[Coco] PC-to-CoCo floppy drive cable

[Shain Klammer]

>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
>
> --
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>