Allowed OS Upgrade table

Hi people

Is anyone aware of a simple table that shows (for all versions) which
version of the OS any particular version may be upgraded to ?

I've had a hunt on the web and in the redbooks and can find the specifics
for each release but wondered whether there was a resource that covered all
releases.

For those interested this was prompted by someone on a CISC box who is
finally taking the plunge and upgrading as part of a larger project. It
sparked my curiosity as to what jumps would have to be made if they truly
went the whole upgrade route (which they won't)

regards
Evan Harris