Progress from last sunday at Chaostreff: We got our Erika 3004 type writer to type fast and error free by getting hardware flow control for its serial port to work. We tried first with a FT232RL-based USB-serial adapter, but it's flow control implementation is not fast enough: if the Erika signals "stop sending", it continues sending for up to 3 characters, which the Erika can't handle. But a Raspberry Pi can react fast enough if configured correctly, so now we can remove a bunch of pessimistic sleeps from the code.
I also worked on hooking it up as a terminal to other programs, so we hopefully can run text adventures or something on it for CCCamp.