i remember the first flight simulator we had, too on DOS.. i still know how to use dos, most people see me on it and are like 'wtf?' when i used to do it at school (games when i was bored / finished all my work when were were in lab)
It was around before that, but not in it'* current form. I was selling access to FidoNet back in the mid 80s. If memory serves, ArpNet was the network that became Internet. I had also sold access to WWIVnet, And a few others, but I dont remember anymore. So many networks, only one made it.
I connected to different BBS with my Amiga before the PC became decent. I used a 14,400 USR Courier HST modem which was a popular high speed standard back then. I still have that old modem in the garage.