MS-DOS 2.11 Assign.com
cisin at xenosoft.com
Thu Jul 30 15:44:54 CDT 2020
>> BTW, A "1.2MB" drive is fully capable of reading/writing the Otrona disks
>> WITH SUITABLE SOFTWARE on MOST machines.
On Thu, 30 Jul 2020, Robert Feldman via cctalk wrote:
> I have legal copies of several format translation programs, including
> Media Master and Convert, but they are 16-bit MS-DOS programs and will
> not run on my Windows 10 Pro computer. I have Windows XP and MS-DOS 6.22
> running in VMs under VirtualBox, but I cannot get the VMs to recognize
> my 1.2 MB drive (a Mitsumi D509V3) as a 1.2 MB drive -- the VMs seem to
> think it is a 3.5" 1.44MB drive, so the drive is not readable in the VM
> and the translation programs run but don't work. Also, the BIOS does not
> have support for any 5.25" floppy capacity other than 1.2MB. If I try to
> read 360KB floppies, I get a failure message with the comment that the
> floppies are most likely unformatted.
That is tragic.
Hence the need for the word "MOST".
In addition to suitable software, the hardware needs to support a 300K
bits per second data transfer rate with a "1.2M" 360RPM drive, OR a 250K
data transfer rate with a 300RPM drive.
I'm sad that they would build a machine that can't even read traditional
distribution floppies (360K, but also 160K/180K/320K).
If we were sufficiently insane, it would seem to be possible to use its
500K data transfer rate with a drive modified to run at 600 RPM.
(similarly to some early Sony 3.5" drives)
> It looks like I will have to break down and get a real 386 or 486 PC so
> I can use a real 360KB floppy drive and run MS-DOS directly.
If the machine will at least handle "720K" 3.5" (which is a 250K data
transfer rate), then it could still be used, IFF the "1.2M" is
But, one unit of classic hardware, or slightly less brain-dead "modern",
or even a flux transition reader, would solve it. And, permit access to
many hundreds of other disk formats.
Grumpy Ol' Fred cisin at xenosoft.com
More information about the cctalk