Gotcha! Okay, perfect. I guess didn't realize the Serial.begin function is used also for sending data in and out of the Arduino on pin 1 and 2 - I've only ever used it as the serial monitor. Never even occurred to me... That makes perfect sense to me, now!
Okay, cool. I've heard about bit banging, but never read a technical description of what it was exactly. Just wanted to branch out after getting that (mostly) complete and interface with "correct hardware" - an external ACIA attached to the 65c02 data line.