undefined | Better HN

0 pointsbink4y ago0 comments

All this talk of IRQs and DIP switches and no one has mentioned N81 or E71. There was a time when you had to pay attention to the parity before dialing. Also, it looks like 8N1 and 7E1 have become the more common notation now.

0 comments

3 comments · 2 top-level

timbit424y ago· 1 in thread

Having lived through the modem era and having run a BBS, I've never seen N81 or E71 before. You must have been running a particular piece of software that made up it's own nomenclature.

EvanAnderson4y ago

The grandparent is talking about parity, data bits, and stop bits[0]. Different serial communications protocols had different framing needs. If you were dealing with PC-based BBS's, for the most part, you wouldn't have run into anything aside from N81. I didn't see much E71 outside of X.25 networks.

[0] https://www3.nd.edu/~lemmon/courses/ee224/web-manual/web-man...

StanislavPetrov4y ago

Also haven't heard anyone mention that early manual terms required using "ATDT" to dial with a touch tone phone because the default dialing method was rotary back then and there was no GUI.

j / k navigate · click thread line to collapse