On 11 May 2016 at 10:07, Martin Packer <[email protected]> wrote: > The nasty answer to "what happened to VIO?" is "nothing". :-) :-( > > Seriously, it remains as before but implemented in central storage rather > than expanded.
VIO long predates the existence of expanded storage. It was original with MVS (2.0 in iirc 1972), and at the time there was nowhere for it to go but the paging system. Expanded storage is one of those things that, for a combination of technical and marketing reasons, had its day in the sun and has gone, while VIO continues. The biggest reason to use VIO rather than the various alternatives mentioned is that it is compatible. An existing application need know nothing about it, and can be offered improved performance with no code changes. In these days of large memory it may seem quaint, but it has its place. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
