Since I have a working SD Card I decided it was time to start trying to get CP/M to work on my computer. I've written a BIOS which seems to work fine when I test the individual calls, but when I combine it with the rest of CP/M something goes wrong. I put a debugging call in which rings the bell when it gets to a certain place, which caused something to nearly work — I got an A> prompt, at least! But then it doesn't respond properly to commands I enter. I'll just have to keep on debugging.