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ITS and Imlac
Some ITS machines had Imlac PDS-1 machines attached. Primarily the Dynamic Modeling PDP-10, were the MAZE game was developed into a fast paced multiuser game. The Mathlab PDP-10 also had a few Imlacs, probably used mostly for Macsyma.
The DM Imlacs ran older software called SSV, or screen saver. MAZE probably assumes some particular versions of SSV, which we may not have now. The preferred text editor with SSV is IMEDIT. The ITS terminal type for SSV is %TVIML. There is a newer software called SST which is much better for full screen editors like TECO or EMACS. This terminal type is %TNSFW, but it really is safe for work.
Josh Dersch has written an Imlac PDS-1 emulator, which can attach to a PDP-10 emulator serial line.
