I can't reply to the parent anymore, but I just went back to HN after a week of busy work: thanks a lot for the details, jmechner, that's quite interesting :)

I can't reply to the parent anymore, but I just went back to HN after a week of busy work: thanks a lot for the details, jmechner, that's quite interesting :) I don't have enough time on my hands to dig into the old source code (nor I am particularly interested in the Apple II), but I'm glad to know it's available, should I or some others be suddenly curious to dig in. I much prefer such code to be opened than to be lost to history! So, it's a bit like register banks [1] or an MMU, where you have to page in and out part of the address space, I guess? I've seen some people [1] argue that we needed less powerful machines and to break backwards compatibility, for people to get creative again. Maybe there is some truth to that? [1]: http://www.keil.com/support/man/docs/c51/c51_le_regbankspec.htm http://www.keil.com/support/man/docs/c51/c51_le_regbankspec.... [2]: https://fosdem.org/2020/schedule/event/generation_gaps/ https://fosdem.org/2020/schedule/event/generation_gaps/