Interesting idea on asking for the boards unassembled, since that would give me all the parts. anyway, i'll work more on this once i have the pcb's, the ones i found in the uk are cheap enough for me to do initial testing.

How it is terminated is tieing 5v to the scsi lines through either 110ohm or 150ohm resistors (depending on if i'm using smd's or repacks, so in the case of these it will be 150ohm) plus 2 diodes (i'm using 1n4001's)

I did initially try using a 3.3v voltage regulator but just couldn't ever get it to work

i'll build a quick one using the active termination method at the weekend and see if i can get it working.