I found an article that mentioned printer drivers for Atari ST Degas and it has a bunch of different drivers for different dot matrix printers.
Hacking on a lua script made it output something recognizable for an Okimate 20.
Consulting the document "MCS-820_Printer_Handbook_(aka_Okimate_20).pdf" was indispensable.
![[Linked Image from i.imgur.com]](https://i.imgur.com/hLbZvtp.png)