nihon no minasan Region code
DVD DVD Region Hack #1
Here are the instruction how to play Region 1 (USA) DVD's on the PlayStation 2 in combination with System-Disc v1.00 (this CD comes with all Japanese PS2 systems which are sold before April 2000):
Hack #1:

Press & Hold the Circle, Right and L1 keys.
Hack #2:

Press & Hold L3 & push the stick in hard
Hack #3:

Boot into PS2 browser without a CD in the tray
Insert the Region 1 DVD you want to play
Press Circle and R1 on the DVD
Hold Right until menu appears
Press Circle and R1 again

NOTE: This hack only works on the first revision of the PS2 (SCPH-10000). It does not work on the newer SCPH-15000