So back in 2019 and one of my favourite emulation apps on the Mac – Boxer (http://boxerapp.com) – stopped working.
I wrote about it here: https://heliomass.com/posts/080-the-price-of-upgrading-to-catalina/
Someone did fork the project, but it ran a lot slower than before due to issues with some of the libraries.
So for a Friday night project I might finally port over all my DOS stuff to DOSBox (or whatever’s the best DOS emulator these days on the Mac… or maybe I should just make a VM?)