Unisys Corp., which has extensive operations in Utah, reported losses for the fourth quarter and all of 1990 and predicted more red ink this quarter. But the troubled computermaker said there were signs its turnaround effort was taking hold.

Unisys, the nation's third-largest computer company, reported an $88.5 million loss in the three months ended Dec. 31, or 74 cents a share, after paying preferred stock dividends. That compares with a profit of $34 million, or 5 cents a share, in the same quarter of 1989.Fourth-quarter revenue totaled $2.93 billion, down slightly from $2.97 billion a year earlier.

For 1990, Unisys lost $436.7 million, or $3.45 a share, after paying preferred dividends, compared with a loss of $639.3 million, or $4.71 a share, in 1989.

Revenue for 1990 totaled $10.11 billion, up slightly from $10.1 billion in 1989.

"Overall, 1990 was a disappointing year for Unisys and one of continued difficult transformation of the industry," James A. Unruh, chairman and chief executive, said in a statement. "We are, however, encouraged by the progress we made in a number of key areas."