[Coco]Re: Transfer utilities

[jdaggett at gate.net]

On 9 Oct 2005 at 13:45, Roger Merchberger wrote:

Date sent:      	Sun, 09 Oct 2005 13:45:46 -0400
To:             	CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
From:           	Roger Merchberger <zmerch at 30below.com>
Subject:        	Re: [Coco]Re: Transfer utilities
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> So you're saying with that mod that it's possible to have up to 8
> drives?

With a minor mod. The 179x series of controllers were capable of using either 8 or 5 
1/4 disks. Take the clock signal to the 1793 from U1 pin #6  instead of pin#8 and the 
controller should work with  8 inch drives. 8 in drives requires a 2 Mhz clock. 


If   you redo the clock circuitry and be able to switch between 2MHz, 1.2MHz and 1 
MHz clocks the 1973 will handle all the 5 1/4 as well as the 3.5 in floppies. This 
includes 1.4 and 1.2 Mbyte floppies. 

A better approach would be to use the WD 2793 or WD 2797 chips. THen you have 
the best of both RS controllers. A controller that is capable of various density and a 
single 5 volt supply.


james