MAME but with the original hardware.
Steps To Reproduce
Additional Information If the SUBCPU is underclocked to 90%, the problem becomes more severe. If overclocked to 110%, the problem is resolved.
Github Commit
Regression Version
Affected Sets / Systems thndrbld, thndrbld1, thndrbldd
Attached Files
png file icon 0000.png (76,624 bytes) Feb 4, 2017, 15:24 Uploaded by Yonah
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Senior Tester
Feb 6, 2017, 05:59
I'll confirm this for now as I see the exact same thing as your snap shot when creating an AVI with MAME and cycling through it frame by frame with MPC-HC.
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Apr 7, 2023, 16:19
edited on: Apr 7, 2023, 16:21
Could possibly be that the SUBCPU's clock speed is wrong in MAME. Its more noticable in the Upright set than in the Cockpit/Deluxe revision. If anyone's got a good capture of a PCB, it would be greatly appreciated.