RE: PDD 4, version 1.2.

[NeonEdge]

Here's a reference to the Bartlett 'mostly-copying' GC collector.
ftp://gatekeeper.dec.com/pub/DEC/WRL/research-reports/WRL-TR-88.2.pdf
Hans Boehm also has a decent GC reference page with links to Bartlett's, but
his GC is mark/sweep.
http://www.hpl.hp.com/personal/Hans_Boehm/gc/index.html
Grant M.