If you've seen one operate, they run incredibly fast with very precise stepper motor control. It's certainly not Linux at the lower level. I dealt with Tajima

If you've seen one operate, they run incredibly fast with very precise stepper motor control. It's certainly not Linux at the lower level. I dealt with Tajima machines back around 1999-2000 and I'm pretty sure the systems have just been step-evolved from that point onward. No Linux in sight.