MODE32 adds 32-bit capabilities to Macintosh models that were capable
of supporting a 32-bit architecture, but whose ROM did not. It
effectively patches the ROM code in certain models of early 68020 and
68030 Apple Macintosh computers which were misleadingly advertised by
Apple to fully support 32-bit memory management. Despite the machines'
hardware being designed to support 32-bit mode, the lack of a 32-bit
Memory Manager in ROM forced these machines to run in 24-bit mode,
which crippled these otherwise high-end machines to supporting only 8
MB of RAM. Prior to licensing MODE32, Apple had been subject to many
complaints from individuals over the lack of 32-bit support.

Generally, 32-bit addressing is only needed when large amounts of RAM
are needed or when a piece of software requires it. Running
non-32-bit-clean software in 32-bit mode on any Macintosh can cause
crashes and data corruption. With MODE32 installed, holding down the
Esc key on the keyboard as soon as the machine is powered on causes
the system to run in 24-bit mode for the current session.

DL #1: MODE32 v7.5 (1994)
DL #2: same as #1, but expands with StuffIt Expander 4.0
DL #3: MODE32 v1.2 (1991)

See also
[Optima][1]

Compatibility
Architecture: 68k

Affected models:
? Macintosh SE/30
? Macintosh II
? Macintosh IIx
? Macintosh IIcx

WARNING
If you use MODE32 v1.2 with System 7.5, there may be SERIOUS file
corruption. If a copy of System 7.5 has been used with MODE32 v1.2,
you MUST install a fresh copy of the system software. After
reinstalling the system software, use MODE32 v7.5.

  [1]: http://macintoshgarden.org/apps/connectix-optima

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