I'm very much an amateur tinkerer when it comes to electronics. My formal training amounts to the digital electronics requirements from my CS degree in the early 90s. I'm also a bit of a blinkenlights fan, having grown up in the 60s and 70s.
All of that said, I have some older (< 10MHz) computers that I'd like to create some "front panel" displays for. To this end, I'd like to "tap" the address lines and bring them out to LEDs. I'm concerned about (intuitively... not with any informed knowledge):
Feedback into the bus lines from the additional line driving a transistor that drives an LED each.
Drawing too much power through the address line in an effort to drive the LED.
My thoughts are to create a simple high impedence buffer that drives a transistor that ultimately powers each LED.
Am I way overthinking this, are my concerns valid, and am I missing anything important that I should be worried about but haven't thought of?