[Coco] values other than 0 or 1 for byte 14 of decb dir entry

Arthur Flexser flexser at fiu.edu
Sun Mar 25 05:21:35 EDT 2012


My guess would be that the files in question were created by some
application that did not use the standard Disk Basic file I/O routines
and that was either sloppy about the last sector or used byte 14 for
its own purposes.
Is there any pattern to what the oddball files are?

Art

On Sun, Mar 25, 2012 at 2:29 AM, Aaron Wolfe <aawolfe at gmail.com> wrote:
> Hi,
>
> According to my docs, bytes 14 and 15 are the number of bytes used in
> the last sector of the file.
> Since we have sectors of only 256 bytes, I think that means you'd
> either see 0 in 14 and any value in 15, or 1 in 14 with 0 in 15.
>
> That rule holds true for a vast majority of the disk images I have
> here, however there are some disks with files that seem to be claiming
> to use more than 256 bytes in their last sector.  I'm not sure what
> this means.  Am I misinterpreting the docs?
>
> I've values of 2, 7 and 8 in byte 14, and a couple instances of a 1 in
> 14 and a non zero value in 15.
>
> -Aaron
>
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