Re: Once again musing about "DOS 3.3 for ProDOS"

[Oliver Schmidt <ol.sc@web.de>]

Hi Steve,

> This time I'm armed with a basic understanding of the ProDOS API, but
> still don't understand the inner workings of DOS.

You write "this time" and "once again" but even after some search I
don't find the discussion you seem to refer to...

> The source of PDOS RDOS tells me what I need to know about interfacing on
> a basic (lol) level to ProDOS but I haven't seen something similar for DOS
> 3.3.  I am thinking I will want to merely patch out the file manager and
> RWTS, and replace INIT with BYE.  Doing the former is the most difficult.

I seem to be unclear of what you want to want to archive. For many
BASIC programs the existing BASIC.SYSTEM is already a sufficient "DOS
3.3 emulation". And when it comes to RWTS access then the general
question would be how to map those accesses to ProDOS. Not talking
about implementation issues but about conceptual questions. If some
program reads some sector on some track it most likely presumes a DOS
3.3 layout with a DOS 3.3 catalog / vtoc / etc. The only way I see
such a program working in a successful / meaningful way on a higher
capacity drive is to work with DOS 3.3 partitions or DOS 3.3 disk
images.

The further is already implemented: DOS.MASTER

The latter was discussed here:
http://groups.google.com/group/comp.sys.apple2/browse_thread/thread/d2d895f5b8f38614/d3ecd7714a8d5f94

I don't see that something simpler than these two approaches would
give a significant benefit over what BASIC.SYSTEM already does:

Regards,
Oliver