Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
07734 Gameplay Minor Always 30 days ago 17 days ago
Tester vidpro1 View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10 (64-bit)
Status [?] Acknowledged Driver segag80v.cpp
Version 0.224 Fixed in Version Build 64-bit
Summary 07734: tacscan: Sega Gremlin Vector game Tac-Scan Playback almost 1/2 the normal game speed on the 3D 2nd level.
Description As of MAME 0.224 there is a new Universal Sound Board fix.
Not sure if this has anything to do with the Tac-Scan game speed being almost half the speed on the
2nd level. All other game levels are ok. I don't see the frame FPS counter dropping either,.
Steps To Reproduce Just play to the second 3D level and you will notice the slow down. After the second level the game speeds back up to normal speed.
Additional Information
Flags
Regression Version
Affected Sets / Systems tacscan
Attached Files
 
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Notes
6
User avatar
No.17920
Tafoid
Administrator
30 days ago
I did notice several games using the Universal Sound Board and the fixes therein in testing, many games show changed speeds from before. When I inquired about it possibly being some sort of regression I was informed that it was due to implementation of wait states to z80 memory accesses.

Now, if you can find authentic recording from actual PCB to verify that indeed the change in render or speed of presentation isn't correct, that would be something we can work with. In at least one sample game checked, Astro Blaster, it was observed the new presentation is much closer to what is shown in video.

&feature=youtu.be&t=1086
User avatar
No.17923
vidpro1
Developer
30 days ago
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No.17924
vidpro1
Developer
30 days ago
This video shows the speed perfectly.
User avatar
No.17925
vidpro1
Developer
30 days ago
edited on: 30 days ago
Astro Blaster right now is playing very slow because of the netlist sound system and will have to wait on that one as the sound system eats a lot of cpu cycles.
I'm very happy that it was done and will be perfect some day. That game does not use the Universal Sound Board.
User avatar
No.17927
Tafoid
Administrator
30 days ago
I was told it did - perhaps it is a device BASED on the implementation.
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No.17973
vidpro1
Developer
17 days ago
If you use the -cheat options and overclock the Main CPU Z80 to 150% level 2 becomes ok like the original pcb. The overclock doesn't affect the other levels. Obviously not the correct fix.