Cracking Open the IBM PC Jr.

More memory

The yellow box shows all of the primary RAM chips from Mostek. The red arrows show where the infrared module connects to the mother board.

About Mark Kaelin

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.

Free Newsletters, In your Inbox