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

[Stephen H. Fischer]

Hi,

Being the thread starter I am being strongly reluctantly compelled to direct 
those interested in this subject to Willi's post to the CoCo Forums.

http://www.tandycoco.com/forum/viewtopic.php?p=759#p759

More found on "comp.sys.apple2".

http://www.hackzapple.com/ORG1/M2/COPROC/6809MILL.HTM

https://groups.google.com/forum/?fromgroups#!topic/comp.sys.apple2/6VqeCtLVGYE

https://groups.google.com/forum/?fromgroups#!topic/comp.sys.apple2/ZYAeM7I-LoM

Be sure and read down to Aug 5, 2012!!!



SHF


----- Original Message ----- 
From: "Willi Kusche" <CoCo at wilserv.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Sunday, September 02, 2012 2:56 PM
Subject: [Coco] OS-9 sector allocation bitmap AKA LSN 1


> Hi!
>
>    While working on programs to convert OS-9 disk images from Apple
> II format to CoCo format and back I noticed that bit zero of the last
> bitmap byte is apparently set in all disk images I examined.  I looked
> at about a dozen CoCo disk images and two Apple II images and bit zero
> of the last bitmap byte was set in all of them.  Can anyone enlighten
> me as to why this is so?
>
> Willi
>