to be precise : open a cli. type the command 'cpu'. >cpu datacache ==> Act LED Off >cpu nodatacache ==> Act LED On >cpu instcache ==> no change on Act LED >cpu noinstcache ==> no change on Act LED Turtle mode is linked to instcache. The 'Turtle' property enables a special feature of the core, that intends to improve compatibility with native Amiga games/demos or ProTracker-like programs, by slowing down the CPU to approximate the speed of a vanilla Amiga 1200 computer which is clocked at 14 MHz. Turtle mode does not change the behaviour of the CPU internal clock (eg. VP_CPU_Clock) but will insert waitstates into the pipeline. BlitSync mode is linked to datacache. The 'BlitSync' property enables a special feature of the core, that intends to improve compatibility with native Amiga games/demos, fixing as many graphics glitches as possible. This is done by disallowing writes to the blitter registers for a short time, after starting a new job. This feature do not slow down the program execution but synchronizes chipset blitting. Using WHDLOAD 'NOCACHE' will enable both modes, because NOCACHE will act as >cpu noinstcache nodatacache.
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