The device doesn't actually need a USB cable. You could power it via the 3.5" floppy power connector. Yes, it uses any 3.5" or 5.25" PC drive.
There will also be a firmware upgrade where you can replace your Amiga floppy drive with the SCP and use it as the floppy drive, pulling the flux level images from the SD card. Control for the board can be done through the USB port, or through either of the two serial ports. One port could be for a LCD display and the other could be for communications. Or in the case of the Amiga, some simple program to get the directory info from the SD card and be able to mount a flux image. So, SCP doesn't need a PC to actually work. However, all of the software I have currently for it is PC based. I still have all of my original SuperCard Ami source code, so I can alter that to support the packet based messages that control the SCP board to give us some Amiga software.
There are already low-level drivers for the FTDI USB chip I am using for PC, Mac, and Linux. So, if someone wants to make some Mac or Linux software, please let me know and I can provide all of the details. I am making the control information public, and the image format already is. We are using that format for the FPGA Arcade so the cores can have flux-level images, insuring that we have 100% compatibility for loading original copy protected software in image format.
