What Is The Significance Of Above The Line And Below The Line
Before IBM introduced MVS/XA architecture in the 1980?s a program?s virtual storage was limited to 16 Megs. Programs compiled with a 24 bit mode can only address 16 Mb of space, as though they were kept under an imaginary storage line. With COBOL II a program compiled with a 31 bit mode can be ?above the 16 Mb line. (This ?below the line?, ?above the line? imagery confuses most mainframe programmers, who tend to be a literal minded group.)
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