static VIDEO_UPDATE( ti990_10 ) { vdt911_refresh(bitmap, 0, 0, 0); }
UINT32 ti990_4_state::screen_update_ti990_4(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { vdt911_refresh(m_terminal, bitmap, cliprect, 0, 0); return 0; }