[Coco] 720K 5.25" drives....

[Bob Devries]

Frank,

Under OS-9/NitrOS9 the driver/descriptor for a 720k drive (5.25") will read 
a 360K disk or a 180K disk (single sided).

Some of the TEAC brand 5.25" 720K drives could be modified to work as either 
360K or 720K by inserting a switch to remove a resistor from the circuit for 
360K mode, thereby causing it to effectively double-step. I have such a 
setup (though currrently in storage).

Regards, Bob Devries

--
Besides a mathematical inclination, an exceptionally good mastery of one's 
native tongue is the most vital asset of a competent programmer.

Edsger W.Dijkstra, 18 June 1975

----- Original Message ----- 
From: "Frank Swygert" <farna at att.net>
To: <coco at maltedmedia.com>
Sent: Thursday, December 24, 2009 1:08 PM
Subject: [Coco] 720K 5.25" drives....


> Won't the 720K 5.25" drives work fine as a 360K drive? I know they are 80 
> track instead of 40, but I seem to recall they would work just fine as 
> 360K drives as well as 720K. I know they were used in the Tandy 2000, but 
> don't know about any others. There have been a few Teac models in the 
> surplus channels lately. Just thought that might be a good one for CoCo 
> users since 360K drives have pretty much dried up.
>
> -- 
> Frank Swygert
> Publisher, "American Motors Cars" Magazine (AMC)
> For all AMC enthusiasts
> http://farna.home.att.net/AMC.html
> (free download available!)
>
>
> --
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