tek4006 A little demonstration of a tektronix 4006-1 storage tube vector graphics terminal. The terminal keyboard is TTY code only, that is the lower half of ASCII. It has a swedish prom (iso-10646-se) so \ is renderered as ÄÅÖ. It does accept lowercase input but displays it as uppercase. for graphics it uses 7 bit bytes, with the option of checking or ignoring parity in the 8th bit.