[Coco] PC-to-CoCo floppy drive cable
lamune at doki-doki.net
Wed Nov 12 19:01:53 EST 2008
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of theother_bob
> Sent: Wednesday, November 12, 2008 2:47 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] PC-to-CoCo floppy drive cable
> the CoCo and PC pinouts are not different, only the OS implementation
> of the Side Select line is different (aside from the few lines that are
> not even used by the CoCo controller.) Since the CoCo didn't "support"
> DS drives, the SS line was used as DriveSelect3 (using 0-3 numbering).
> Four single sided drives for Basic/RSDOS/HDB-DOS can equal two Double
> Sided drives, or *any* four sides of three DS drives.
> For anyone interested, I have an article on my website with all the
> gory details of mapping physical drive sides to RSDOS drive numbers.
> It's in the Technical Info section under Using Double Sided Drives.
> This information was a cornerstone of my Basic GUI's capabilities.
They are indeed different. The "standard" IBM cable is wired with two motor enable and two drive enables.
As Darren correctly points out, if you take an IBM-style cable, untwist it, and then twist 10-12, you'll correctly get the motor/drive enable signals to an IBM-type 3.5 inch drive 0.
That's how I got mine wired up.
Also using switches is a great idea. I set up one drive case with a 3.5" drive, one 40T and one 80T 5.25" drives and 3 switches to select which one is drive 0 and 1. I can convert any media format to the other. That gets a smiley. :)
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