[Coco] TEAC FD55-E speed adjustment

Bob Devries bdevries at gil.com.au
Mon Feb 13 23:19:40 EST 2006

How does your programme keep its timing correct? If it uses the HS or FS 
interrupt from the PIA, then it will not be accurate on the PAL colour 

Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Robert Gault" <robert.gault at worldnet.att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, February 14, 2006 1:42 PM
Subject: Re: [Coco] TEAC FD55-E speed adjustment

>I can supply a program I wrote that graphically displays the drive speed. 
>It is much easier to use than the strobe wheel and give the results in a 
>quantitative value of RPM and % deviation.
> Gene Heskett wrote:
>> On Monday 13 February 2006 11:41, James Hrubik wrote:
>>>Gene, is it going to make a difference if the flourescent is running
>>>under 50hZ or 60hZ AC?  I was under the impression that the frequency
>>>of the AC was the determining factor in the strobe effect of the
>> Obviously it will, but normally the strobe sticker has 2 sets of stripes, 
>> one for 50hz, and one for 60hz.  Not being able to see the one Torsten 
>> has, I am of course shooting wildly in the dark at anything that moves & 
>> makes a sound.  :-)
>>>On Feb 13, 2006, at 11:29 AM, Gene Heskett wrote:
>>>>On Monday 13 February 2006 04:40, Torsten Dittel wrote:
>>>>>Does anyone know how to adjust the speed of the TEAC FD55-E drives
>>>>>(that's a 1-side 80track 360KB 5.25" drive? There are two pots,
>>>>>one of
>>>>>them on the motor's PCB, I guess it's that one but I need to have
>>>>>confirmed by someone who knows...
>>>>Does it have the strobe pattern on the bottom of the spindle?  Thats
>>>>easily watched under a flourescent light, when it stands still
>>>>rather than creeping on direction or the other, you have the right
>>>>speed. Adjust the pot on the motor pcb for effect after noting where
>>>>it is in case its not the right pot.
>>>>Cheers, Gene
>>>>People having trouble with vz bouncing email to me should add the
>>>>word 'online' between the 'verizon', and the dot which bypasses vz's
>>>>stupid bounce rules.  I do use spamassassin too. :-)
>>>>Yahoo.com and AOL/TW attorneys please note, additions to the above
>>>>message by Gene Heskett are:
>>>>Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
>>>>Coco mailing list
>>>>Coco at maltedmedia.com
>>>-----Items below rated "R"; parental discretion advised----
>>>"I have an excuse : all of my ancestors were teenagers..."
>>> From the sayings of Grampa Jim, Copyright 2003.
>>>Unauthorized use of my stuff may cause senility.
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