[Coco] Nitros9 on a CC3 512k

[Gene Heskett]

On Sunday 28 February 2010, Gene Heskett wrote:
>On Sunday 28 February 2010, George Ramsower wrote:
>> Finally I get around to play with Nitros9, build a boot disk on my XP box
>>using Cocodisk from nos96809l2v030208coco3_80d.dsk and it has a problem.
>> First, I used cocodisk to format the 720K 3.5" disk with 80 track, two
>>sided. Then did the "Write to disk" to do this.
>> The coco does boot and gets as far as the startup file and hangs.
>> Rebooting with a working OS9 disk and looking at the Nitros9 disk reveals
>>that the root directory appears to be intact but I cannot list the startup
>>file or peer into the cmds directory. Error 247.
>> I tried formatting a floppy on the coco and trying again but, with the
>> same result.
>>
>> I would offer more info but don't what to tell you. Ask me questions and
>> I will begin the discovery process as to why I'm getting this problem.
>>
>> Thanks,
>>
>>George
>
>I have found that the default build does not properly identify the disk
>images format, and have had to edit it with a hex editor, changing the
> bytes at offset $10, and again at $41 I believe, to (if using the 80 track
> image, $07 at 10, and $03@$42).
>
That should be at offset $41 I believe.  My mistake.

>The formatted disk should be looked at in ded /d0@, the values at those
>locations noted, and the file edited with a hex editor to match and then
>rewritten to the real disk.  This area of the formatted disk is overwritten
>by the writing of the image, so the image has to match the original format
> in those two places otherwise the driver thinks you have a 40 track drive
> with an 80 track disk in it or some such tomfoolery.
>


-- 
Cheers, Gene
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