TN.261.Cache As Cache Can - This Technical Note documents some new traps for manipulating the data and instruction caches on 68030-based Macintosh models and describes the MMU mapping set up by the ROMs for NuBus™ cards. The Motorola MC68030 CPU used by the Macintosh IIx, IIcx, IIci, and SE/30 includes a data cache, an instruction cache, and a MMU (Memory Management Unit). This Note describes the problems that data caching can cause, Apple’s solution to this problem, and additional information about MMU mapping on MC68030-equipped machines.
