Actually, the 6883 SAM (synchronous address multiplexer) is the DRAM controller and the 6847 VDG (video display generator) is the one that has the various video

Actually, the 6883 SAM (synchronous address multiplexer) is the DRAM controller and the 6847 VDG (video display generator) is the one that has the various video modes. See the character set implemented by the internal ROM in figure 20 of https://people.ece.cornell.edu/land/courses/ece4760/ideas/mc6847.pdf https://people.ece.cornell.edu/land/courses/ece4760/ideas/mc...