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The FDX68 is an add-on device to the Raspberry Pi 3B / 3B+ (and potentially newer revisions) that enables one to emulate an X68000 floppy drive on a real X68000. This wiki page was created to mirror information found on the original creator's web site. Please reference the original web site first for the most up-to-date information.
Original web site: (http://www.geocities.jp/kugimoto0715/fdx68/index.html)
The X68000, like many other devices made in the 1990's and earlier, uses ICs that communicate on 5V rails (0V = binary 0, 5V = binary 1). Modern electronics, use 3V rails (or even less). Hence, one can't connect a micro computer like a Raspberry Pi to an X68000, as the data bus voltages are not compatible.
The FDX68 is a device that plugs into the Raspberry Pi, and voltage converts between a Pi and X68000 floppy drive port (both internal and/or external). The actual emulation of the floppy drive happens in software; a very clever Linux application that runs on the Raspberry Pi. The FDX68 emulates 2 FD at the same time; external jumpers set which drives to emulate (0/1 internal, or 2/3 external). Lastly, LEDs are included on the device to show you drive activity.
Setup and Usage:
The original author has great instructions found here: http://www.geocities.jp/kugimoto0715/fdx68/index.html Use google translate to get the details. The rest of this page was a result of edited google translate of original page (pulled 11/26/2018)
The following examples will not cover all possible combinations, but one should find the closest system and adjust accordingly based on connector and how they want to use the device. It is easiest to connect the FDX68 externally, but it can also be used internally (adjust drive assignment accordingly). Here are some important things to keep in mind:
X68000 XVI Compact: