[Coco] Maximum CoCo Drives

[Arthur Flexser]

I think the problem with having 4 double-sided drives is that the side
select bit is the same bit as the Drive 3 (4th drive) select.  How do you
get around that?

Art

On Sat, Jan 25, 2020 at 2:09 PM David Gettle <david17361 at gmail.com> wrote:

> All you need to do is attach all 4 drives to the floppy card with a cable
> made with 5 card edge connectors, Then use dmode and modpatch or another
> hexidecimal editor to modify the drivers for the additional floppy drives
> and include them in the new file list for when you create your new boot
> disk. when done you should have drives with the drive ID's of 0, 1, 2, and
> 3. if you are using the same type drive for all of them the drive ID is all
> you need to change. use the save command to save the files from memory
> after you modify the descriptors in memory with dmode ie dmode /d0 drv=2
> then use modpatch to change the name of the descriptor inside memory (I
> forget the exact address of the byte that needs to be changed it's been 25
> years since I did this.)
>
> On Sat, Jan 25, 2020 at 1:17 PM Michael Kline via Coco <
> coco at maltedmedia.com>
> wrote:
>
> > Do you still have the instructions on how to do it? I would love to play
> > with that idea.
> > Michael
> >
> > Sent from Yahoo Mail on Android
> >
> >   On Sat, Jan 25, 2020 at 11:42, David Gettle<david17361 at gmail.com>
> > wrote:   Back in my college days I was running a CoCo3 with 4 DSDD
> drives,
> > 2 5.25's
> > and 2 3.5's and even did a demo in front of my networking class where I
> > connected a IBMPC to the CoCo3 as a terminal, just to prove that an 8 bit
> > computer could multi-task, Then blew the instructor's mind when I
> formatted
> > 4 floppy drives at the same time with OS-9, while running the bouncing
> ball
> > demo from a hard drive I had connected to the CoCo on the IBM terminal. I
> > also had the CoCo running with the Tandy RGB monitor, and a TV as dual
> > monitors..on the CoCo.
> >
> > On Thu, Jan 23, 2020 at 8:09 PM RETRO Innovations <go4retro at go4retro.com
> >
> > wrote:
> >
> > > On 1/23/2020 10:20 AM, Alex Evans wrote:
> > > > There were people who did hacks to address as many as 15 sides using
> > > > the standard controller. There are also ways to modify some disk
> > > > controllers for the CoCo to allow for more than one controller. All
> of
> > > > this requires some custom software for dealing with the drives, but
> if
> > > > you use OS-9 this isn't really that big an issue.
> > >
> > > Well, if someone wants to play with the idea:
> > >
> > > https://github.com/go4retro/DrivePlexer
> > >
> > >
> > >
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