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The 6845 '''CRTC''' (Cathode Ray Tube Controller) chip was created by Motorola in 1977. It works with the [[Gate Array]] to generate the video signal on the Amstrad CPC. This chip is also used in the [[BBC Micro]], [[Sharp X1]], [[MicroBee]], [[Commodore PET]] and the early graphics cards (MDA, Hercules, CGA, Plantronics Colorplus) for [[IBM PC]]. It is also found in some [https://www.msx.org/wiki/Hitachi_HD6845 MSX1 expansions], adding an 80-column text mode.