Appearance
VT220
Features from the DEC VT220 terminal (1983), which added insert/delete character operations (ICH, DCH), 8-bit control codes, user-defined keys, and national replacement character sets. The VT220's editing sequences (ICH, DCH, IL, DL) are fundamental to full-screen terminal applications — they allow inserting and deleting characters and lines without redrawing the entire screen. Modern terminals universally support VT220 editing operations.