Lockheed’s CalComp unit is to sell its systems division to Isicad AG of Ellwangen, Federal Republic of Germany, for an as yet undisclosed amount. The computer-aided design systems business sells the Cadvance line of MS-DOS software and System 25 series of Unix-based interactive graphic design systems, and represents under 10% of total revenues. CalComp says it wants to concentrate its resources entirely on its computer graphics peripheral units.