Cracking Open the IBM PC Jr.

Expansion slot layout

There are four pieces of equipment highlighted (red arrows):
  1. The floppy disk controller
  2. The infrared reader for the keyboard
  3. The RAM expansion (64KB)
  4. The power supply controller 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.

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