>Well, any 32-bit OS can only address 4294967296 bytes (4096 Mb) of
>total memory (2^32) per process.

True if it's simple register addressing.  But RS/6000 systems are more
complex, utilizing segment registers which add 24 bits to the 28 bit offset
in the addressing register, for a composite 52-bit virtual address.
It makes me glad that the days of assembler language programming are gone!
    Richard Sims, BU