NY -- Standard&Poor's CreditWire 11/23/1998 -- Standard&Poor's today affirmed its ratings on Tyco International Ltd. and related entities (see list below). The outlook is stable. At the same time, Standard&Poor's affirmed its ratings on AMP Inc. and revised the CreditWatch implications to positive from developing. The affirmations followed the announcement that the two companies have agreed to merge in a tax-free stock-for-stock transaction, subject to shareholder and regulatory approval. The transaction is expected to be accounted for as a pooling of interests. The revision in CreditWatch implications on AMP is based on the potential for improved credit quality if the transaction is completed as currently structured. Harrisburg, Pa.-based AMP, with annual revenues of about