Oh... That's just the start of the trickery. DEC and HP (and the Apple II, in high-res mode) had tricks to shift (delay, really) groups of pixels by half a pixel, giving us better A's and V's, and more rounded O's.
Some of those block diagrams were a bit oversimplified. One cannot address 9 rows with only 3 address lines, for example. Or do block graphics with just 4 NOR gates.