[Coco] PC-to-CoCo floppy drive cable

[Bill Barnes]

If you refer to my post, you will be able to remove that question mark, as it isnt a question anymore :)  but it tells the drive logic what direction to move/step the heads in.

-Later!   -WB-    -- BABIC Computer Consulting.


--- On Wed, 11/12/08, Shain Klammer <sklammer at gmail.com> wrote:

> From: Shain Klammer <sklammer at gmail.com>
> Subject: Re: [Coco] PC-to-CoCo floppy drive cable
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Date: Wednesday, November 12, 2008, 4:23 PM
> >Roger,
> >
> >The cable attached to my 3.5 drive (which is hardwired
> as Drive 1) has
> >wires 10 - 12 twisted. This swaps only the Drive Select
> 0 and Drive
> >Select 1 lines so that it will respond as Drive 0.
> >
> >Darren
> 
> That matches the 26-3029 (Coco Floppy Controller) schematic
> (from 1983) link
> I posted :)
> Although, it numbers the drive selects as 1 to 4 instead of
> 0 to 3.  I've
> transcribed the pinouts below...
> 
> Pin    Function
> ===   =========
> 2       NC
> 4       NC
> 6       NC
> 8       Index Pulse
> 10     Drive Select 1
> 12     Drive Select 2
> 14     Drive Select 3
> 16     Motor On
> 18     Dir C (?)
> 20     Step
> 22     Write Data
> 24     Write Gate
> 26     Track 00
> 28     Write Protect
> 30     Read Data
> 32     Drive Select 4
> 34     NC
> 
> All other pins are tied to ground.
> 
> sk
> 
> 2008/11/12 Darren A <mechacoco at gmail.com>
> 
> > On 11/12/08, Roger Taylor wrote:
> >
> > > Anyway, I'm trying (yet again) to wire a PC
> 3.5" drive (hard-wired as
> > > Drive 1) to be seen as Drive 0 on the CoCo.  The
> drive currently is
> > > seen as Drive 1 and works good.  I'm using a
> cable I apparently
> > > hacked in the past but later I lined the ribbon
> wires back up
> > > normally and crimped it back to work with normal
> CoCo floppy
> > > drives.  I know I need to swap or twist a few of
> the ribbon wires,
> > > but I have no clue which ones they are now.
> >
> > --
> >
> > Roger,
> >
> > The cable attached to my 3.5 drive (which is hardwired
> as Drive 1) has
> > wires 10 - 12 twisted. This swaps only the Drive
> Select 0 and Drive
> > Select 1 lines so that it will respond as Drive 0.
> >
> > Darren
> >
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> >
> 
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