[Coco] NitrOS9 and B&B XT-RTC

[Bob Devries]

Thanks Gene,
as always a succint explanation. I can now move forward.

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "Gene Heskett" <gheskett at wdtv.com>
To: <coco at maltedmedia.com>
Sent: Tuesday, June 18, 2013 12:01 PM
Subject: Re: [Coco] NitrOS9 and B&B XT-RTC


> On Monday 17 June 2013 21:43:01 Bob Devries did opine:
>
>> Hi Mark,
>>
>> That's a very good write-up of the HDB-DOS/SuperIDE boot creation.
>> Thanks.
>>
>> One question, though: Is it possible to access the HDB-DOS (DECB)
>> virtual disks from within NitrOS9? I guess what I'm saying is: Can I
>> read/write the "boot" disk in slot 255 from NitrOS9 with a view to
>> making small(ish) modifications?
>>
>> Regards, Bob Devries
>> Dalby, QLD, Australia
>>
> Sure Bob, piece of cake, its just another floppy ONCE you have it setup.
> To set it up, use the sh.dd descriptor.
>
> First, do a ded /dd@ to look at LSN0 of the hard drive.  You want to write
> down the DD.SIZ value, its in hex.  Quit dEd, you're done with it for now.
> Then locate the copy of sh.dd in the modules/rbf tree of the distribution.
> Get ready to run
>
> dmode -sh.dd stp=FF wpc=(the first 2 hex chars of DD.SIZ) ofs=(the last 4
> characters of DD.SIZ + 1)
>
> Make a boot disk using that descriptor, reboot to it, and do a dir /sh, 
> and
> you should be looking at disk 255 (the stp=$FF) of the HDBDOS 'partition'.
>
> To summerize, the wpc and ofs settings should be the DD.SIZ of the os9
> formatted section of your hard drive.
>
> Then, the stp=value is which of those HDBDOS disks it points at.  Setting
> stp=00 should show you the first disk, which starts on the next sector of
> the hard drive beyond the DD.SIZ in the hard drives LSN0, $01 and its
> drive1, $02 and its drive2 to rsbasic etc.
> HDBDOS virtual disks are fixed size, same as the original 35 track coco
> disks.  The driver adds 630 to the wpc & ofs values for every increment of
> the stp value.
>
> I hope this helps.
>
> Cheers, Gene
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