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|ID||Category||Severity||Reproducibility||Date Submitted||Last Update|
|0000025||[ParaJVE] Emulation > Timings||minor||always||2009-11-03 14:34||2009-11-04 20:39|
|Summary||0000025: Bedlam runs way too fast|
ParaJVE has some speed timing issues, nonetheless, the games usually remain playable.
An exception is Bedlam, that runs much too fast to be played correctly.
|Tags||No tags attached.|
|Cartridge||Bedlam, Cosmic Chasm, Hyperchase, Rip Off, Star Trek, Tour de France, Polar Rescue|
edited on: 2009-11-04 10:05
The emulator detects end of frames using the 6522 T2 timer. After each end of frame, it waits for a specified delay, in order to achieve a constant framerate.
So far, we made the assumption that the T2 counter was always set to 30.000 (which is the default for most of the existing games), but Bedlam does set this counter to 49407 ($C0FF). Hence, ParaJVE was running the game at 160% of its original speed.
Now that it has been fixed, the emulator computes the ratio (T2 value / 30000), and use this as a factor to multiply the initial delay to wait for the next frame.
edited on: 2009-11-04 10:04
After testing the patch against the whole set of ROMs, it appears that no less than 7 games were impacted by this bug. So the correction fixes all the 7 games.
Following is a list of these "non-standard" games, with the delay value they're using.
45000 ($AFC8) :
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