I think what really makes me appreciate building a startup today compared to the 80's is the low cost of entry.

They had to travel to editors of magazines to demo software, fax documents, manage a toll free number and of course, distribute on physical disks.

Growth hacking in the 80s without the web and mobile was a very different landscape.

My favourite fact - it took 185 person-months to develop PowerPoint for Windows at a cost of $500,000 :)