3. Most games do work with HDL look here for a list of supported games
http://homepage.ntlworld.com/casey.m...patibility.htm
4. HDL wont work with the first 3 JAP PS2 models SCPH 10000, SCPH 15000 and SCPH 18000. These models are referred to as V0's. HDA is just a rip off of HDL so no it wont work either. I dont think those models even have a expansion bay for the network adapter do they? They had that external HDD didnt they? I once saw some Japan's producer that was promoting a HDL type of disc that would work with your version PS2 and I believe you had to use the official external Sony HDD. If I come across a link I will post it.
Look here for what HDD's will work with supported PS2's and HDL
http://ps2drives.x-pec.com/
No, HDL wont work with PSX games.