Multiply Subroutine

This document is an interoffice memorandum from Digital Equipment Corporation's Computer Division, dated January 19, 1961. It provides details and assembly code for a multiply subroutine designed for the PDP-1 computer. The document outlines two calling conventions: 'mpy' for a 34-bit product and 'i-mpy' for a 17-bit product. An acknowledgment notes that this library subroutine was authored by Bolt, Beranek and Newman in Cambridge, Massachusetts.