I've just uploaded dynamem.zoo to the library. You will need the DBUG
macro package from the Fish disks to compile it, otherwise just do the
obvious edits to remove the debugging macros, there are only a few lines
affected. The package is very reliable, I have used it on Amigas, Unix
System V boxes and Suns (in production code too). If you want further info
on how it works it is basically a generalization of the approach described
in the August 89 Dr Dobbs. Draw pictures. Good luck, hope its useful, it
has been for me.