Groups > comp.sys.apple2.programmer > #3257

Different prerequisites for ProDOS 8 MLI API

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From	Benoit0123 <bgilon@free.fr>
Newsgroups	comp.sys.apple2.programmer
Subject	Different prerequisites for ProDOS 8 MLI API
Date	Mon, 6 Feb 2017 13:43:12 -0000 (UTC)
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Hi all,
I am in the process of developing a ProDOS 8 utility, and am getting getting
some weird results in some cases.
I got a look at two reference manuals available online, that is:
The ProDOS 8 TRM, and
Beneath Apple ProDOS by Don Worth and Peter Lechner.

The requirement being on the io_buffer address that should be passed to the
OPEN MLI call.
The PRM states that the io_buffer address should point to a non allocated
1024 bytes buffer beginning at a page address ("$XY00" address)
The Beneath Apple ProDOS states that the io_buffer address should point to a
page with the same properties as stated above but in addition that the page
number be *even* (I understand: divisible by 2). One block for the index
data storage, and the other block for the data storage itself.

For the time being the buffer setup start @ address $B900 and ends @ address
$BCFF and I am getting some weird result but not always.
My asking is: do you know from your experience if the requirement that the
page # for specifying the buffer begin be even is a valid requirement or
not.

The buffers setup by BI (BASIC.SYSTEM) start @ adress $9600, $9200, ... so
are always compliant with the stricter constraints quoted above.

Thank your for any information on this,

Anyway tonight I will reorganize my code and give it a try once I am back @
home.

Regards,
Benoît


-- 
Growing old is mandatory..
growing up is optional..
But the other way round is as true.

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Different prerequisites for ProDOS 8 MLI API Benoit0123 <bgilon@free.fr> - 2017-02-06 13:43 +0000
  Re: Different prerequisites for ProDOS 8 MLI API John Brooks <jbrooks@blueshiftinc.com> - 2017-02-06 08:09 -0800
    Re: Different prerequisites for ProDOS 8 MLI API Benoit0123 <bgilon@free.fr> - 2017-02-12 10:35 +0000
    Re: Different prerequisites for ProDOS 8 MLI API Benoit0123 <bgilon@free.fr> - 2017-02-12 10:52 +0000
    Re: Different prerequisites for ProDOS 8 MLI API Benoit0123 <bgilon@free.fr> - 2017-02-12 14:02 +0000
      Re: Different prerequisites for ProDOS 8 MLI API John Brooks <jbrooks@blueshiftinc.com> - 2017-02-12 13:28 -0800

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