This folder contains the files required to create a disk and run FLEX 3.0 on an Altair 680
with an iCOM 360 or Pertec FD3712 drive cabinet connected through a 68-UIO board. The disk
images here (FLEX3*.DSK) are in standard 8" IBM 3740 format (26 spt, 77 sectors). Write
them to a disk using whatever computer and utility you have for writing an 8" 3740 disk.

A boot PROM must be burnt and installed in the $FC00 socket. The boot PROM can be found
in the FLEX 1.0 directory;

https://deramp.com/downloads/altair/software/altair_680/FLEX 1.0/

With the boot PROM in place, jump to $FC00 (J FC00) to boot FLEX.