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).