One end of the DB9 framelock cable connects to the DB9 OUT port of the Sun XVR-1200 graphics accelerator designated as the master board. The other end of the DB9 framelock cable connects to the DB9 IN port of the second graphics board, designated as the first slave board. A second DB9 framelock cable connects to the DB9 OUT port of the first slave graphics accelerator and the other end of the DB9 framelock cable connects to the DB9 IN port of the second slave board.