Unisys Corp. announced technology agreements with American...

Unisys Corp. announced technology agreements with American Telephone & Telegraph Co. and Sun Microsystems Inc. Unisys said the agreements would bolster its use of Unix, a computer operating system or “traffic cop” that was developed by AT&T; and is gaining popularity among commercial computer users. In addition to working with AT&T; to enhance Unix, Unisys said it was licensing a computer chip design from Sun Microsystems, known as Sparc, that would be used in future Unisys computers running Unix. Unisys, based in New York, is the world’s third-largest computer company.