[Coco] Re: Floppy drive problem need help

[Charlie]

Thanks for the info. If it was termination wouldnt it have been fixed when I 
tried it as drive 1?
I can upload some picture of the drive and put them on my web space. I'll 
post links to the pics here
and maybe someone can help spot this termination component.

-Charlie

"Warren Hoslet" <dermunda at hotmail.com> wrote in 
message news:BAY107-F23A85CE290EA1DF4F2B85ECF5E0 at phx.gbl...
> >I am having a problem with a floppy drive I purchased from Cloud-9 a 
> >while
>>ago. It is an ALPS Electric Co.
>>Model DFC222B02A. I purchased it as new old stock.
>>
>>The problem is that when using a Tandy FD-502 disk controller the Alps 
>>drive
>>will not DSKINI under RSDOS
>>or boot Nitros9, when it is used with another drive on the system. When it
>>is used by itself it works fine.
>>
>>Normally this Alps drive is my drive 0 and I have an IBM XT drive (YD-580)
>>as drive 1. With a Disto SCII
>>these drives work fine together. When I use a FD-502 the Alps will not 
>>work
>>as described above.
>>
>>I have tried different Coco 3s, different ribbon cables, I even moved the
>>Alps drive to drive 1 and it acted the
>>same. Still the same problems. I have a Panasonic 360K drive. I tried it
>>with the Alps drive and had the
>>same problems. When I removed the Alps drive and used the Panasonic and 
>>the
>>IBM XT drive together everything
>>works fine.
>>
>>So to be exact, I can't use this drive in a two drive system. With all the
>>swapping and testing I am able to do it can
>>be nothing other than the drive. What gets me is why it works with another
>>drive using a Disto SCII and I only have these
>>problems with a FD-502 controller.
>>
>>The Panasonic drive belongs in my Win98 PC I use to make CoCo disks, so 
>>this
>>will leave my coco with a single drive.
>>Does anyone have ideas about what the problem is or should I start looking
>>for another IBM XT YD-580 and forget about
>>this Alps drive?
>>
>>Thanks!
>>
>>-Charlie
>>
> -
> Sounds like it may be a termination problem. Only one drive in the chain 
> should have terminating resistors, and it should be the drive located last 
> on the cable (furthest from the controller). Sometimes you can have 
> multiple drives with termination and everything works fine, other times it 
> won't.
>
> You can usually remove termination from a drive by either changing a 
> jumper, or removing a component. The component style is usually a colored 
> (blue for instance) DIP or SIP in a socket. Most 3.5 inch drives don't 
> have removable termination, so if you have one of those, you should keep 
> it in the last slot on the cable and remove termination from your other 
> drive.
>
> Good luck!
>
>
>
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