Keith was one of the original xterm authors and part of the original Project Athena at MIT & DEC. Sadly, what I recall seems to be correct for an open source version of SIXEL. From: Keith Packard Date: Monday, March 4, 2013 4:55 PM To: Clement Cole Subject: Re: Pulling Old Bits from the memory cache "Cole, Clement T" writes: Hey Keith, One of the computer history mailing lists I monitor popped up a question you might know the answer too. Going back to your Athena days, do you know if anyone ever either open sourced DECterm, and/or put SIXEL/Regis support into something like xterm? To my knowledge, xterm never did SIXEL (it did support Tek 4010 / plot 10). I've never seen the sources of DECterm, but fwiw, the VT100 emulator in xterm came from the DEC team who did the 'real' VT100 and, as I recall, came from a validated VT100 simulator, making it the best VT100 emulation of its era. xterm certainly never did sixel or regis support before leaving the X consortium and Thomas Dickey never added it to my knowledge. Knowing a bit about the internals of xterm, adding sixel support would be a fairly major restructuring of the code. -keith