A common arrangement (and not only for CP/M machines) would be a CRT controller managing its own memory where the program/OS would address the video memory through the microprocessor's IO channels. Many CP/M desktops used the "bus attached" terminal (because it saves components). You could add an S-100 video board with video output and keyboard input (usually something that would output ASCII) or you could attach a real terminal over a serial line on an S-100 board (which is kind of nice if you want to be far from the computer but not that useful for a desktop). Altairs and IMSAIs didn't have standard terminals.
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