<snip>
I believe when Walt raveled this fiber of the thread he posited assembler
CALL macro or JCL PARM format (they're the same.)
</snip>

I think of those two as not the same when both the parameter list and the 
parameter are considered.
If you pass a single parameter via CALL, then the parameter list consists 
of a single word (optionally with the high bit on) which has the address 
of the parameter, and the parameter is the parameter.
If you pass  a parameter in "JCL PARM format", the parameter list is the 
same as above, but the parameter is the halfword length followed by the 
data.

Granted, for the CALL you could have set up the parameter to be a halfword 
length followed by data. For that case, I agree that the two approaches 
end up being the same.

Peter Relson
z/OS Core Technology Design


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