MSI Data Corp. said it has signed...

MSI Data Corp. said it has signed a $5.6-million contract to supply Unisys, the Detroit-based electronics company, with an unspecified number of its portable data terminals.

The Costa Mesa company said Unisys, until this week the Burroughs Corp., will arm its field technicians with the devices. The technicians will use them to exchange data with the company’s central computer when they make routine service calls on Burroughs computer equipment.