Re: CBM-900 floppy disk format/encoding

From: Uffe Jakobsen <uffe_at_uffe.org>
Date: Sun, 23 Oct 2011 01:44:46 +0200
Message-ID: <4EA3556E.3070705@uffe.org>
On 2011-10-22 13:09, Hoffmann-Vetter, Martin wrote:
> Hello,
>
>> The 4040 format is 48 Tracks Per Inch, while the 8050 format is 100
>> TPI.
>
> Back to the problem with the C900 disks. The drive must be a 80 track model.
> But there are two track densities for this: 96 TPI and 100 TPI. The 8x50 and
> SFD1001 use a 100 TPI drive. But witch version is installed into a C900? And
> witch version has your drive at the Kryoflux unit?
>

I think that we are onto something here.

 From what I've read all sources state pretty consistent that the 
CBM-900 drives are SFD-1001 "like".

That I've (now) chosen to interpret as the drive beeing a 100 TPI drive 
- nothing more.

The drive attached to my kruoflux is a plain simple "standard" 5.25" 
capable of 80 (83) tracks - I guess that means that the drive uses 96 
TPI density ?

And I guess that a 96 TPI drive will not be able to read anything out of 
a 100 TPI drive ?

That would explain why a kryoflux dump came up with nothing...

/Uffe








       Message was sent through the cbm-hackers mailing list
Received on 2011-10-23 00:00:21

Archive generated by hypermail 2.2.0.