Early Electronic Computing Developments at IBM

This article deals primarily with the early beginnings of electronic computer development within IBM. It starts with the 603 prototype (first operational in 1942) and goes on to cover the major IBM electronic developments up through the 701, including the 603, SSEC, 604, CPC, and tape processing machine. It also briefly outlines early work at RCA and at NCR, based on patents on file in the U.S. Patent Office and on the limited reports publicly available.