Yes, I cut my teeth in technical reading on the 370 PoPs manual (Principals of Operations). IIRC it was the authoritative assembler reference. Many IBM manuals had a distinctive turn of phrase for operations which would crash. I can't remember exactly what it was, but something like "results will be unpredictable".
Nothing starts your day quite like a 3:00AM call to come in and resolve an "Abend - S0C7".
In the Production Control Center (liason between operations and the programming organizations), we loved S0C7s because they were pretty much always program errors rather than difficult-to-diagnose hardware issues.
