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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

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Seagate 5.25" MFM hard drive boards

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    Seagate 5.25" MFM hard drive boards

    I have some boards for vintage Seagate 5.25 Half-height hard drives if anyone needs board repair/replacement.

    ST-225
    ST-238r
    ST-251

    tested and working... several choices of each for best match.

    I'm open for trades or offers. Let me know what you need, thanks!

    I also have some working ST-225 and ST-238r drives in excellent condition I could trade in kind for other good working drives. I'm looking for Seagate 5.25" half-height MFM/RLL drives to round out my collection ... currently looking for:
    ST-206,
    ST-212
    ST-213
    ST-250
    ST-252
    ST-277
    ST-278

    Thanks!
    Last edited by chris_nh; January 20, 2021, 06:54 PM.

    #2
    Is the ST251 board still available? if so, please send me a PM.

    Comment


      #3
      Was there really a 5MB version of the ST-212 (ST-206)? A quick google search reveals nothing and I’ve never seen it mentioned anywhere before. Didn’t know about the ST-278 either!

      Glad to see someone else who collects these old drives too! They need to be saved just like the computers themselves do! I think having an old PC with a real MFM drive in it adds a lot of character.
      Compaq - It simply works better

      Comment


        #4
        On this topic - I recently bought a couple of ST-251's locally. I do have an IBM 5150 that I'd like to install one into. I then got a WD1002A-WX1 off eBay - is that the right type of controller card to use for one of these? I'm not really sure where to go next. The 5150 is currently configured for dual floppies.

        Comment


          #5
          It depends which bios revision is on the WD controller, I think. If it allows dynamic configuration or if the jumpered settings for the bios version you have allow for the particular specs of the drive, then it should work. Also, you need the latest BIOS version for the 5150, if you don't already have it it. You probably need an XT class power supply too, as the 5150 63.5 watt power supply probably isn't enough.

          The dynamic setup of the WD also asks a LOT of questions that other controllers typically don't. Fortunately Seagate has provided the answers here: ftp://ftp.seagate.com/pub/techsuppt/misc/hints.txt

          Comment


            #6
            Thanks.. this controller card has the BIOS/ROM chip installed but with no markings/labels. Just the bare window. The 5150 I have in mind for this I believe does have an upgraded PSU, though I'm not sure on the wattage. Its labeled "IBM-1800841" I couldn't find much online about it. Luckily this machine does have the latest 1501476 BIOS.
            Last edited by nullvalue; February 11, 2021, 07:39 AM.

            Comment


              #7
              If you go into setup using debug, g=c800:5 (assuming the jumpers are default) and if it asks about dynamic configuration, it will probably work with just about any drives, though on occasion there are hardware limits like a maximum of 8 heads, etc but the ST-251 won’t exceed those.

              Comment


                #8
                Apologies to the OP, I started a new thread for this topic here.

                Comment


                  #9
                  Topic started here : http://www.vcfed.org/forum/showthrea...667#post654667
                  for the vaporware drives, ST206 and ST278

                  Comment


                    #10
                    Hey, are any of those ST-251 boards still available?

                    Comment

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