https://publiclab.org/notes/rmeister/07-18-2016/webjack-testers-needed#c15006

looking for ATTiny softmodem, i find:

https://github.com/l1q1d/SoftModem-for-attiny85
http://fab.cba.mit.edu/classes/863.12/people/Adam.Marblestone/AHM_week11.html

Maybe we can port in the mods which made it work on the Tiny architecture: l1q1d/SoftModem-for-attiny85@b6f08ca

Also happy to move this to your SoftModem fork instead of having it here