>The Apple 2 series had a very similar button
>sequence (open-apple, control, reset), which actually
>did soft reboot the machine without confirmation.
Those were the later ones.
Initially there was a reset button that dropped you to the monitor. There was a well-known mod to require another key.
Eventually, the control key was required; I forget when that started (the //e? I don't think it was the plus, but it's, ahh, been a while)
You could get back into BASIC with esc-b or some such.
Compucolor had a "CPU reset" button on the keyboard. I knew someone whose cat walked up his arm, curled around his neck to snooze for half an hour, and walked down the other arm, stepping on the key . . . he didn't know that there was a similar sequence, and lost something like an hour's work.
For that matter, until the IBM PC, almost everything had *something* you could just push to restart; IBM got a lot of flack over this.