Ah - that makes sense, and since VT-100 are not fully ANSI, that's likely why it's not listed in my circa 1976 VT-100 programmers manual and probably why it does not work for Jacob. ;-)
The sequence ESC-c is ANSI X3.64 for "reset to initial state" which
happens to clear the screen, among other things. I still use it
frequently to reset Mac OS X "Terminal" windows to a sane state,
manually entered.