Televideo Systems Inc has a letter of intent to pay a total of $4m in cash for a 51% stake in veteran US government systems specialist Delta Data Systems. The Sunnyvale, California company looks for Delta to increase its volumes by adding Tempest radiation shielding to standard Televideo microcomputers and marketing them to the government. Tempest shielding is designed to suppress emissions from computers that might be detected and decoded by an eavesdropper. Under the pact Televideo would first exchange loss making Delta’s convertibles for $1m cash, and then buy shares to take it up to 51% in two tranches over five months. Televideo Systems can easily afford the acquisition – it is sitting on some $65m in cash.