Hi 

I am using a share PDF as a guide "Dul Address Space & Linkage Stack" as
guide to looking thru a WU Linkage Stack

In the case of a TCB I believe the current is pointed to by STCBLSDP

This is I understand it points to the header of which there four different
types each of X'128' bytes in Length

Header looking the zone portion of the first byte 1001 or 9
Trailer 1010  or A
Branch Entry C
PC entry D

In the case of header in order to calculate the address of the next stack it
would be header - 4 

When I get a X'89' the 8 being the stack suppression bit   - 4, -16 , or
even -32 from the header is all zeros


Thank you     

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