[Coco] dw 3

[Aaron Wolfe]

On Mon, Nov 22, 2010 at 9:28 PM, Frank Pittel <fwp at deepthought.com> wrote:
> I like the idea of being able to select drive 256-512, etc up 1024 if desired.
> :-) Leaving the ability to use drive #? would be important for backwards
> compatibility. That would take a rewrite of drivewire hdbdos though.
>

I don't think there is any way to have more than 256 disk
images/drives online at the same time.  Doing things the way DW3 does
them, you can switch between 4 banks of 256 disks easily, but they
will always be used as disk 0-255.  This is also possible in DW4 in
the default mode.  However, to use this means managing large files
that contain multiple disk images, sort of a hassle.

In the alternate mode of dw4, you can define an infinite number of
disks sets where each of the 256 slots in the set points to a local
.dsk file or a URL where a .dsk file lives.  Still, only one disk set
can be loaded at a time, and they are still referenced as disks 0-255.

-Aaron


> The Other Frank
>
> On Mon, Nov 22, 2010 at 08:55:48PM -0500, Aaron Wolfe wrote:
>> On Mon, Nov 22, 2010 at 8:09 PM, Robert Gault <robert.gault at att.net> wrote:
>> > Aaron Wolfe wrote:
>> >
>> >> Hrmm we may have some wires crossed.  What the switch does is to
>> >> ignore the drive sent in the DW op call altogether, and instead map to
>> >> a disk image based on the sector being read or written to.  Sectors
>> >> 0-629 point to "disk 0", 630-1259 are "disk 1", and so on all the way
>> >> up to disk 255.  DRIVE #0-3 makes no difference, DRIVE 0-255 does.
>> >>
>> >
>> > How is that different from the normal HDBDOS with Drivewire? That combo
>> > already selects drives 0-255 for whatever DW slot has been selected.
>> > The only difference I can see is that HDBDOS calculates the LSN based on
>> > 630xdrive# so that nothing needs to be calculated by Drivewire.
>> >
>>
>> The difference is just that for example "DIR 1" would show the
>> directory of the file mounted in drive 1 on the DW side, not the
>> directory of the image found starting at sector 630 of the file
>> mounted in drive 0 on the DW side... hope that makes sense?
>>
>> If there is no point in doing this, I will gladly remove it.  I am not
>> the best person to make that decision, I don't use these features at
>> all myself :(
>>
>> -Aaron
>>
>>
>>
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