Yep. They just used two half bytes for the last numbers in the date. The “19” in “19XX” was assumed.
So after 99 was 00.
Fun fact, Apple computers didn’t use 1900 as their start point. The oldest Macs won’t face any problems till, IIRC, 2040.
“Fun fact, Apple computers didn’t use 1900 as their start point. “
Neither did Windows.