Back in the early 90s I've discovered that there's not really any backchannel happening when printing to a dot matrix printer over the parallel port. And adding multiple ISA parallel port cards set to same IO address wouldn't cause any hardware issues, but just spit out the same data on all cards.

Which meant, as long as no paper was jamming, I could send data all three printers I had access to at the time could understand, and would save 1/3rd of printing time by having everything spit out in parallel.

My mother (parents bedroom adjacent to mine) did not think that'd qualify as ASMR at 2 in the morning.

If you like that printer sound, you’ll love the FLOPPOTRON 3.0

https://youtu.be/3KS02q0BUnY?si=roYiok0-UxLVk-8t