IBM 5150 Restoration Part 03 - Clock Signal Test

Merry #DOScember! As part of this year's holiday hijinks, I'm troubleshooting the OG DOS PC, an IBM 5150 Model B from 1985. In Part 3 of this video series, I test for the 4.77MHz clock signal on the 8284A clock generator chip (pin 8 @ U11), the 8088 CPU (pin 19 @ U3), and the 8288A bus controller (pin 2 @ U6). For extra fun, I break out the ultrasonic cleaner and proceed to turn the kitchen into a water park.

Videos In This series
Part 0 - Welcome home, IBM 5150 PC
   • IBM 5150 Unboxing and Review  

Part 01 - Testing the Power Supply
   • IBM 5150 Restoration Part 01 - PSU  

Part 02 - The Motherboard
   • IBM 5150 Restoration Part 02 - Motherboard  

Part 02 - Power On Follow Up
   • IBM 5150 Restoration Part 02 Follow Up - P...  

Part 03 - This Video

IBM 5150 Motherboard Chip Layout Diagram
https://upload.wikimedia.org/wikipedi...

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