| ID | Category [?] | Severity [?] | Reproducibility | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 06046 | Speed | Major | Always | Oct 17, 2015, 07:05 | Jan 21, 2016, 22:40 |
| Tester | r09 | View Status | Public | Platform | MESS (Official Binary) |
| Assigned To | crazyc | Resolution | Fixed | OS | Windows Vista/7/8 (64-bit) |
| Status [?] | Resolved | Driver | |||
| Version | 0.166 | Fixed in Version | 0.170 | Build | Normal |
| Fixed in Git Commit | Github Pull Request # | ||||
| Summary |
 06046: Several drivers using mc6845.c: Speed is always 90-98% when throttled |
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| Description |
The affected systems always run between 90-98% speed and never reach 100% when throttled. This also causes sound "crackling" problems. They run unthrottled at 200-800% speed on a "Haswell" Core i7, so CPU doesn't seem to be the limiting factor. Running them with "-video none" doesn't change the behavior. Tested in Windows 8.1 and 10, with both 32 and 64-bit official builds. This behavior seems to have been introduced with MESS 0.154, but still exists in 0.166. The MC6845 seems to be the only thing in common between the affected drivers, but there are other drivers using it that don't show that behavior. Tested drivers that show this behavior: x1.c wangpc.c trs80m2.c smc777.c abc80x.c Tested drivers that DON'T show this behavior: svi318.c amstrad.c bbc.c kaypro.c mbee.c bml3.c multi8.c |
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| Steps To Reproduce | Run any system in the affected drivers with the -throttle option on, and check the speed. | ||||
| Additional Information |
Test results: MAME 0.166: D:\mame>mame64 abc802 -video none -str 20 abc p2-1.2g NOT FOUND (NO GOOD DUMP KNOWN) (tried in abc802 abc802) pal16r4.2a NOT FOUND (NO GOOD DUMP KNOWN) (tried in abc802 abc834) WARNING: the machine might not run correctly. Average speed: 98.88% (19 seconds) D:\mame>mame64 abc802 -video none -str 20 -nothrottle abc p2-1.2g NOT FOUND (NO GOOD DUMP KNOWN) (tried in abc802 abc802) pal16r4.2a NOT FOUND (NO GOOD DUMP KNOWN) (tried in abc802 abc834) WARNING: the machine might not run correctly. Average speed: 818.91% (19 seconds) D:\mame>mame64 trs80m2 -video none -str 20 65-1991.z4 NOT FOUND (NO GOOD DUMP KNOWN) (tried in trs80m2 trs80m2kb) WARNING: the machine might not run correctly. Average speed: 98.53% (19 seconds) D:\mame>mame64 smc777 -video none -str 20 i80xx NOT FOUND (NO GOOD DUMP KNOWN) (tried in smc777 smc777) WARNING: the machine might not run correctly. System FF W 11 Interlace off System FF R 02 System FF W 01 System FF W 01 System FF R 01 Color FF 07 Interlace off Average speed: 96.79% (19 seconds) D:\mame>mame64 wangpc -video none -str 20 Average speed: 96.27% (19 seconds) D:\mame166>mame x1 -video none -str 20 80c48 NOT FOUND (NO GOOD DUMP KNOWN) (tried in x1 x1) ank.fnt ROM NEEDS REDUMP WARNING: the machine might not run correctly. Average speed: 94.14% (19 seconds) ---- MESS 0.153: D:\mess153>mess x1 -video none -str 20 80c48 NOT FOUND (NO GOOD DUMP KNOWN) (tried in x1 x1) ank.fnt ROM NEEDS REDUMP WARNING: the system might not run correctly. Average speed: 100.00% (19 seconds) ---- MESS 0.154: D:\mess154>mess x1 -video none -str 20 80c48 NOT FOUND (NO GOOD DUMP KNOWN) (tried in x1 x1) ank.fnt ROM NEEDS REDUMP WARNING: the system might not run correctly. Average speed: 92.99% (19 seconds) |
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| Github Commit | |||||
| Flags | |||||
| Regression Version | 0.154 | ||||
| Affected Sets / Systems | Several drivers using mc6845.c | ||||
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Attached Files
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 No.12077
kazblox Tester
Oct 17, 2015, 22:52
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When using Sharp X1 (x1) when throttled I got 63% to 80% with video as of MAME 0.166. |
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 No.12080
Tafoid Administrator
Oct 19, 2015, 23:16
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Regression traces to single line change which was supposed to fix some rather bad behavior in screen with borders: https://github.com/mamedev/mame/commit/0fd90ee5f59b73c32d2a1e71f5560fd150b0f6ab - July 7, 2014 |