Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!samsung!interlan.InterLan.COM!interlan.interlan.com!yetsko
From: yetsko@interlan.interlan.com (Mike Yetsko)
Newsgroups: comp.os.os9
Subject: Re: adding as disk drive to COCO3
Message-ID: <YETSKO.91Jan2125053@interlan.interlan.com>
Date: 2 Jan 91 17:50:53 GMT
References: <Jan.2.12.25.00.1991.24309@pilot.njin.net>
Reply-To: yetsko@interlan.interlan.com
Followup-To: comp.os.os9
Distribution: usa
Organization: Racal InterLan, Inc., Boxborough, MA (1-800-LAN-TALK)
Lines: 8
In-reply-to: roccella@pilot.njin.net's message of 2 Jan 91 17:25:02 GMT

The coco takes standard 360K floppies, not 1.2Meg.  360K floppies spin at 
300rpm, 1.2M units spin at 360 rpm.  While you CAN make stuff like 720K
units work, they still use 250KHz clock rate.  1.2Meg floppies use 500KHz
for 1.2Meg format and 300KHz data clock rates when doing 360K diskettes in
the 1.2Meg drive.  (300KHz clock at 360 rpm yeilds the same flux density
as 250KHz at 300 rpm.)  The Coco controller will only work at 250KHz.  

Mike Yetsko