Faaaa. So many hours spent coding to this (an osi transport stack classes 1 to 3, 4 was too hard, in pl/1 on a vax) and configuring switches.<p>Pad calls were fun. I crashed a vax showing break-back in Janet pad calls on the console<p>Does anyone else remember the story about banks coding to call reject using the buffer in a failed connection to complete an atm cash transaction? Hence the invention of the minicall.<p>Variable length addresses. Such pain. X.75 as well..