[Coco] Re: Re: FD-502 controller problem

[Mark Marlette]

Charlie,

A bad processor will also give you floppy problems. A blown NMI.

All else will appear to be fine.

Mark

At 5/21/2006 08:17 AM, you wrote:

>Thanks all for the replies.
>
>I used some solder on the worn looking contacts, and then the controller
>could DSKINI 0 just fine.
>Everything seems to work good but I found anything written to drive 0 is
>unreliable. I get IO errors
>trying to read things copied to the drive, sometimes. Again switching to my
>Disto controller all is fine.
>My drive 0 was purchased from CLOUD-9 only a little more than a year ago
>(new old stock?) and
>I really doubt that it is bad. I will stop being lazy and take the cover off
>the drives and swap the cables
>see if another drive behaves the same. Otherwise I will have to search ebay
>and keep my eyes out for
>another controller.
>
>-Charlie
>
>
>"Phill Harvey-Smith"
><afra at aurigae.demon.co.uk> wrote in message
>news:446E0815.4040201 at aurigae.demon.co.uk...
> > Mike Pepe wrote:
> >> Charlie wrote:
> >>> Gene and Phil, Thank you for the replies!
> >
> > Phill :)
> >
> >>> It is not a cable / drive problem as switching to my Disto SC II
> >>> everything
> >>> works fine.
> >>> It has to be something specific with the 502 controller.
> >>
> >> All the signals that run the drives are in a parallel bus configuration,
> >> except for the drive select signals. If there were a major issue with the
> >> controller it should affect all drives the same way.
> >>
> >> The only thing that would be worth trying would be to replace all the
> >> 7406 (or 7416) chips on the controller and see if that helps.
> >
> > Yeah might be worth checking/changing them.
> >
> >> If not maybe the big 373 latch chip has a bad output for drive 0's select
> >> line.
> >
> > But wouldn't a bad drive select affect reading too ? I thought Charlie
> > said that it would load games and stuff ok.
> >
> > Phill.
> >
> > --
> > Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !
> >
> > "You can twist perceptions, but reality won't budge" -- Rush.
> >
> > --
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> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> >
>
>
>
>
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>
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