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Luke,

Long before EVAL, there was (among others) an ADD operation code. So, you
could either ADD a value to an existing value, without clearing it first, or
use Z-ADD, that meant something like "ZERO" first the variable and THEN add
the new value. It went something like this:


Z-ADD 5 VAR
** (VAR now has 5)
ADD 10 VAR
** (Var now has 15)

etc.

HTH,

Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries
--



On Thu, Mar 24, 2011 at 8:47 AM, Luke Gerhardt <lgerhardt@xxxxxxxxx> wrote:

Since it was mentioned here and tickled a neuron...I might as well ask:
I've always wondered, what is the purpose of Z-ADD? Isn't it just the
same to EVAL = 0, or EVAL = whatever you really want it to be? Or is
this just a legacy leftover that only still exists in order to mess with
my mind?

Thanks! :)
--
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