The controller/computer probably can't handle the higher data rate of the HD
format (twice the DD rate).
----- Original Message -----
From: Stephen Adolph
To: m...@bitchin100.com
Sent: Sunday, March 24, 2019 9:32 PM
Subject: Re: [M100] question regarding floppy disks.
interestingly,
Yes, if I take an HD disk, and tape over the hole to make it appear to be a
DD disk, then it works.
But why?
the floppy is capable of both formats...
On Sun, Mar 24, 2019 at 7:39 PM Mike Stein <mhs.st...@gmail.com> wrote:
Have you tried closing the HD sense hole with a piece of tape or similar?
----- Original Message -----
From: Stephen Adolph
To: m...@bitchin100.com
Sent: Sunday, March 24, 2019 6:08 PM
Subject: Re: [M100] question regarding floppy disks.
the Coco is using it's standard controller
When issuing the DSKINI 0 command the coco tries to format for 180kB.
The combination of
(Coco, std controller, PC 1.44MB drive + a 720kB dd floppy) works
whereas
(Coco, std controller, PC 1.44MB drive + a 1.44MBB hd floppy) does not
work
this is something I don't understand!
On Sun, Mar 24, 2019 at 5:42 PM Gregory McGill <arcadeshop...@gmail.com>
wrote:
likely the floppy controller doesn't support 80 tracks or high
density.. most of the controllers of the era are ds/sd 40 track or dsdd 40
track.. are you able to format 720k? ds/dd 80 track?
Greg
On Sun, Mar 24, 2019 at 2:38 PM Stephen Adolph <twospru...@gmail.com>
wrote:
I'll start by saying this isn't an M100 or TPDD discussion, but just
looking to understand something.
I have a Tandy Coco3 with a 3.5 inch floppy drive. The drive is a
standard PC drive and it is working well.
Seems though that I cannot use 1.44 MB floppies in that drive. They
don't seem to want to format.
I really don't understand where the problem could be.
- the drive and the floppy are compatible
- the disk is known good and formats at 1.44MB in a PC
- if it can support 135 TPI, why can't it support 35 TPI?
Does anyone know what's going on?
thx
Steve
