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Thread: Missing Xtal on LCS-6610F Floppy controller card

  1. #1

    Default Missing Xtal on LCS-6610F Floppy controller card

    I found an LCS-6610F Rev B floppy controller card in the garage today. See the pic, it's a little rough; probably been sitting in the pile of pcb's for many years. Its BIOS EPROM is missing, but that can be corrected thanks to the image being on the Minuszerodegrees website.

    The real problem is in the upper left corner: the crystal X2 is missing. If anyone has one of these boards and can tell me what the xtal frequency is, I'd greatly appreciate it.
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    Last edited by precaud; September 18th, 2019 at 04:49 PM.

  2. #2

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    Since it's already been scavenged there's a good likelihood it has other problems.
    PM me if you're looking for 3½" or 5¼" floppy disks. EMail “ ” For everything else, Take Another Step

  3. #3
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    I'll venture that the missing crystal is 8MHz. But if there's an issue with the PALs on the board, you might as well continue the scavenging operation.

  4. #4

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    I don't think it was "scavenged". But we don't need to get into that.

  5. #5
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    Member Robin4 was the one who provided the ROM image for the -0° web site, which suggests that he has one of the subject cards. Perhaps send him a PM.

  6. #6

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    Quote Originally Posted by precaud View Post
    Its BIOS EPROM is missing...

    ...the crystal X2 is missing.
    Quote Originally Posted by precaud View Post
    I don't think it was "scavenged". But we don't need to get into that.
    What would you call it?
    PM me if you're looking for 3½" or 5¼" floppy disks. EMail “ ” For everything else, Take Another Step

  7. #7
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    Given the beat-up look of the card, I'm sticking with "scavenged".

  8. #8

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    Quote Originally Posted by modem7 View Post
    Member Robin4 was the one who provided the ROM image for the -0° web site, which suggests that he has one of the subject cards. Perhaps send him a PM.
    Thank you. I "scavenged" an 8MHz crystal from the pcb pile and will try it.

  9. #9
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    hello
    i have a rev: W1 , not the same card! - but here is a picture of it:

    DSCN8618.jpg

    /cimonvg

  10. #10
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    That's a very different beast--essentially a version of the WD1002FOX--used a WD37C65 FDC (or the GS clone of it). The 16 MHz crystal handles 360K, 720K and 1.2M and 1.44M densities; the 9.6 MHz crystal is there to handle the oddball 1.2M drive in low-density mode--the spindle speed there is 360 RPM.

    It could also be that the missing crystal on the OP's unit is a similar dodge; 360/300 * 4 Mhz = 4.8Mhz for the low-density mode on 1.2MB drives, but the controller is the Zilog clone of the plain-Jane µPD765A.

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