[email protected] (David L. Craig) writes: > Does anyone else (Google doesn't) remember the ELHO acronym? > > Equal - mask '8' > Low - mask '4' > High - mask '2' > Overflow - mask '1' > > Back in the days of no extended mnemonic opcodes it was > quite the assembler programming aid.
I was involved in doing some of the original relational/sql "System/R", some past posts http://www.garlic.com/~lynn/submain.html#systemr where SQL does 2-value, true/false logic. It created big problem for unknowns and/or null values. Old discussion that null values in SQL tended to produce the opposite of the expected results ... making it all the more dangerous. about the same time, I was brought in to do some of a different kind of relational implementation ... which had interface language that directly supported unknowns/null with 3-value logic. old post in DBMS group discussing the dangers of unknowns/nulls in SQL and how it was handled in 3-value logic http://www.garlic.com/~lynn/2003g.html#40 How to cope with missing values - NULLS? http://www.garlic.com/~lynn/2003g.html#41 How to cope with missing values - NULLS? Earlier in the first part of the 70s, I had written a PLI program to ingest assembler listing ... analyze the statements, creating higher level representation ... code paths, logic processes, "dead" code, possible register use before set, etc ... and generate representation using a psuedo-pascal statements. some highly optimized cp67 kernel tmade liberal use of 3&4-way logic with branch conditions and would appear very straight forward ... the psuedo-pascal true/false if/then/else type logic could look very convoluted with nesting that could go 15-levels deep. iefbr14 https://en.wikipedia.org/wiki/IEFBR14 got fixed with SR, then with eyecatcher name, also a couple other nits, "IEFBR14" on "END" statement, and "RENT" & "REUSE" in linkedit http://hercules390.996247.n3.nabble.com/IBM-program-naming-question-td27674.html from above: Two more ... First, because the RENT linkedit option wasn't specified. Second, because the REUSE linkedit option wasn't specified. ... snip ... -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
