SM 7238 aka T3300 -- yet another DECclone, likely not of a DEC original, but of something compatible -- this one is Intel MCS80-based, with no character generator chip. Technical manual is rather good, and mentions a graphics option with Tek 401x and ReGIS features.
Manual + schematics = working double-size chars and smooth scroll:
Cyrillic glyphs aren't very polished, though, compared with vt240-clone (mc7105).
When firmware thinks there is a graphics card, a Tek 4010 mode menu suddenly appears:
Graphic card is rather simple -- basically a "glass plotter" (no upd7220 there, it's all discrete chips).