Ok. Been on Diycnc. looked at V3 also looked at OPPBV2 Paralell board. This lookes useful as it has Usb. I assume this takes place of buffer. I should be able to link this to existing driver boards and V3 using existiing psu, plug in a usb computer and suitable software. ? I have Bobcad which I bought in a rash moment and never used. Am I on the right track ? Phil.