Hardware

Cracking Open the IBM PC Jr.

Side panel expansion

One of the interesting and unique features of the PC Jr. was the side panel expansion system.

Here we are looking at the expansion panel for a parallel printer port. My personal PC Jr., all those years ago, had a 128KB RAM expansion board. (That's right, a whopping 256KB of RAM total)

About

Mark W. Kaelin has been writing and editing stories about the IT industry, gadgets, finance, accounting, and tech-life for more than 25 years. Most recently, he has been a regular contributor to BreakingModern.com, aNewDomain.net, and TechRepublic.