Delete comment from: Ken Shirriff's blog
As an ex-IBMer (40 very happy years) who started with the 1401 and 360/30 in 1970 I’d just like to point out one factual error ... we never “booted” a 360 (or 370 later) ... we I...P...L...ed or re-IPLed the system. The IPL record was placed upon Cylinder 0 Track 0 of the IPL device which the channel program read when the IPL button was pressed.
Although it was also possible to IPL from a deck of punch cards (typically 00C), paper tape (typically 007), or magnetic tape (typically 181), if you needed to perform some maintenance on the system disk.
The expression Boot was not used until the part of the system disk from which the system was started was contained in a Boot Sector which came about in 1981 with the IBM PC [although it’s possible that the term Boot was used in IBM office products ... a part of IBM with which I had no familiarity].
Nov 9, 2019, 4:54:48 AM
Posted to Iconic consoles of the IBM System/360 mainframes, 55 years old