CN18 - jumper set on Pins 1 & 2
CN16 - jumper open
CN11 - jumper set on Pins 2 & 3
CN7 - jumper set on Pins 1 & 2
AFAIK, CN16 is (seems like) an option which made A530 drain power from A500. GVP might been pushing for that option, but cancelled due limited amperage available through 100-pin edge connector.
