My biggest take away here is that old MS-DOS has been made free software. I had a Compaq Portable that I’m restoring, and I gave half a though to combining my love of retro hardware with free software and running FreeDOS even if it is a bit of a resource hog. But I think this machine(its the original version of the Compaq Portable) came with DOS 2.something, so the now open source DOS 2.0 might work without the performance hit of FreeDOS. Neat.