I think it may be because of a sideloaded app. That does seem like a more reasonable thing to warn about.
40,918 karma · joined June 16, 2019
Tel Aviv, Israel / St. Charles, Missouri
This seems suboptimal.
He started talking aobut Objective-C and how it was 10x more productive than other programming languages and how easy it is to write good applications quickly with it. Someone shouted out the question: "If it's so easy and fast to write applications, where are all the NeXT killer apps?" There was no good answer....
XR 15,15 XOR REGISTER 15 WITH REGISTER 15
vs L 15,=F'0' LOAD REGISTER 15 WITH 0
This was alleged to be faster on the 370 because because XR operated entirely within the CPU registers, and L (Load) fetched data from memory (i.e.., the constant came from program memory).