On Tue, 13 Feb 2018 20:00:47 -0600, Jim Ruddy wrote:

>Wouldn't a 64K byte parameter list run into problems with programs such as 
>HLASM, compilers, and other programs which allow an optional DD name list to 
>be passed as a second parameter when invoked from a program? As I recall, they 
>detect whether the DD name list is passed by testing the high bit - the "sign" 
>bit - of the first parameter.
No, they test the high bit of the *address* of the first parameter.

(VL is not supported in 64-bit mode.)

--  gil

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