[Coco] Re: [Color Computer] Tandy FD-502

[Gene Heskett]

On Friday 28 January 2005 13:17, Dave wrote:
>Thanks Gene.....!
>
>1- I have a "new" Mitsumi D509V5 1.2 sitting on the shelf unused but
>haven't found any detailed doc's for it. There is one 2 position
>jumper marked on it and it's called "0" as in zero. Looking for real
>360's however....There are other markings for drive select but they
>would have to be soldered, judging from the design....
>
>2- I'll add one.....I also noted that the 502 case has some
>ventilation holes in the case as compared to the 501 I scrapped....a
>good idea....
>
>3- My concern was that older e-caps tend to dry out over time. As I
>don't have an in-circuit ESR meter to test, my concern is a cascade
>failure of other componenets which would be harder to replace. (i'm
>probably being over-cautious)
>
I don't know if I'd be that concerned over 'cascaded' failures 
generally.  The "Capacitor Wizard" is about the best of the esr 
meters I'd been able to use, very simple to setup and interpret its 
readngs.  Works right on the unplugged pc board as its a 100 
kilohertz measurement, at about 85 millivolts total signal level.

>Thanks for your help and comments.....
>
>Cheers Dave (CET also)
>
>--- In ColorComputer at yahoogroups.com, Gene Heskett
>
><gene.heskett at v...> wrote:
>> On Friday 28 January 2005 08:58, Dave wrote:
>> >Well, my auction arrived today and it's in great shape....!
>> >
>> >What are the options to add a second drive to this unit?
>> >
>> >1- Can I use a 1.2 drive?
>>
>> Only if its jumpered for 300 rpm, making a 720k drive out of it at
>
>the
>
>> coco controllers available kilobaud data rate.  Most of them can
>
>be
>
>> jumpered to slow them down.  The default 1.2 meg spindle speed is
>
>360
>
>> rpm, which at the coco's baud rate, would equal 15 sectors per
>
>track
>
>> as opposed to 18 sectors per track.  So theoreticly a 1.2 could be
>> used, but at 600k actual capacity.  All my drives have had the
>> jumpers, so I personally have not tried that, under os9/nitros9 of
>> course, not the builtin basic.
>>
>> Marty Goodman is probably the best record keeper in terms of
>
>knowing
>
>> about these drives, so if you can get him the exact model # & make
>
>of
>
>> the drive, he may be able to tell you where and how this jumper is
>> marked on the drives pcb.
>>
>> >2- Is the fan really required? I've read articles pro and con...
>>
>> I'd recommend it, its not that noisey in most cases.
>>
>> >3- By default, should I be replacing the e-caps on some of these
>> >power supplies as this "is" vintage equipment....and should this
>> >include the CoCo's?
>>
>> Thats a question I've asked myself a few times, but so far I've
>
>not
>
>> had any simptoms of bad e-caps, so I haven't. As I'm a CET,
>> replacement is not a big deal to me as I have the tools & a good
>
>temp
>
>> controlled iron already.
>>
>> I'd be a little more wary of the ones in the drive boxes power
>
>supplys
>
>> than most of them, but of the RS drive boxes I have, so far only
>
>one
>
>> has gotten to the point it needed fresh ones.  It sat in a rack at
>> the tv station for 13 years, running 24/7, without any huge amount
>
>of
>
>> air moving around it so it did run warm so they were replaced
>
>while I
>
>> was replaceing a worn out drive about 3 years ago.
>>
>> --
>> Cheers, Gene
>> "There are four boxes to be used in defense of liberty:
>>  soap, ballot, jury, and ammo. Please use in that order."
>> -Ed Howdershelt (Author)
>> 99.32% setiathome rank, not too shabby for a WV hillbilly
>> Yahoo.com attorneys please note, additions to this message
>> by Gene Heskett are:
>> Copyright 2005 by Maurice Eugene Heskett, all rights reserved.
>
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>Yahoo! Groups Links
>
>
>

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
99.32% setiathome rank, not too shabby for a WV hillbilly
Yahoo.com attorneys please note, additions to this message
by Gene Heskett are:
Copyright 2005 by Maurice Eugene Heskett, all rights reserved.


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