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Old 01 October 2019, 09:45   #2
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 44
Posts: 23,503
More compatible:

68000 and 68010: adds emulation of prefetch pipeline and data address error exceptions (without more compatible only jump to odd address causes address error exception). Prefetch is needed by many copy protections and self-modifying code tricks.

68020+: adds prefetch and instruction cache emulation.

Cycle-exact = more compatible + cycle-exact specific new features enabled. Cycle-exact is not possible without prefetch emulation. (Instruction internal memory access order would change which would change timing)

Cycle-exact is much more CPU heavy than more compatible.
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