For #doscember my favorite DOS software is STSPlus by the late Dave Ransom. This was a fixture on my computer screen for many years. Still works ;)

It was just a few months ago that I started to get back into 8-Bit computing. It started with Ben Eater’s Breadboard 6502 build. Something about his complete exploration of that build including single stepping the clock and watching the processor registers was really compelling to me.