Disk Controller Expansion Kit


This kit is no longer available. If you want to build you own, look at the “Construction Files” section below.

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This is a limited-time product.

This is David Hansel’s Disk Controller expansion board for the 26-pin bus paired with an acrylic case. You can read more about this board at David’s Github.

This includes the circuit board and all necessary components, including an ATMega328p programmed with MITS firmware, to replicate the function of the MITS 88-DCDD 8-inch controller, which can be used with an authentic SA-800 8″ drive (hard to find) or used with a more readily available TEAC 5.25″ drive. A brief assembly/instruction guide is provided, but you should also visit the Github and OSHWLab pages for construction.

I have also created an acrylic case that pairs nicely with the Altair-Duino Pro.

You will need to source the following parts on your own (links provided for your convenience):

  • TEAC FD-55GFR 5.25″ drive or TEAC FD-235HG 3.5″ drive (with 5.25″ tray adapter)
    (Other drives may work but these are the drives that have been officially tested.)
  • Mean Well RD-35A power supply (link)
  • AC power cord (link)
  • Floppy drive power cable (link)
  • Floppy drive data cable (link)
  • (4) #6-32UNC mounting bolts

Assembly instructions for both the controller card and acrylic case are available at this link.

Construction files

If you want to build this case and have access to a laser cutter, you can download the following files and make your own. These files are in LightBurn format, which is a cross-platform application with a free 30-day trial.

LightBurn Files
Also be sure to download the instructions above for the misc parts you will need.