New rivals, bad bets, and “junkification”
Unknown: The 3277 didn't have a status line, but three status lights next to the display. It had 24 lines in total. The status line (Operator Information Area) was introduced in the 3278. This can be verified in the manuals, which are online at bitsavers. Also, 3270 emulation was not a requirement or goal for the IBM PC, and didn't lead to the 25th line. I would much prefer to have a tidy story where the 3270 led to the PC's display, but unfortunately that's not the case. I talked to two of the original IBM PC engineers to check on this. The said the IBM PC team felt absolutely no need to be compatible with other IBM products. In particular, several features of the PC made 3270 compatibility harder: the use of ASCII instead of EBCDIC, little-endian words, and 10 function keys instead of 12.
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This time, parameters x and y are used in the same order they are declared, so the substitution f() + other() + g() won’t change the order of effects of f() and g()—but it will change the order of any effects of other() and g(). Furthermore, if the function body uses a parameter within a loop, substitution might change the cardinality of effects.。谷歌对此有专业解读
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