Back in the day, the Atari 1030 modem (1200 baud, I believe) was Hayes compatible but did not have a ring detector. That makes it difficult to use it for a BBS

Back in the day, the Atari 1030 modem (1200 baud, I believe) was Hayes compatible but did not have a ring detector. That makes it difficult to use it for a BBS. So I ended up using a neon lamp across tip and ring to light up when the AC ringing signal hit. I placed it next to a photo resistor and hooked it up to the fire button on one of the joystick ports. The resistance didn’t drop to zero, but it was close enough. Two components with the bonus of optical isolation from the phone network!