| ID | Category [?] | Severity [?] | Reproducibility | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 06494 | Graphics | Minor | Always | Feb 4, 2017, 15:24 | Jun 19, 2024, 11:45 |
| 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 | |||||
| Flags | |||||
| Regression Version | |||||
| Affected Sets / Systems | thndrbld, thndrbld1, thndrbldd | ||||
|
Attached Files
|
 0000.png (76,624 bytes) Feb 4, 2017, 15:24 Uploaded by Yonah | ||||
 no_heli_and_some_other_sprites.jpg (212,536 bytes) Jun 19, 2024, 11:45 Uploaded by hap | |||||
 No.13594
B2K24 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. |
|---|---|
 No.21289
Cow Tester
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. |
 No.22194
hap Developer
Jun 19, 2024, 11:42
edited on: Jun 20, 2024, 10:17
|
thndrbld1 appears to be less glitchy than the parent set? Fiddling with IRQ emulation or changing CPU interleaving(quantum) does not have any effect. This is not conclusive proof that it's a BTANB, but on this arcade cabinet video of what appears to be a PCB with FD1094, the sprite glitch happens at around the same time as on MAME's unprotected thndrbld1: I'll attach a screenshot. *edit* Ah, this specific glitch does not go away if I overclock the subcpu, so it's not the same as the glitch reported by Yonah |