Tom Marchant and others pointed out
I don't have an answer to your questions, but I think you mean
    LA   15,16


And I agree, However From 
z/OS UNIX System Services Programming: Assembler Callable Services Reference
SA23-2281-00 


The following is an example of code that specifies the offset. The example 
assumes that register 1 is set up with the address of the parameter list. 
Replace offset with the appropriate value from the following offset table. 
L     15,16           CVT - common vector table
L     15,544(15)      CSRTABLE
L     15,24(15)       CSR slot
L     15,offset(15)   Address of the service
BALR  14,15           Branch and link 

 
I suspect the documentation is wrong


---------- Original Message ----------
From: Tom Marchant <[email protected]>
To: [email protected]
Subject: Re: USS Callable Assembler Services
Date: Mon, 18 Nov 2013 12:47:43 -0600

On Mon, 18 Nov 2013 17:20:34 GMT, [email protected] wrote:

>L     15,16           CVT - communication vector table   

I don't have an answer to your questions, but I think you mean
    LA   15,16

-- 
Tom Marchant

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