I think in the early days everyone just used JNI to call the C routines.
Besides JRIO, I also see JZOS: 

http://www-03.ibm.com/servers/eserver/zseries/software/java/products/jzos/jzossamp.html

This was third-party-developed stuff bought by IBM in 2006.

Kirk Wolf wrote:
> 
> John,
> 
> JRIO has not been enhanced in a very long time.   The old IBM record
> framework originated in VisualAge, and now there are tools to build
> them in RDz.   I'm curious to hear specifically what you find
> confusing with the JZOS RecordGenerator code.  It is significantly
> simpler and faster than the old record framework, which is why we
> wrote it.    Please compare the code and performance of the two and
> I'm sure you will agree, but any suggestions that you have for
> improvment would be appreciated.
> 
> Kirk Wolf
> Dovetailed Technologies
> (and IBM JZOS development)
> 
> On Tue, Nov 17, 2009 at 7:47 AM, McKown, John
> <john.mck...@healthmarkets.com> wrote:
> 
> >> Timothy Sipples
> >
> > Ah! it looks like JRIO has been enhanced since last I looked at it. 
> > Something called the "Record Framework" has been added.
> >
> > --
> > John McKown
-- 
Don Poitras - zSeries R & D  -  SAS Institute Inc. -  SAS Campus Drive 
mailto:sas...@sas.com   (919)531-5637  Fax:677-4444     Cary, NC 27513

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