MC-500 Info

The instructions below are for macOS

These instructions are an abridged version of Making floppy disk images under OS X.

• Open the Terminal application
• Insert a 3.5" double density floppy disk into your external USB floppy disk drive. It doesn’t matter if it’s already formatted, because any contents will be overwritten. Ensure the disk is not write-protected
• You may receive a message from the Finder about an unrecognised disk. If so, you can click the Ignore button
• Run diskutil list to find the identifier of your external floppy disk drive and make a note of it. It will be marked (external, physical) and look something like /dev/disk3. Important: Run this command every time you follow these instructions because the identifer could change
• Run diskutil umount /dev/disk3 to unmount the volume. Note that if you received the Finder unrecognised disk warning previously then this step is not required
• Run sudo dd if=/<full-path-to-downloaded-file> of=/dev/disk3 bs=512 conv=noerror,sync whereby <full-path-to-downloaded-file> is the full path to one of the download disk images linked above. Enter your Mac login password when requested. See below for an example of this full command
• When the command has completed, push the button to manually eject the floppy disk from the drive. Note that it’s not necessary to unmount it via the Finder of diskutil because it should still be unmounted from when you ran diskutil umount /dev/disk3 earlier

Example of the final command to write the downloaded system software image file to a floppy disk:

• sudo dd if=/Users/john/Downloads/Super-MRC-v2.dsk of=/dev/disk3 bs=512 conv=noerror,sync