[Coco] 3.5" Drive Variable in the NitrOS-9 Module Header

[Bill Pierce]

-----Original Message David Ladd stated -----


On Sun, Jan 27, 2013 at 10:29 AM, Bill Pierce <ooogalapasooo at aol.com> wrote:

>
> >The only thing you really needed to do for 80 track drives was to make
> sure
> >you had typ=21 and cyl=50
> >On the high density 5.25" drives you needed to change some jumpers is all
> I
> >can remember at this point.  As far as 1.44MB 3.5" floppy drives if you
> >used a real 720K floppy disk in it the detector switch automatically would
> >set the correct data rate of the floppy drive to double density.
>
> Also, to use a 3.5" 1.44m disk as 720k, you could cover the "HD" id hole
> on the disk and the drive would recognize the disk as 720k. The hole was
> opposite of the write protect slider. I used the old write protect stickers
> from 5.25" disks for this. If the disk had been "factory formatted" for
> IBM, most times you needed to use a bulk eraser to clear the disk because
> the drive eraser wasn't strong enough to erase those "factory formatted"
> disks.
>

>Bill, good thing you brought that up.  I forgot to say anything about using
>1.44MB disks as 720K disks.


I figured that out when I first started transferring file to my PC when I purchased Jeff's Coco 3 emulator.
My PC had a HD 3.5 1.44m and would not read the Coco 720k disks. I bought some HD disks and I could cover the hole and Copy the files to the 1.44m disks on my Coco drive then they would read in the PC drive.

Bill P

Music from the Tandy/Radio Shack Color Computer 2 & 3
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Bill Pierce
ooogalapasooo at aol.com