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Viewing Issue Advanced Details
ID | Category [?] | Severity [?] | Reproducibility | Date Submitted | Last Update |
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05962 | Sound | Major | Random | Jun 10, 2015, 16:33 | 14 days ago |
Tester | darq | View Status | Public | Platform | MAME (Self-compiled) |
Assigned To | darq | Resolution | Fixed | OS | Windows Vista/7/8 (64-bit) |
Status [?] | Resolved | Driver | |||
Version | 0.162 | Fixed in Version | 0.273GIT | Build | |
Fixed in Git Commit | 63bb767 | Github Pull Request # | |||
Summary | 05962: gotcha: Music suddenly stops | ||||
Description |
Music hangs at random points. Just play the game for a while, or press the fast forward key during a level. After a fast investigation, I found that the cause is the audio CPU NMI. I think that NMI is useless and also harmful. It causes 0xC00F reads (as noted in the source) and it expects an opcode there, so if you always return 0x00 = NOP instr. for example, the CPU reads/writes at 'strange' locations after a while. I also compared the audio CPU with silvmil that is a similar hw (PS: Isn't a good idea to merge gotcha with silvmil? ;)) and silvmil doesn't need an NMI. |
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Additional Information | |||||
Github Commit | |||||
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Affected Sets / Systems | gotcha | ||||
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Relationships
There are no relationship linked to this issue. |
Notes
3
No.11748
Tafoid Administrator
Jun 10, 2015, 23:39
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Confirmed the state of occasionally stalling music and not the reason listed above. |
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No.11750
darq Tester
Jun 11, 2015, 05:25
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Can I ask why you cannot confirm the NMI's fault? If my assumptions are wrong, I'd like to know why :-) Thanks. |
No.11751
Mamesick Senior Tester
Jun 11, 2015, 07:19
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darq assumptions are right, 0xC00F location in the sound map should be enabled. Then there are two possibilities: 1) still mantain the NMIs and correctly emulate what happens there. 2) fill the location with AM_WRITENOP and then remove the NMIs from MACHINE_CONFIG since they are nested. (this is already done in the mentioned SILVMIL.C driver) I'm stunned that there's request and research of new contributors and still read answers like this. |