That is weird, two 8275s but only one is connected to the chargen. The way it's wired up does suggest that the second handles char attributes. Strangely though, the data fed by the dmac is the same to both except the topmost bit of the second crtc. That's not quite right, although the second crtc doesn't connect the drq output and the data lines (other than bit 7) are the same, the WR line is different when dack is active.
Last edited by crazyc; 03/10/18 08:18 PM.