[imoverclocked]

Time to find vulnerabilities!

I remember in the naughts, coming across a dos machine that was quite out of time… even for the university basement it was living in next to a pile of lead brick. Its only job was to run an instrument via an home-built ISA card and write data out to 5.25” floppies.

What uses would this code have in 2026?

[yjftsjthsd-h]

It's a single user OS that runs everything in ring zero by design. I'm not sure, definitionally, that it can have security vulnerabilities. I... guess maybe code execution on exposure to an untrusted floppy disk filesystem?

[aflag]

Even then, what would that accomplish in most systems? That same disk would most likely be the only permanent storage available to the system when it's inserted. Maybe if you've got two drives and have two floppies inserted at the same time?

[imoverclocked]

DOS systems often had hard drives. Also, floppy virus propagation is possible (aka: Sneakernet.)

It was a different era entirely; Writing a TSR was a right of passage. Sometimes just getting something to work without having any other motive was enough to do it.

A clever and small TSR might keep a copy of itself in memory and not require two floppies in the case of no hard drive. In comparison to today’s standards, it’s amazing what we did with 640k (or less!) of ram.

[aflag]

My friends and I didn't have hard drives. But maybe we were just poor. But fair, you could infect another disk if you just switched disks. No need to have both connected at the same time.

[greenbit]

Look closely, you'll notice there's no network interface. The only vulnerability in a system like that is physical access by malicious individuals.

About the worst mal-ware it can have is a boot sector that installs a "terminate, stay resident" (TSR) that copies itself onto any floppy that gets inserted.

[FarmerPotato]

To see what decisions they made. Like any historical document. Aim to understand the people of the time.