This folder contains the files required to run FLEX 3.0 on an Altair 680 computer. Instead of using a disk controller, disk data is transferred through the serial port on a 68-UIO board configured to run at 38.4K baud. Instead of disk drives, a serial disk server running on a PC serves disk content. To learn more, see this video: https://youtu.be/fGtK1jCWcHk The serial disk server for Windows can be found here: https://deramp.com/downloads/altair/hardware/fdc+/ The boot disk (drive 0) should be SERFLEX.DSK. Other disk images can be loaded into other drives (or drive 0 once FLEX is booted). Numerous additional disk images are available at the link below. The disk images at this link are for the SWTPC-6800 and won't boot on the Altair 680, however, most programs on these disks will work (other than programs that are specific to SWTPC hardware). https://deramp.com/downloads/swtpc/software/FLEX/FLEX%202.0%20and%203.0%20Disk%20Images/ Use only disk images that are 88K or 100K. The 200K disk images will not work.