On 2016-05-29 19:43, Phil Budne wrote: Yes, I know about it. I actually did sortof an Emacs clone in TECO-8 many years ago. It's actually pretty easy to do a decent implementation in TECO. The problem is that you cannot really edit large files. TECO-8 and TECO-11 can edit arbitrarily large files, but only as a stream. You read in a page of the file (where a "page" is a bit loosely defined), you edit it, and then you pass it on to the output, and read in the next page. At that point, you cannot go back to a previous page anymore. And all editing is happening within the buffer that you have in memory. So all addressing is done local to the page you have in memory. So, while cool, and somewhat fun, it have some rather severe limitations if you want to edit large files. And this is a TECO-11 limitation, and cannot really be solved in a good way by any code written inside TECO-11. What I did for my implementation for TECO-8 was that I keep a count of which page I was on, and if I wanted to go backwards, I had to close the file, reopen it, and read from the beginning until I was at the previous page, and then work from there. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol