[Info-vax] RMS and SSIO (again)

[Simon Clubley]

On 2022-01-13, Greg Tinkler <tinklerg at gmail.com> wrote:
> Effectively making it a Quadword, so why not have RAB$Q_RFA or RAB$Q_BOFFSET
> No change to the layout of the RAB.  We would need to flag this to RMS possibly by using ROP2 RAB$M_BOFFSET.
> At lease from an API point of view RMS could support VERY large files.  And yes there would need to be other engineering changes but these could be rolled out in a phased way.  FAB will need to be fixed once GFS2 is available, so maybe FAB64$ with fab$l_alq -> fab$q_alq.
>

So you want to release an API claiming support for very large files _before_
actually performing the engineering work required ?

Do the DLM messages have the required extra 2 bytes going spare for your
expanded RFA ?

How would you implement this in a backwards compatible way at DLM level ?

When would you implement Prolog-4 for indexed files to support the required
larger internal pointers ?

Maybe I'm just old fashioned but I don't release an API for something
until _after_ I've done the engineering work. :-)

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.