[Coco] can't backup nitros9 disks with stock OS9

[Bob Devries]

Why is it that when I've created an 80-track disk from the .DSK files from 
the NitrOS9 site, I cannot use backup to make a copy of that using my stock 
OS9 system?

The byte at offset $10 of the LSN0 is still set at $03, which indicates a 48 
tpi disk, not a 96 tpi disk.
Can't we adopt the OS9/68000 standard which is documented in the V2.4 
manuals? Viz:

>From the OS9/68000 technical manualVersion 2.4:

Device descriptor opts:

PD_TYP Disk Type
Defines the physical type of the disk, and indicates the revision level of 
the descriptor.
If bit 7 = 0, floppy disk parameters are described in bits 0-6:
              bit 0:   0 = 5 1/4" floppy disk (pre-Version 2.4 of OS-9)
                        1 = 8" floppy disk (pre-Version 2.4 of OS-9)
         bits 1-3:  0 = (pre-Version 2.4 descriptor) Bit 0 describes 
type/rates.
                       1 = 8" physical size
                       2 = 5 1/4" physical size
                       3 = 3 1/2" physical size
          4-7:   Reserved
            bit 4:   Reserved
            bit 5:   0 = Track 0, side 0, single density
                      1 = Track 0, side 0, double density
           bit 6: Reserved
 If bit 7 =  1, hard disk parameters are described in bits 0-6:
           bits 0-5:  Reserved
            bit 6:   0 = Fixed hard disk
                      1 = Removable hard disk

PD_DNS Disk Density *
Indicates the hardware density capabilities of a floppy disk drive:
           bit 0:   0 = Single bit density (FM)
                     1 = Double bit density (MFM)
           bit 1:   1 = Double track density 96 TPI/135 TPI)
           bit 2:   1 = Quad track density (192 TPI)
           bit 3:   1 = Octal track density (384 TPI)


On LSN0:

DD_FMT Disk Format: Density/Sides
Defines the format of the media volume, to enable drivers to adapt to 
different formats:
          bit 0:   0 = Single-sided
                    1 = Double-sided
          bit 1:   0 = Single-density (FM)
                    1 = Double-density (MFM)
          bit 2:   1 = Double-track density (96 TPI/135 TPI)
          bit 3:   1 = Quad track density (192 TPI)
          bit 4:   1 = Octal track density (384 TPI)
--
Regards, Bob Devries. Dalby, Queensland, Australia.
Faith isn't faith until it's all you're holding on to.
http://e4god.com/freeblogs/bdevries/