[Coco] Four floppy drives?

[Barry Nelson]

I do not understand how the 4th drive could ever be accessed as double sided since the drive select line for the 4th drive is the same line that is used for side select unless you used some custom circuitry and device drivers like I did to get 8 drives working. There would be two problems. First, how would you select side two on the fourth drive? Secondly, any time you selected side 2 on any other drive, you would turn on and select drive 4 as well. Please explain. I'm not saying it can't be done, I got 8 drives working, but I did it by building a cable with a custom drive select circuit, and rewriting the OS-9 floppy driver.

On Aug 1, 2015, at 10:44 PM, coco-request at maltedmedia.com wrote:

> Date: Sat, 1 Aug 2015 08:49:32 -0700
> From: David Gettle <david17361 at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Subject: Re: [Coco] Four floppy drives?
> Message-ID:
> 	<CABvSbETH1Y69cV4uy=_QmGsiZAnMGoGzC3o6G2At9fbCmFqR_A at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
> 
> In DECB all 4 drives were formatted as SSDD, under OS-9 they were formatted
> as DSDD