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ST-4182E Whats a good controller to get for it ESDI?

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    Thanks for all your insight and help. I was also surprised at the great BIOS setup program on the DTC controller. It automatically set the drive type as TYPE 1 and then allowed the whole drive to be used. I was also surprised that the whole error table was already presented and I did not need to enter anything. The drive speed is much faster than any MFM drive I've used and very quite. It was nice to finally explore this drive type.


      ESDI is the immediate predecessor to IDE; in fact, as far as viewed from the controller-to-PC interface standpoint, there's almost no difference--the same commands are supported. ESDI's main competition was SCSI, so there's a lot of carryover between drive models.


        I found this in the online doc's.

        Front Panel
        The WREN 3 is available with a black front panel. The panel has a
        single red rectangular LED which indicates the drive is selected when
        glowing. A flashing LED indicates the presence of a nonrecoverable
        fault. A fault indication is displayed irrespective of DRIVE SELECT

        I further read that a DTC-6000 controller has issues with using the DEBUG in DOS 5 and above. I had this issue and used DOS 3.3 to DEBUG g=c800:5 to LL format the drive then used DOS 6.22 to fdisk and format it.


          Originally posted by Al Kossow View Post
          They also get MFM vs ESDI mixed up as you found out
 is NOT an MFM drive
          People get confused because ESDI used the same 34/20 pin connector pair as ST-412(MFM/RLL) drives
          Real problem is people using MFM to refer to an interface, even though MFM and RLL define a way to store data and have absolutely nothing to do with the interface. ST-506, ST-412, ESDI, and early IDE and SCSI all can be MFM drives. So there's no "MFM vs. ESDI", because MFM is not an interface.


            Just found this on

            Known problem - POST error of 601

            Note: The following is not the result of a bug/defect.

            With the second (06/10/85) and third (11/15/85) BIOS revisions, removing the IBM Fixed Disk and Diskette Drive Adapter and substituting a third-party replacement solution can (can, not always) result in a 601 error during POST (Power-On Self Test). There is something in those revisions that expects the 'IBM Fixed Disk and Diskette Drive Adapter' (or compatible card). The symptom is not seen with the first BIOS revision (01/10/84).

            In this situation, the 601 error is the POST warning you that it not find the 'IBM Fixed Disk and Diskette Drive Adapter'.

            Note that if experienced, this does not stop the boot process; following the 601 is a prompt to press the F1 key to resume, although, operation may be compromised.

            Substituting the IBM BIOS with a third-party one, is a known workaround.

            A fix is to use a replacement solution that behaves the same as the 'IBM Fixed Disk and Diskette Drive Adapter', i.e. the POST will believe that an 'IBM Fixed Disk and Diskette Drive Adapter' is fitted.
            This is what I was experiencing with all attempts to put a different floppy controller in the computer. I'm using a XT286 motherboard with this same issue.

            It did clear up after I installed a different HD controller w/o a floppy interface and once the HD was LL formatted on re-boot the 601 error disappeared.
            Last edited by framer; July 19, 2021, 05:21 AM.