John Foust wrote: I started this for the VT320, many years ago. I wrote an emulator for the 8051 and started running the VT320's ROM. It was fascinating, having to learn about I2C and trying to pass the terminal's self tests! I had to put a VT320 on a bench and prod it with an oscilloscope to determine the video timing because I was determined not to NOP out bits of the code that didn't run successfully. Unfortunately, I was clumsy and broke the tube while doing it -- the first and last time I've had to dive under a bench when hearing the rattling of a re-filling CRT! There's probably a (er, another) post in the archives from me on this embarrassing subject. I have two VT52s in need of some TLC and new owners if someone in the UK fancies a project and can collect them from Crawley, W. Sussex. Personal "challenges" prevent me from doing any classic computing for the forseeable future. As far as accurate emulation of the VT100 and up goes -- I supplied some patches to xterm a while back to improve its coverage of error cases, based on the detailed state machine documented at my site, but I think most of the patches have been reverted since, because many other programs rely on errors in the original emulation. Ho hum. I would love to know why any of DEC's VT100-and-up terminals wouldn't have decent VT52 emulation -- I've never encountered any flaws other than those in the VT420. -- Paul