On Mon, 9 Dec 2013 12:40:17 -0500, Gerhard Postpischil <[email protected]> 
wrote:

>On 12/9/2013 10:19 AM, Steve Comstock wrote:
>> Actually, no. I've used BSAM a fair amount. Just never
>> TRUNC, that I can recall.
> 
I meant that with BSAM (or BPAM) the programmer has explicit control
over the size of each block.

>BSAM has a built-in gotcha. An explicit block size in the WRITE macro
>may get you a full-size block anyway. The only way around that was to
>put the desired size into DCBBLKSI also. I stumbled on that with both FB
>and FBS. I suspect the size is honored directly only for D, U, and V.
> 
And remember to change it back before CLOSE, else it gets copied back
into the label, with undesirable consequences.

-- gil

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