[Coco] High density drives with the CoCo

[Mark Marlette]

Allen,


I have a controller that has been modified as Robert Brose from or local user group was the one that created this mod and driver patches. It is a monster of a hack. Pretty much like making a controller by hand. I just looked at it the other day.

It does work very well, I even modified the hardware even further to automatic sense the floppy type and adjust the data transfer rate.
To the best of my knowledge, the high density mode of 500Kbps(digging deep in to memory on this number)  is only available on the older WD177x, 40 pin versions(+12V). 

May be the J&M can do it, that I am not sure of.

Regards,
 
Mark Marlette
http://www.cloud9tech.com
mark at cloud9tech.com
mark at gamecamaddict.com



________________________________
From: Allen Huffman <alsplace at pobox.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
Sent: Thursday, April 27, 2017 8:29 AM
Subject: Re: [Coco] High density drives with the CoCo



On Apr 27, 2017, at 6:37 AM, Francis Swygert <farna at att.net> wrote:
> 
> Created a new topic for this!  There is a mod to the old 12V disk controller that will allow high density drives. Requires a  good bit of work, and you need to find a good working old controller. Then you need to supply it with 12V. Easiest way is to use a Multi-Pak, but you could hack it for a wall-wart (make sure it's well regulated though!) or other external power supply. The CoCo1 had 12V on the cartridge port, no others did though.

Recently, maybe at the fest, someone told me there was also a mod for the later floppy controllers. I'd never heard of this. Anyone know about it?


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