Hey Birt!'s video: C128 VIC Tower Mystery: Solved The mystery of the C128 VIC Tower mod board

In this video we take an in depth look at the ‘VIC Tower’ mod board we found a few weeks ago in a dead C128. It was not causing the black screen problem, but its purpose was a mystery. At that time, we found out that it was indeed a Commodore factory mod and that it altered the /RAS timing but for what purpose it was not clear. Before sending the repaired C128 back to its owner a logic analyzer was used to record signals going to the RAM chips, including the original and VIC Tower modified /RAS signal. After a good deal of digging I think we finally solved the mystery of what the little mod board was for. For good measure we compare the data to another C128 which did not come with the mod board so we can try to rule a change to the VIC chip out. Please consider clicking on the Subscribe button below and then click the bell icon. That way you will be notified when I post a new video. Thanks! Help support Hey Birt! https://www.subscribestar.com/hey-birt https://www.patreon.com/heybirt Hey Birt! On Social Media! Facebook: Soigeneris: https://www.facebook.com/Soigeneris-295527583797729/ Hey Birt!: https://www.facebook.com/HeyBirt/ Twitter: Hey Birt!: https://twitter.com/HeyBirt?lang=en Credits Chiptune Thing No. 3 "Victory" by Steven O’Brien https://soundcloud.com/stevenobrien Creative Commons — Attribution 3.0 Unported— CC BY 3.0 http://creativecommons.org/licenses/b... Music provided by Music for Creators https://youtu.be/ujIMRIJ1JG8