I don't remember the VT52 board, but you may well be right. The obvious advantage of single sided boards is that it avoids plated through holes. I once did a two-sided board without plated through holes (at the U of Illinois -- the board shop didn't know how) but that wasn't reasonable technology for serious work because you have to solder both sides then. The VT61/t stood out to me because it has so much stuff in it. I forgot how many boards, but it was way more than the VT52 (which has just one, I think). No surprise, the VT61/t has local editing / forms processing capability with block mode transmission both ways. In one Typeset-11 application you'd edit a screen full of text locally and send it back when done; in the other you'd fill in a classified ad order form and send that. The VT71 also had local text editing but there it's a whole file, with local scrolling and search, line wrap, and macros ("User Defined Keys", UDK, tied to a row of blank keycaps that the customer would label). paul