On Mon, 18 Nov 2019, Clem Cole wrote:
The cat was already out and poking around with the
publishing of: IBM
360 Principles of Operation, DOC A22-6821-0. The APL version of spec
just gave it more area to roam.
Yeah, I know about PrincOps; it went into excruciating detail, leading to
the observation that IBM manuals were designed to impress rather than
inform...
-- Dave