[Coco] Technical OS9 Q.

[Robert Gault]

LSN0 should contain at DD.OPT ($3F) path descriptor options. That would 
put a copy of PD.SAS at LSN0 $4D.

Looking at some .dsk .os9 images on my PC indicates that this 
information is available.

Bob Devries wrote:
> I'm wanting to add a directory entry into a OS-9 .dsk or .vhd file on 
> the PC. Remember this is to run on the PC, and is programmed in PC C, 
> not under OS-9.
> 
> I've worked out that I need to first step through the directory, looking 
> for a deleted file slot (starts with '\0').
> If that fails, I need to add the new file to the end of the directory, 
> OK, so that is no problem unless.....
> 
> What if the directory allocation is fully utilised? That is, all the 
> sectors originally allocated are used? I would need to allocate another 
> block of sectors, but how will I know how many to allocate? Under OS-9, 
> the create file routine would use IT.SAS from the device descriptor, but 
> this value is not available to me.
> 
> How should I proceed? Any clues? Suggestions?
> -- 
> Regards, Bob Devries, Dalby, Queensland, Australia
> 
> Isaiah 50:4 The sovereign Lord has given me
> the capacity to be his spokesman,
> so that I know how to help the weary.
> 
> website: http://www.home.gil.com.au/~bdevasl
> my blog: http://bdevries.invigorated.org/
> 
>