It’s 2012 

Thanks 

> On Jan 10, 2024, at 2:45 PM, Tom Marchant 
> <0000000a2a8c2020-dmarc-requ...@listserv.ua.edu> wrote:
> 
> I'm pretty sure that nothing about the way MVS works with the Linkage Stack 
> is a programming interface.
> 
> How old is that presentation you are using? The Linkage Stack changed 
> significantly  with z/Architecture.
> The definitive documentation is the Principles of Operation.
> 
> If you want to learn about the structure of the Linkage stack, issue several 
> BAKR instructions and abend.
> Use IPCS to process the resulting SYSMDUMP.
> Look at the formatted linkage stack entries in the dump and compare that to 
> storage.
> 
> --
> Tom Marchant
> 
>> On Wed, 10 Jan 2024 10:18:42 -0500, Joseph Reichman <reichman...@gmail.com> 
>> wrote:
>> 
>> 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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