[Coco] 8inch floppy on a coco

[rietveld rietveld]

I know that the pair of 8 inch external drives do work

I have had them connected to my model 16

________________________________
From: Coco <coco-bounces at maltedmedia.com> on behalf of Salvador Garcia via Coco <coco at maltedmedia.com>
Sent: May 17, 2018 10:41:02 AM
To: CoCoList for Color Computer Enthusiasts
Cc: Salvador Garcia
Subject: Re: [Coco] 8inch floppy on a coco

Actually, hardwarewise, the two floppies are not all that different. I recall back in the early 90s we got hired by bank to come up with an interface so that they could stop using 8" drives with their Phillips PTS system. Instead, they wanted to use a high density 1.2M floppy drive. My colleague, who was responsible for the hardware, found that most of the signals were compatible, expect a for a few (maybe even just one). The incompatible signal(s) just needed to be inverted. Softwarewise, it was not straightforward at all. The floppy's format used a standard IBM format which was different than anything used by MS-DOS PCs. I had to bypass the ROM BIOS (venerable INT 13h) and write my own drive access routines (using ROM BIOS code as a template).

Salvador


    On Wednesday, May 16, 2018, 9:26:17 PM CDT, Sean <badfrog at gmail.com> wrote:

 I didn't think an 8 inch drive would work with a CoCo?  Isn't it a
completely different data rate and size than what a disk controller
supports?

On Wed, May 16, 2018 at 7:28 PM, rietveld rietveld <rietveldh at hotmail.com>
wrote:

>  I apologize for how badly my phones 'auto correct ' Un corrected my post
>
> I am just really excited to finally be able to use these drives
>
> Sent from my BlackBerry Passport Red Edition.
>  Original Message
> From: rietveld rietveld
> Sent: Wednesday, May 16, 2018 8:26 PM
> To: Coco mailing list
> Reply To: CoCoList for Color Computer Enthusiasts
> Subject: [Coco] 8inch floppy on a coco
>
>
> I finally scores some new old stock 8 inch disk. I am hooking an eight
> months inch drive to my coco as we speak.
>
> I am going to post a video showing how ridiculously cool this looks.
>
> Sent from my BlackBerry Passport Red Edition.
>
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