Building on the success of the Mac II, the
1988 IIx housed a 68030 CPU and 68882 FPU (floating point unit) in
the same case. Breakthrough featured included the DOS-compatible
SuperDrive and virtual memory. Although advertised as a 32-bit
computer, the Mac IIx ROMS were "dirty," containing some 24-bit code.
Running in 32-bit mode requires
The IIx requires special PAL SIMMs when using 4MB or larger SIMMs.