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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: curtis on March 25, 2016, 11:17:44 PM

Title: df1: bad A500
Post by: curtis on March 25, 2016, 11:17:44 PM

Okay, working on a rev. 6a A500.

Any diskette I pop into an external floppy drive comes up "DF1: Bad".

Tried 2 different externals with same result.

Diskettes read just fine in df0:

Trying to refresh my memory and can't remember if it's CIA even or odd or some other chip I need to be looking at.

Help please?

Curtis

Title: Re: df1: bad A500
Post by: mongo on March 25, 2016, 11:18:44 PM

Swap the two CIAs and see if it makes any difference.

Title: Re: df1: bad A500
Post by: Oldsmobile_Mike on March 25, 2016, 11:24:51 PM

Does the CIA chips have any effect on an external drive?  I'd have to look that one up.  Obvious question would be can you test the external drives on another Amiga?  Before you start yanking chips, that's what I'd do.  ;)

Title: Re: df1: bad A500
Post by: mechy on March 26, 2016, 05:27:53 PM

Swap CIA's and see if there are any changes. Check Paula.. swap with known good one.
also U36 and u37 ttl chips.. are any hot? either case one or both could be bad.

Title: Re: df1: bad A500
Post by: curtis on March 26, 2016, 11:04:56 PM

Okay, an update.

Swapped CIA's with no apparent effect.

Tried a known good Paula.  Nada.

Ditto Gary.

U36 and U37 at normal temp.

On a whim, I tried a new Workbench (an original diskette) in DF0:.  Don't ask me why, just a gut feeling.

Suddenly DF1: is reading!

Stuck my first WB in DF1: and it reads as bad!  Glad it's a copy.

Tried to copy my real original 1.3 WB to the suddenly bad WB disk and now 2 external drives are saying it's write protected.  And yes, I know which was the tab goes!

I'm thinking it's time to shut down for the evening, eat supper, feed the dogs, and watch Gravity.  Can't beat seeing Sandra Bullock in her space underwear to clear my head a little.

BTW, someone remind why I'm still working with real hardware and not an emulator?

Title: Re: df1: bad A500
Post by: paul1981 on March 26, 2016, 11:47:54 PM

Because real hardware is real.

Title: Re: df1: bad A500
Post by: mechy on March 27, 2016, 03:37:13 AM

real hardware rocks.. emulators are lame..

If you have enough of these troubles you learn what to do to fix them :)

i hope you get it worked out.

Title: Re: df1: bad A500
Post by: curtis on March 28, 2016, 09:38:52 PM

UNBELIEVABLE!!!!!

So, something in the back of my head told me to switch df0:  Tried another drive and ALL problems cleared up!  Except for the floppy in df1: needing formatting.

Looked at my original internal drive and lo and behold, it's missing a pin!  Guess which one?  Yup, write protect!

Not sure why the write protect pin missing on the internal drive would affect the external drive, but it did!

Do have to admit, Amigas have much more unique problems!