Cracking Open the IBM PC Jr.

Video chip

The IBM PC Jr. does not have what we would consider a dedicated GPU. Instead it has the Motorola CRT controller marked in yellow.

Marked with a red arrow below that is a technical name Asynchronous Communication Interface Adapter. To me, that means modem - this chip would help process incoming information from an external modem.

Just to the right of the CRT controller is a chip, upside down in this photo, with the number SN76496N. That is the Texas Instrument sound chip.


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.