00744: quantum, quantum1: MAME slower than original PCB.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
00744	Speed	Major	Always	Feb 4, 2008, 02:40	Feb 7, 2008, 07:11

Tester	-Misc Reporters-	View Status	Public	Platform
Assigned To		Resolution	Fixed	OS
Status [?]	Resolved			Driver	atari/quantum.cpp
Version	0.55	Fixed in Version	0.115u3	Build
		Fixed in Git Commit		Github Pull Request #

Summary	00744: quantum, quantum1: MAME slower than original PCB.
Description	Not entirely sure what causes this, but I verified that MAME emulates Quantum (both revisions) a bit slow as compared to the original PCB. (I played two separate Quantum machines this weekend at California Extreme.) It seems to be a difference of about 10-20% - the place I notice the difference the most is in the death sequence: * Hit an object: Buzz + "Charging Up" sound * All objects scale in with the collision point as center * Dots scale out from center point + 2 explosion sounds, one after the other. The amount of time between each of these points is between 10% and 20% shorter on the original PCB as opposed to the emulator. MAME doesn't indicate any performance problems and shoots up past 500% when I hit F10, so I know that it is not a MAME performance issue. My guess as to this issue is that there's a small timing inaccuracy in the emulator core.
Steps To Reproduce
Additional Information	Posted by Dorsola
Github Commit

Flags
Regression Version
Affected Sets / Systems	quantum, quantum1

Attached Files