[Coco] Four floppy drives?

[George Ramsower]

  Art, he didn't say they were formatted as double sided.  I did the 
four drive setup many years ago. But all four were single sided, in the 
formatting.
  I felt like a KING!! with that setup.
George R.

On 7/31/2015 2:25 PM, Arthur Flexser wrote:
> It is puzzling how you managed to get 4 double-sided drives working.
> Ordinarily, only 3 would be available.  You have 4 drive select lines, but
> one would normally be used as a side select for double-sided drives.  I
> vaguely recall an article that described some scheme that recognized that
> when two drive select lines were simultaneously selected, a fourth drive
> would be accessed.  Did you do something like that?  Did you modify the
> Disk Basic ROM?
>
> Art
>
> On Fri, Jul 31, 2015 at 2:52 PM, David Gettle <david17361 at gmail.com> wrote:
>
>> When I was in college I was running 2 5.25 and 2 3.5" DSDD floppy drives
>> off a FD502 card from Radioshack with no problems, all I had to do was set
>> the drive jumpers and have a custom cable made. amazing that the CoCo would
>> allow me to format all of them at the same time in OS-9. I Ticked off some
>> UNIX users because their unix boxes couldn't do that :)
>>
>> On Tue, Jul 28, 2015 at 10:15 PM, Mark J. Blair <nf6x at nf6x.net> wrote:
>>
>>