IBM AS/400
    IBM's proprietry minicomputer range. Early models were based on an
IBM CISC CPU. Current models have
    switched across to the Motorola PowerPC.

This is not true.. They use IBM only made PowerPC chips that have many
extra hardware extensions (the extra bit making them 65 bit processors
for starters... the AS/400 processors were never 32-bit).   Your
confusion may be that these processors can be put in PowerPC mode making
them hardware compatable with Motorola PPC.  IBM is now shipping these
processors in the high end RS/6000 servers in the 64-bit PowerPC mode.
I would not suspect you could get enough information on the AS/400
processors to make a port.  IBM considers the AS/400 processors
intellectual property.

Patrick Berge