07052: macplus [bdrkcast]: Performance and sound issues with macplus

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07052	Gameplay	Major	Always	Jul 24, 2018, 18:57	Mar 26, 2021, 07:49

Tester	shoegazer	View Status	Public	Platform	MAME (Self-compiled)
Assigned To	Lord Nightmare	Resolution	Fixed	OS	Linux (64-bit)
Status [?]	Resolved			Driver	apple/mac128.cpp
Version	0.199	Fixed in Version	0.230	Build	64-bit
		Fixed in Git Commit	ee3ad3a	Github Pull Request #

Summary	07052: macplus [bdrkcast]: Performance and sound issues with macplus
Description	This software list title (bdrkcast) runs too slowly on the macplus driver with scratchy audio, and the game is basically too sluggish to be playable as a result. I've also observed these issues on other non-software list titles such as Dark Castle 1, leaving me to believe it is a system-wide issue rather than specific to any given title. This is the best footage I could find to illustrate how the game should actually run, i.e. without the above issues. Note that this footage may have come from a different emulator such as vMac, though I can confirm it's more accurate to the way it should be run given that I've frequently played this game and its predecessor on an actual Mac Plus.
Steps To Reproduce	Launch MAME with macplus and bdrkcast from the software list, hit space at the title screen, click "Play" and wait for it to go ingame (it will take a while). Use mouse to move player's arm up and down, mouse button to click, and WASD to move. From that point the speed, sluggishness and audio issues should be apparent and distinct from those of the above video.
Additional Information	While I can't confirm this has never worked properly in MAME, I've been tracking this issue since before MAME and MESS merged, and shortly after the old mac drivers themselves were added iirc.
Github Commit

Flags
Regression Version
Affected Sets / Systems	macplus [bdrkcast]

Attached Files