Sequential circuits samplers

Well, I replaced the 7406 buffer chip between the floppy controller and 
the drive, and while the individual logic is better on the chip, it
did not resolve my "nD" issue.

My drive seems to be spinning all the time while a disk is in it,
with the red LED on.  Is this normal?  I don't remember.

Rob

Henrik wrote:
>  
> 
> It was a temporary problem on mine. Now it works again.
> 
> --- On *Tue, 10/13/09, Rob Miller /<dpc318@...>/* wrote:
> 
> 
>     From: Rob Miller <dpc318@...>
>     Subject: Re: [prophet2000] Re: Nothing but "nd"
>     To: prophet2000@yahoogroups.com
>     Date: Tuesday, October 13, 2009, 3:03 AM
> 
>      
> 
>     Well, I might be making some progress. There's a "buffer" chip, a 7406,
>     that's identified as U201. It sits between the floppy controller and
>     the header P202. On two of the hex inverted pairs they don't seem to
>     be inverting the signals. Namely, pins 1/2 and 3/4.
> 
>     Does anyone have a clean copy of the schematics? I'm having a hard
>     time ready what each of the pins do on the online version. This is
>     on what appears to be drawing SD 2000-2.
> 
>     This is a very inexpensive part, so I might just pull it, socket
>     a new one, and try.
> 
>     Rob
> 
>     Henrik wrote:
>      > Same problem here too.
>      >
>      > --- On Thu, 10/8/09, j. aaron <tomkah@yahoo. com
>     </mc/compose?to=tomkah%40yahoo.com>> wrote:
>      >
>      > From: j. aaron <tomkah@yahoo. com
>     </mc/compose?to=tomkah%40yahoo.com>>
>      > Subject: Re: [prophet2000] Re: Nothing but "nd"
>      > To: prophet2000@ yahoogroups. com
>     </mc/compose?to=prophet2000%40yahoogroups.com>
>      > Date: Thursday, October 8, 2009, 10:51 PM
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      > ive experienced this same problem
>      >
>      > the original 2002 drive died, so i picked up a suitable
>     replacement on ebay
>      >
>      > making sure the jumpers were correctly aligned
>      >
>      > same thing, ...drive powers up, disc takes a spin and then 'nd'
>      >
>      > since that drive only cost me $10, i decided id try buying another
>      >
>      > suitable replacement off ebay (different model than the first),
>     that i also jumper configured correctly and got the the same result
>     ...'nd'
>      >
>      > i tried switching things around a bit but sort of gave up on it
>     at that point
>      >
>      > im still over $40 ahead of the $70 whine country wanted for a new
>     one,
>      >
>      > so i figured eventually ill try getting another one off ebay sometime
>      >
>      > and repeat the process, but i really couldnt find a reason why
>     those drives werent functioning
>      >
>      > this discussion has rekindled my interest in getting my 2002
>     going again
>      >
>      > i put a ton of work into sampling back in the late 80's/early 90's
>      >
>      > and id like to revisit some of those sounds
>      >
>      > ...heres hoping help arrives!
>      >
>      > -yeller
>      >
>      >
>      >
>      > --- On Thu, 10/8/09, Rob Miller <dpc318@sbcglobal. net> wrote:
>      >
>      >
>      >
>      >> From: Rob Miller <dpc318@sbcglobal. net>
>      >
>      >> Subject: Re: [prophet2000] Re: Nothing but "nd"
>      >
>      >> To: prophet2000@ yahoogroups. com
>      >
>      >> Date: Thursday, October 8, 2009, 12:06 PM
>      >
>      >> I didn't change the jumper on the
>      >
>      >> factory drive that selects DS0, and
>      >
>      >> the replacement from WC doesn't have any. The power
>      >
>      >> cord has to flip
>      >
>      >> between the stock and the replacement (and the
>      >
>      >> replacement instructions
>      >
>      >> indicate so). I have flipped back and forth the data
>      >
>      >> cable, since there
>      >
>      >> is no real keying to it.
>      >
>      >> I hope it's not the driver chip. I can replace
>      >
>      >> it, but it should would
>      >
>      >> be easier not to. The drive spins up on power up, but
>      >
>      >> doesn't seem to
>      >
>      >> seek when I try to move data to/from it.
>      >
>      >
>      >> I'll keep poking around and see if I can get the right
>      >
>      >> combo working
>      >
>      >> now. I appreciate the forum's help!
>      >
>      >> Rob
>      >
>      >
>      >> duncan wrote:
>      >
>      >>> have you got the jumpers in the right place on the
>      >
>      >> drives? I hope when you say "flipped" you don't mean
>      >
>      >> "reversed".. .. I killed a floppy drive doing this by
>      >
>      >> accident.
>      >
>      >>> the floppy disc driver chip is fairly standard, I
>      >
>      >> think, but would be a tricky job to replace....
>      >
>      >
>      >>> I have the boards from my 2000, which had a dead
>      >
>      >> keyboard controller (which WC couldn't help with- it was a
>      >
>      >> custom IC)... let me see if I can locate anything useful on
>      >
>      >> them for you, & let me know how you get on. I have to
>      >
>      >> strip some bits off them for another forum member whose
>      >
>      >> patience must be running out by now.... :-/ I've been a bit
>      >
>      >> busy this year....
>      >
>      >
>      >>> --- In prophet2000@ yahoogroups. com,
>      >
>      >> Rob Miller <dpc318@...> wrote:
>      >
>      >>>> I'm hoping I can get some help here....
>      >
>      >
>      >>>> My 2000 is now running 4.3b with a brand new
>      >
>      >> drive...but it STILL
>      >
>      >>>> gives me "nd" (no disk) whenever I try to do
>      >
>      >> anything with the
>      >
>      >>>> drive. I can't read factory disks on power
>      >
>      >> up, nor can I load
>      >
>      >>>> single sounds, and I can't format a disk. I
>      >
>      >> get the same "nd"
>      >
>      >>>> every time.
>      >
>      >
>      >>>> I've flipped the drive cable, and now have two
>      >
>      >> drives (original
>      >
>      >>>> and WineCountry new one) and they perform the
>      >
>      >> same.
>      >
>      >
>      >>>> Rob
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >> ------------ --------- --------- ------
>      >
>      >
>      >> Yahoo! Groups Links
>      >
>      >
>      >
>      >> mailto:prophet2000- fullfeatured@ yahoogroups. com
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