Thanks. You all have been very helpful. I think the approach is to look at one 
or more of the suggested CBT programs and see what they do. I suspect I can 
take it from there.

> I have assembly source code for 3card loader.  Would that help?  

I don't think so but let me keep that in mind. Thank you.

Charles

On Tue, 13 Feb 2024 12:19:46 -0600, Charles Mills <[email protected]> wrote:

>I am interested in writing a program to read the IPL records from a DASD 
>volume. (Read only, not update). I am comfortable with XDAP but how do I OPEN 
>a "dataset" that would include cylinder 0?
>
>APF, OPERATIONS and so forth are not out of the question.

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