BoB DISPLAY ADAPTER Assy. # 12-10078-xx There are no switches to set on BoB. Set the PC's motherboard switches for an 80-column color display. Jumper E1-E2 and E4-E5 for complete IBM Color/Graphics software compatiblity. Jumper E2-E3 and E5-E6 for 'flicker-free' operation.