3 ms·It's for CRT Controller (probably after the Motorola 6845 CRTC chip that was in the original PC)by grapeshot 11y agoIt's for CRT Controller (probably after the Motorola 6845 CRTC chip that was in the original PC)gpvos 11y agoWell, maybe the documentation for the function could have mentioned that. Oh no, there was none.wnoise 11y agoAnd CRT is short for Cathode Ray Tube.