-----------------------------<snip>-----------------------

The model was required with operating systems MFT amd MVT. The model 
requirement went away when IDCAMS became available.

I don't think so!
I've only worked with MVS & up, and I learned the hard way about models being 
required.
----------------------------<unsnip>-----------------------------
As far back as I can remember, there were always two ways to provide a model.

1. Create a zero-space dataset, with the appropriate characteristics, of the same name as the Generation Index, on the same volume as the catalog containing the Generation index.

2. use the DCB=dsname construct, with appropriate characteristics, on the allocating DD statement. Many shops use this approach, pointing to a single model DSCB that was the same name for everyone.

So, some sort of model is required, but not necessarily a model named the same as the generation index.

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