[Coco] OS-9 sector allocation bitmap AKA LSN 1

[Gene Heskett]

On Sunday 02 September 2012 19:00:02 Willi Kusche did opine:

> Hi!
> 
> On Sun, Sep 2, 2012 at 6:17 PM, Gene wrote:
> > The numbering system, at least in os9, is base 0. AFAIK, free reports
> > the correct data, and it gets it from the map sectors.
> 
>     What I'm wondering is why, even in a disk that is only half full,
> resulting in a string of null bytes in the bitmap, is the rightmost
> bit of the last bitmap byte always set?  Normally, that last bit
> shouldn't be set until the disk becomes completely full.  Since
> posting my original query, I took a quick look at the source for the
> "FORMAT" command but that's a huge chunk of source for a 6809 newbie
> like me to make sense of.
> 
> Willi
> 
You may in fact have found a bug, but I wonder if its worth fixing.  My 
system isn't up at the moment, but I assume one could clear that bit with 
dEd of bd, and then check to see if it triggers anything, or is even 
reported by free.  I really don't know, never having noticed that.

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Cheers, Gene
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