[Coco] Disk drive question

[Bob Devries]

Yes,
the OS9 boot process first checks sector 00 to see where on the disk the 
file OS9Boot resides.

I suggest you go on a cleaning spree :)

Regards, Bob Devries
27º10'26"S, 151º16'30"E

----- Original Message ----- 
From: "Bill Pierce" <ooogalapasooo at aol.com>
To: <coco at maltedmedia.com>
Sent: Thursday, January 19, 2012 7:48 AM
Subject: Re: [Coco] Disk drive question


> The J&M controller & the 3 drives are the same ones Michael Knudson (it's 
> his old system) used for years while developing Ultimuse3. I also have an 
> FD-502 that I've tried. The system hadn't been used except an ocassional 
> boot up in over 10 years. Nothing in the system was changed and it booted 
> (minus the hard boot due to missing boot floppy) when I first recieved it. 
> As I was trying to figure out the system and what I had recieved, when 
> things slowly started to fail. Keyboard was first (dry rotted pads on the 
> Eagle keys) then the drives started to slowly fail. In DECB the computer 
> itself runs fine. I have even loaded in ML programs, Lyra for instance, 
> and they run as expected. DSKINI and BACKUP seem to work but when I go to 
> read the new disk, they error out. OS9 format shows errors while 
> formating. Sector 00 being a constant in the errors. Assuming sector 00 is 
> not writing, I would also assume sector 00 is not reading therefore boot 
> fails in OS9 Lv II. Does os9 lv I use sector 00 in it's boot as well?
>
>
> Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Bill Pierce
> ooogalapasooo at aol.com
>
>
>
>
> -----Original Message-----
> From: Bob Devries <devries.bob at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Wed, Jan 18, 2012 4:31 pm
> Subject: Re: [Coco] Disk drive question
>
>
> I had two 80-track drives and one 40 track drive connected to my coco for
> ears. That should not prevent OS9 from booting.
> I would investigate the drive heads to see if they need cleaning, and also
> heck to see if the J&M controller is compatible with OS9 LII. I seem to
> emember reading somewhere that (one version of) the J&M controller was not
> ery compatible with the Coco3.
> Regards, Bob Devries
> 7º10'26"S, 151º16'30"E
> ----- Original Message ----- 
> rom: "Wayne Campbell" <asa.rand at gmail.com>
> o: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> ent: Thursday, January 19, 2012 4:13 AM
> ubject: Re: [Coco] Disk drive question
>
>> On another note, are there any special jumper settings needed to use a
>> Coco 5.25 drive on a PC? The 3 drives I have are a 5.25 40trk DS (D0),
>> 5.25 80trk DS (D2) and 3.5 80trk DS (D1). I do have a couple of old 3.5"
>> 1.4meg drives that came with PCs. The drive is set for drive 0 on the
>> Coco.
>
> This may be your problem. As I recall, a 80-track disk only allows you to
> use 3 drive descriptors. When I had my CoCo3 I had 2 40-trk 5.25s and 1
> 80-trk 3.5. I'm not certain, but trying to use 2 80-trk drives may be what
> is causing your problem. Someone who knows more than I can say for sure.
>
> Wayne
>
>
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