(a) Supreme CourtA majority of the Supreme Court shall be a quorum of the court.(b) Other courtsThe quorum requisite to hold a session of any other court shall be specified by general rule.(c) Inability to assemble quorumWhere by reason of vacancy, illness, disqualification or otherwise it is impossible to assemble a quorum of a court at the time and place appropriate therefor, sufficient judges shall be temporarily assigned to the court to permit the court to hold a duly convened session and transact the business of the court.(d) Court en bancThe composition of a court en banc shall be as specified by general rules.1976, July 9, P.L. 586, No. 142, § 2, effective 6/27/1978.