Only if their modem didn’t implement the Hayes command set properly or you could otherwise control the per-character timing of the OS sending. It required a pause (1sec by default), “+++” with no pauses, another pause, _then_ the ATH command
I had an external USRobotics 56k modem, I was immune. But the many many "bulk" no-name modems were vulnerable. You could ping entire ranges of dial-up IPs and watch the results on big IRC channels. Uhmmm, allegedly :)
Does anyone know why it’s “code page 437”? Like why 437? Was there 437 code pages before it? Does the 437 bit pattern map to something in the hardware? Was it a character rom part number?
It originates from the code page 37, which is the EBCDIC-based character set for US and Canada. At least initially EBCDIC code pages are numbered sequentially while PC DOS code pages were numbered more or less randomly; I have no clue why it is the code page 437 and not 337. (I can see why it is not 137 nor 237, as later code pages were numbered from 251.)