[DISCUSSION] What was the oldest piece of tech actively used in an environment you supported?

I'll start ...

An AS400 back in the early 2000s , used as a legacy system for a leasing company. Some old dude used to come to support it for reporting and other functions. IIRC, there was a nice orange monochrome terminal that was connected to it.

I rarely had to touch it and I left the company before they migrated to a new platform.

I'm sure I've ran into more old tech, not sure why this stuck out in my memories.