Re: ProDOS commands

[Stephen Shaw <stephen@apple2.org.invalid.za>]

On Fri, 14 Jun 2002 09:03:44 +1200, David Empson wrote:

> Simon Williams <ludditetech@mac.com> wrote:
>
>> Is there a prodos command that will list all volumes currently online?
>
> There is a call in the ProDOS kernel which does this, but no standard
> command in BASIC.SYSTEM to make use of it or to display the output in a
> readable format.  I expect that someone may have written a third-party
> add-on command to do this.
>
>> or at least identify the volume in a specific slot/drive...
>
> What is wrong with CAT,Sn,Dn?
>
> You can also use PREFIX,Sn,Dn followed by PREFIX by itself (which prints
> the current prefix).
>
> If you are doing this from inside a program, you need to use an INPUT
> statement after issuing the second PREFIX command.
>
>> ...and what about VERIFY ???
>> how is that supposed to work?
>
> I haven't used this one enough to remember the details.  Where's that
> manual...
>
> VERIFY's purpose is to confirm that a file exists.  It doesn't open the
> file and verify its contents.

VERIFY did more under DOS3.3 it did verify a files existence (an contents???)

>
>  If I VERIFY a valid pathname it does
>> nothing, even if I append an incorrect slot & drive number.
>
> If you specify a slot and drive in conjunction with a full pathname, the
> slot and drive parameters will be ineffective.  They cause ProDOS to
> look at the specified slot and drive first, but it will then search
> other drives to locate a volume of the specified name.
>
> If you use a partial pathname in conjunction with the slot and drive
> parameters, the filename is expected to be relative to the root
> directory of the indicated slot and drive.  If you have set a prefix, it
> might override this.  You can use PREFIX / to clear the prefix and
> return to pure slot-and-drive operation.
>
>> If I VERIFY an invalid pathname it kindly tells me PATH NOT FOUND. And if
>> I try to VERIFY slot & drive, with no pathname, I get COPYRIGHT APPLE
>> COMPUTER -- what does it all mean?
>
> That may be a bug.  Which version of BASIC.SYSTEM are you running?
>
> If you don't have a prefix set, then VERIFY,Sn,Dn should verify the root
> directory of the volume in the specified drive.  I've never used this
> particular variation, as there are better ways of doing this.

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