Forum Rules and Etiquette

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Cromix running on ZEMU emulator

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    Originally posted by MattisLind View Post
    Interesting coincidence!
    Nice website of your's by the way!

    I just pulled mine off the shelf and took some inventory.
    It has an inspection date of 4-8-85 and contains the following cards:
    ZPU , 256KZ, STDC, TUART, 64FDC

    I wasn't able to identify the model hard disk or floppy drive, would need to dismantle it some more. Very impressive chassis though, super compact and heavy duty. I have not tried powering on, will have to do some voltage checks first. If you are successful in imaging the hard disk, I'd like to know how you did it!


      Originally posted by new_castle_j View Post
      Nice website of your's by the way!

      Originally posted by new_castle_j View Post
      I wasn't able to identify the model hard disk or floppy drive, would need to dismantle it some more. Very impressive chassis though, super compact and heavy duty. I have not tried powering on, will have to do some voltage checks first.
      There were some 4-5 screws on the bottom side that needed removal to get the floppy and hard disk loose. The PSU is very simple so it will probably work fine. I used a variac and all cards / drives removed just to be sure.

      Originally posted by new_castle_j View Post
      If you are successful in imaging the hard disk, I'd like to know how you did it!
      Actually I did manage to image the drive. At least a raw dump using David's MFM emulator. But then to analyze that dump require some coding. I hope that David can help me out here. The format of the STDC is not yet supported by the analyzer software in the mfm emulator. There is only one 10240 bytes sector on each track! The track format is not near like any other controller, like WD, Xebec, Adaptec or OMTI as far as I can see.

      I have put the images here if anyone likes to play around with them. I did several dumps just to be sure now when the drive was spinning. The drive was quite noisy so I am not sure how long it will survive.


        Originally posted by TonHek View Post
        I have included some pictures to clarify

        I cannot find a 34 pin connector on the drive itself.. It's 26 pin.

        So, might this be a "new" IMI drive interface.?

        The controller in the cabinet is also IMI branded.

        Ton Hekstra
        "AND-0FH" Hard/Software Solutions
        The 26 pin connector is the "old" C drive interface.
        What you are looking for is inside an H drive.

        They were IMI 5012 or 5018. The 5007 is the original B series interface.
        You can find brochures for the drives under

        If what you need is a drive with a 20 and 34 pin interface, there are many models of ST412 compatible drives that should work
        You can always ignore the extra heads/tracks of a larger drive.


          I also played around with Z80 Cromix via the emulator, impressive what a Z80 can be made to do:


            I assume a lot of folks here already know about this, but for those that don't, you can also use Udo Monk's z80-pack emulator to run a turnkey Cromix setup, complete with a 3D model of a Z-1, blinkenlights and all. I've been using the virtual IMSAI in z80-pack for the last few months to develop and test a custom monitor for my (real) IMSAI. Cromemco support is a relatively recent addition (late 2014), and the very latest builds even have Dazzler emulation.
            Attached Files


              Well, I didn't know that, even if I have used z80pack before. So thanks!