The demand for mainframe programmers
has been so great that Kirkwood has added an accelerated course that compresses two years worth of training into six months.
But, due to its reputation for robust security, many CIOs, CISOs and mainframe programmers
take z/OS security for granted, overlooking a crucial weakness: bad operating system code.
Because computer processing cycles were so expensive, mainframe programmers
of the 1970s and 1980s often converted the MMDDYY date into the shorter Julian format yyddd, which used the last two digits of the year and a number, between one and 365, indicating the number of days from January 1 to the date being represented (February 1, 1997, for example, translates as 97302).
The development software is so simple that none of the mainframe programmers
knows how it works.
Maintenance becomes even more of a burden, since there is usually a team of mainframe programmers
who redo the code and another team of PC programmers who change the "look and feel." This can be costly.