The History Source on Instagram: "Would you consider a 50 lb/22 kg computer as portable? Well in the mid 70s they did. Released in 1975, The IBM 5100 is one of the first mass market portable computers in history. The base model with 1.9 mhz of processing power and 16kb of ram had a starting price of $9,000 which adjusted for inflation is about the equivalent of about $50,000 today. Luckily by the 80s, the computers slimmed down enough to have lighter, slimmer devices and laptops were also a majo