On Fri, Oct 13, 2017, at 22:59, Will Senn wrote: First, you'd need to remove it as the *interrupt* character, which I don't think the stty command in V7 can do, though the kernel supports it with TIOCSETC. Signal characters are processed before input control ones. #include <sgtty.h> struct sgttyb buf; main() { ioctl(1, TIOCSETC, "\3\34\21\23\4\377"); gtty(1, &buf); buf.sg_erase = 0177; buf.sg_kill = 025; stty(1, &buf); } Also, it won't actually erase the character (unless your terminal interprets an echoed ^? that way - to my knowledge only putty does) - the crterase flag [and feature], which echoes space-backspace-space on erase was added later than V7. IIRC, it doesn't have effect on the first character of the line, which is enough for C. Looking through the TTY driver, it looks like there's code for backslash to escape it. You could probably put something together with stty raw, od, and sed q (head didn't exist in v7, and you need *something* to cut things off because ctrl-d won't work with stty raw), but it may be easier to figure out what all your keys produce outside of your classic unix environment.

On Sat, Oct 14, 2017, at 01:03, Will Senn wrote: Well the obvious next step is to patch the kernel to do the backing up and erasing. I implemented this for myself once, but I've lost the code since then. I *think* the right place is in tty.c, around line 489 (that's where it currently handles the special echo rule for the kill character, anyway). You'll just want to check for the erase character (and the same modes that are checked for the kill character) and echo backspace/space/backspace.