Kenneth Meyer's formulation <begin extract> I, among many, have to support older versions of the mainframe. This means using common instructions rather than the latest instructions. </end extract>
is admirably clear and succinct. Its only defect is that it is wrong. If instruction INST is not available on some of the machines he must support he can write a macro definition called INST that mimics its behavior for use on these antediluvian machines, do very much the same thing IBM does for millicoded instructions, albeit somewhat less elegantly. John Gilmore, Ashland, MA 01721 - USA
