id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
351	Emacs crashes with video invoked when requested Emacs line length exceeds Multics video line length.	Jeffrey H. Johnson <trnsz@…>	Eric Swenson	"1. `stty -ttp vt102`
2. `wdc invoke`
3. `emacs -ll 104 >udd>Ring0>JJohnson>speed>instr_speed.pl1`
4. Hold down Control-N (scrollng down line by line).

Once it scrolls to the line containing the ^L character, Emacs will crash:

{{{
Error:  emacs error by e_pl1_$signal_io_error|14573
(>system_library_unbundled>bound_multics_emacs_)
The request was not within the boundaries of the requesting window. Emacs encou
\cntered an error. Error from window_$<<video system ctl>>.
Give the following command:
file_output emacs_trace_;trace_stack;revert_output
and save the results for programming staff.
}}}

This happens when using Multics video system with a terminal of 80 width, but (likely erroneously) specifying that Emacs should use a width of 104.

I encountered this because I had (unintentionally) set an abbrev for emacs which was invoking it with -ll 104, and I was using the 80x25 vt102 terminal.

This is a very abnormal configuration for me, since I normally use a 132x50 terminal.

Rather than crash, if this is truly a fatal configuration error, Emacs should instead just complain that the requested line length exceeds maximum width width of the currently invoked Multics video session."	defect	assigned	major		General	MR12.8