Polymerase responsible for protein-primed viral DNA replication by strand displacement with high processivity and fidelity (By similarity). To start replication, the DNA polymerase forms a heterodimer with a free primer terminal protein (TP), recognizes the replication origins at both 5' ends of the linear chromosome, and initiates replication using as primer the OH-group of Ser-232 of the TP (PubMed:23110220). This polymerase possesses three enzymatic activities: DNA synthesis (polymerase), primer terminal protein (TP) deoxynucleotidylation, which is the formation of a covalent linkage (phosphoester) between the hydroxyl group of a specific serine residue in TP and 5'-dAMP, a reaction directed by the third T at the 3' end, and 3' to 5' exonuclease activity (PubMed:23110220, PubMed:19011105). Exonuclease activity has a proofreading purpose (By similarity). Since the polymerase initiates the replication on the third thymine, the TP-dAMP initiation product translocates backwards to recover the template information of the 2 terminal nucleotide (sliding back-mechanism) (PubMed:23110220, PubMed:19011105). a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) = diphosphate + DNA(n+1) Interacts with the primer terminal protein; this interaction allows the initiation of TP-primed DNA replication at both viral DNA ends. Interacts with DNA. The N-terminus contains the 3'-5' exonuclease activity and strand displacement ability. The C-terminus contains the protein-primed initiation, DNA polymerization and pyrophosphorolytic activities. This DNA polymerase requires a protein as a primer. Belongs to the DNA polymerase type-B family.