Advanced Micro Devices said its losses in the quarter ended Dec. 28 deepened from the year-ago period even though sales rose 4%, to $150.2 million from $144 million a year ago. The Sunnyvale, Calif., chip maker lost $10.7 million in the 1985 quarter. The company said, however, that it was beginning to see during the quarter results of a cost-reduction program begun in the second quarter. For the nine-month period, AMD's losses totaled $92.5 million, including an extraordinary second-quarter charge of $19.9 million related to the cost-reduction programs. That compared to a $25.3-million loss in the first nine months of fiscal 1985.