Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08368 Speed Major Always Jul 4, 2022, 12:56 Sep 8, 2022, 16:38
Tester sasuke View Status Public Platform MAME (Official Binary)
Assigned To Resolution Unable to reproduce OS Windows 10/11 (64-bit)
Status [?] Closed Driver
Version 0.245 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 08368: phantasm: Game speed is always half
Description The speed during game play is always half.
It does not seem to happen in other cloned versions.
Steps To Reproduce
Additional Information
Github Commit
Regression Version
Affected Sets / Systems phantasm
Attached Files
mp4 file icon phantasm_arcade64.mp4 (2,223,681 bytes) Jul 4, 2022, 15:17 Uploaded by sasuke
Playing Arcade64 0.245 (NOTE: this is not official binary)
There are no relationship linked to this issue.
User avatar
Jul 4, 2022, 13:00
This occurs only with Arcade64 and not with Official Binary.
Please close this.
User avatar
Jul 4, 2022, 13:09
I tried phantasm and avspirit and they both seem to react/play similarly for me.
Perhaps you can explain where you see this speed issue and how others would be able to observe this?
I'd also try running with a fresh configuration for that game and see if that fixes it. (delete/remove game or driver .cfg/.ini)
User avatar
Jul 4, 2022, 15:17
As I mentioned in my comment above, this only occurred with Arcade64, the unofficial build.
Since it did not occur in official binary, you may close the ticket. I’m sorry.

Arcade64 is here.

In addition:
It occurs even after deleting cfg and ini, and the cause is unknown.
To play at its true speed, the maincpu must be overclocked by 200%.
I am attaching a video to show what I am talking about.
User avatar
Jul 4, 2022, 22:38
Yes. In the future to save our time and your make sure you can duplicate such issues with the approved integer binary.
As I understand, there is a forum which you can talk arcade64 - I'd suggest you bring it up over there.

User avatar
Senior Tester
Sep 8, 2022, 16:38
Probably a good idea to let me know about these... only just found this report.

A check of megasys1.cpp revealed a hack by the previous maintainer. I don't know what purpose it served, but it's been removed now and phantasm runs at the same speed as in MAME.