[Info-vax] VMS porting/rewrite, was: Re: [OT] Wirth style languages, was: Re: Obscure Ada compiler vendors?

[Johnny Billquist]

On 2013-04-10 20:40, Simon Clubley wrote:
> On 2013-04-10, VAXman-  @SendSpamHere.ORG <VAXman- at SendSpamHere.ORG> wrote:
>> In article <kk45h2$m4v$2 at dont-email.me>, Simon Clubley <clubley at remove_me.eisner.decus.org-Earth.UFP> writes:
>>> On 2013-04-10, Simon Clubley <clubley at remove_me.eisner.decus.org-Earth.UFP> wrote:
>>>>
>>>> The only thing I've ever seen a ACP used for on VMS is for tape drives
>>>> and I've never even come across any public documentation which would
>>>> allow me to write one of those.
>>>>
>>>
>>> Before I get 5 zillion messages pointing out the various ACPs in use in
>>> VMS, I should clarify that to mean I meant "filesystem on a device" support
>>> ACPs.
>>
>> Remember the F11BACP subsequently replaced by the XQP (which is still, in
>> essence, an ACP)???
>>
>
> I started out with VMS in the 5.x era; before that I was in the PDP-11
> world.

If that was in RSX-land, then you should definitely have seen ACPs. All 
basic file operations goes through the ACP, and the ACP could actually 
use any kind of file system underneath, with the caveats I mentioned before.
(It is unfortunate that some details are transparent enough that higher 
layers can go around parts of the ACP if they feel like it, and they do...)

	Johnny