Douglas Quebbeman wrote: ... Yes, storage tube was the official word. I had what today may be considered the honor of using a 4014 several years ago. The graphics command language of the 40xx terminals did set a standard for generations to come, because it was effective (you packed chunks of four or six coordinate bits into bytes) and avoided trouble by making sure only printable characters were used (except for the DEL that could sometimes occur). Somewhat similar to what today's MIME standard does with Base64 encoding. You could even leave out (not send) certain bit groups if they hadn't changed. Very compact. 2400 baud was a perfectly reasonable speed for a graphics terminal, and you could go even faster... Unfortunately, I have only manuals left from that aera, and one or two terminals with a "Tek emulation" graphics mode. Even the VT240 could do that, but on that screen, it looked ugly, compared to it's native ReGIS. The only original Tek that I own is a far more modern 412x (haven't looked closely for a long time). -- Andreas Freiherr Vishay Semiconductor GmbH, Heilbronn, Germany http://www.vishay.com