Pieter,

This code works fine. The code below was used to get the current TCB address 
before PSATOLD was introduced with the advent of SRBs.

I doubt if changing the code will make any difference one way or the other as 
it will all be in cache anyway.

Tom

Sent from my iPhone

> On Sep 2, 2020, at 9:59 AM, [email protected] <[email protected]> wrote:
> 
> HI all 
> I found the following code on 2 different client systems (one of them in an 
> IMS sample user exit). 
> 
> L R8,CVTPTR 
> L R8,CVTTCBP-CVT(,R8) 
> L R8,4(,R8) 
> 
> Can anybody think of a reason why I should not rather use L R8,PSATOLD-PSA ? 
> 
> Pieter 


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