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... ------------------------- Website: http://blog.smartphonefanatics.com Instagram:   / alangrassia   Mastodon: https://noc.social/@AlanGrassia Bluesky: https://bsky.app/profile/alangrassia.... LinkedIn:   / alangrassia   ------------------------- Into Music: Moonz Author / Artist: tubebackr Website:   / tubebackr   Licensing info: https://tubebackrmusic.wixsite.com/tu... Christmas Music: Lofi Xmas Sludge - Deck The Halls Author / Artist: John Bartmann https://johnbartmann.com Licensing info: https://johnbartmann.bandcamp.com/alb...