My father still has his ZX-81. It was his first computer. I tried getting it hooked up to a modern TV a few years back but had no luck. I didn't have an oscillo

My father still has his ZX-81. It was his first computer. I tried getting it hooked up to a modern TV a few years back but had no luck. I didn't have an oscilloscope handy, and there are no LEDs or status lights of any kind on the thing, so I didn't get round to figuring out what was wrong. It's a pretty cool piece of history though. How many people can say they still have their first computer?