Cracking Open the IBM PC Jr.

Floppy disk removed, motherboard revealed

Oddly enough, that huge floppy drive is not bolted to the motherboard and it lifts right out revealing the entire motherboard underneath.
  • The red arrows mark the cartridge slots
  • The yellow highlight is the CPU
  • The blue arrows mark where the expansion modules connected
  • The green highlight marks the primary RAM memory bank

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