I got it thanks 


> On Feb 4, 2021, at 9:34 AM, Peter Relson <[email protected]> wrote:
> 
> RBINTCOD is a 2-byte field. The fact that SVC's are 0-255 is unimportant 
> to that fact.
> You should compare the 2-byte field.
> 
> I don't know why, in general, you would require that the SVC-issuing RB be 
> a PRB (checking RBFTP for b'000'). 
> 
> If this is a type 2-3-4 SVC, then information about the issuer is in the 
> previous RB (whether that is a PRB or not).
> If this is a type 1 or type 6 SVC, then it is not.
> 
> And if you are handling extended SVC's you also need to examine the 
> issuer's register 15 value which, for a type 2-3-4 SVC, is in your RB.
> 
> Peter Relson
> z/OS Core Technology Design
> 
> 
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