[Coco] CoCoSDC under NitrOS9

[Dave Philipsen]

Nice to know.  Sometimes I end up using the "brute force" method to get things done.

Dave

> On May 31, 2018, at 12:48 AM, David Ladd <davidwladd at gmail.com> wrote:
> 
> Dave,
> 
> I myself would have used the "os9" utility from the Toolshed Project.  You
> could have created the formatted disk image with it and written the
> boot/kernel track to the correct offset for use with the CoCoSDC.  Then
> after that you could have copied your OS9Boot file to the new disk image
> and then used the kwikgen tool to link the LSN0 to the OS9Boot file.  Then
> used dsave to copy the rest of the files over to the new disk image.
> 
> I have used the "os9" utility a few times to create some test boot disks
> for use with both the CoCoSDC and DriveWire. :D
> 
> 
> 
> +-----------------------------------------------------------------------+
> | David Ladd a.k.a. PacoOtaktay a.k.a. Drencor                          |
> | YouTube: http://www.youtube.com/user/PacoOtaktay                      |
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> | Do you have your CoCo 3 yet?                                          |
> +-----------------------------------------------------------------------+
> 
> 
>> On Thu, May 31, 2018 at 12:15 AM, Dave Philipsen <dave at davebiz.com> wrote:
>> 
>> Well, I started with Allen’s 128 MB image and I used a binary editor under
>> Windows and expanded it to 1 GB.  Then I put the dsk file on the SD card
>> and mounted it.  From OS9 I dmode’d the descriptor for /sd1 and changed the
>> # of cylinders from 007F to 07FF.  Then I formatted it (OS9 format verified
>> the size of 4+ million sectors before I started the format).  Then I did a
>> cobbler /sd1 which correctly copied the boot file to it but had an error
>> because it couldn’t correctly write the boot track.  Then I put the SD card
>> in a reader and started diddling around with a binary editor in Windows.
>> The boot track always resides at the logical position of track 34 (sector
>> $264??) so I found the boot track on the 128 MB image (starts with the
>> letters ‘OS’ or $4F53).  I copied the boot track out of the 128 MB image
>> and into the 1 GB image.  You have to remember that even though the boot
>> track gets put at the same offset (sector $264??) the disk allocation map
>> is different because the 1GB image uses 8 sectors/cluster instead of one.
>> So you have to manually calculate where to set the bits in the allocation
>> map so the operating system won’t overwrite the boot track.
>> 
>> Anyway, I’m just going mostly by memory but I guess I could do a write-up
>> describing exactly how I did it.
>> 
>> http://www.davebiz.com/images/1GB.jpg
>> 
>> 
>> Sent from my iPad
>> 
>>> On May 30, 2018, at 7:05 PM, Travis Poppe <travispoppe at gmail.com> wrote:
>>> 
>>> I'm curious how you managed the 1GB bootable VHD?
>>> 
>>>> On Tue, May 29, 2018 at 3:33 PM Dave Philipsen <dave at davebiz.com>
>> wrote:
>>>> 
>>>> Thanks to Allen Huffman I've been running a bootable NitrOS9 image on my
>>>> CoCoSDC for some time now.  Recently I increased the size of the image
>>>> and I now have a bootable 1GB partition for NitrOS9.  So now I would
>>>> like to be able to mount and unmount images from NitrOS9.  Does anyone
>>>> if any documentation exists for the CoCoSDC (short of disassembling the
>>>> SDC DOS) that would facilitate me in writing some utilities under
>>>> NitrOS9 for this?
>>>> 
>>>> Dave
>>>> 
>>>> 
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>>> 
>>> 
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