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Why did IBM skip "System/380" as a mainframe family name?

If you have a look at the announcements for the various System/XXX machines you mention, you'll notice a pattern: System/360, April 1964. System/370, June 1970. System/390, September 1990. Comments ...
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3 votes

Did the IBM 7030 "Stretch" influence the design of PL/I?

TL;DR: The IBM 7030's fixed-point arithmetic model was unusual: binary numbers could have any number of bits from 1-64. Similarly, PL/I's FIXED BINARY data type has a variable number of bits. ...
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