guy@ucbvax.Berkeley.EDU (10/28/85)
From: sun!guy@ucbvax.Berkeley.EDU (Guy Harris) > >We have discovered that accidentally doing a "tset vt100" from > >our SUN consoles screws up their scrolling (and vi, and more, and....) > >The problem is due to the initialization string sent to the > >console (ESC[1;24r).... > > In the list of commands that the SUN terminal emulator groks is a note > that the sequence <ESC[s> will reset the terminal to a sort of virgin > state. Especially useful is that it undoes the set-scrolling-area > limit of 24 lines that your vt-100 tset did. The SUN console/terminal emulator don't interpret <ESC>[N;Mr as a VT100-style "set scrolling region" command - that escape sequence is in the series reserved by X3.64 for private escape sequences, and "set scrolling region" is DEC-private. The escape sequences are documented in the Sun UNIX 2.0 manual page CONS(4S), where it also says The Sun terminal emulator and the VT100 are *not* compatible in any true sense. (Italics in the original). <ESC>[Nr is "set scrolling" (SUNSCRL), which takes one parameter, default 0. It "sets to N an internal register which determines how many lines the screen scrolls up when a line-feed function is performed with the cursor on the bottom line". An N of 1 is the normal mode; N of the screen size causes the screen to clear instead of scrolling; N of some small value >1 causes the screen to jump a bit when scrolling. N of 0 causes the console, but not the SunWindows terminal emulator, to move the cursor to the top line without scrolling; the top line is cleared, but the screen is otherwise unchanged. Guy Harris