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24998Re: [midatlanticretro] Re: 8" of not working Floppy Disk.

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  • B Degnan
    Apr 1, 2012
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      I am starting to think you may have a partial port assignment
      problem. Maybe someone who knows more about the 1771 and Tarbell can
      yey or ney this.
      bd

      At 01:40 PM 4/1/2012, you wrote:
      >Hi Guys...
      >
      >I'm still banging away at this 8" Disk Drive.
      >
      >One drive definitely has a problem with the read amp.
      >The other drive seems to work fine, but it's my controller card
      >that's giving the problem. Tarbell 1011.
      >
      >The Data/Clk seperator isn't working most of the time on most of the
      >data patterns. But it does work some times when I record a track of
      >0AAH's. When it reads back, it either reads as AA's, 55's or FF's.
      >I can understand being off a bit and getting the 55's since there's
      >no syncronizing, but the FF's is what I get 3 out of 4 times I read
      >the same track. And if I write a track full of 0F0H's, then I only
      >ever get a bunch of FF's back, no matter how many times I read. So,
      >now my task has switched to understanding / repairing this seperator.
      >
      >When I'm not reading the disk (and the head is not loaded), I get
      >the occassional data pulse from the disk, is this normal? Just noise?
      >
      >Does anyone have any idea why Tarbell would use their own data/clk
      >seperator and not the one inside the WD1771 chip?
      >
      >Thanks for your ideas!
      >
      >Cheers,
      >Josh
      >
      >
      >
      >
      >------------------------------------
      >
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      >
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