[BREAKING NEWS] Exclusive leaked photo of 2 CIA members!

#MOS6526 #CIA #MOSTechnology #ComplexInterfaceAdapter #IntegratedCircuit #IC #Commodore #CBM #C64 #Chipset #8bit #retrogaming #retrocomputer #videogames #80s #90s #Geek

New video! I finally managed to fix a C64 board that my late friend ZXkim81 gave me in 2017.

YouTube: https://youtu.be/FcpRs62eg2I
PeerTube: https://makertube.net/w/nNM4RFWSE4xjH4khP2vJrm

#Commodore #C64 #Commodore64 #Repair #Troubleshooting #RetroComputing #VintageComputing #MOS6526

OK, I finally narrowed down what is happening, but WTAF? 🤔​

I have been using a BIT $DD0D all the time, to 1) acknowledge the NMI and 2) check if the NMI was actually triggered by the CIA (to differentiate it from the RESTORE key), in which case bit 7 is supposed to be set.

This has stopped working. If I NOP out the ICR check, the server synchronizes with the Arduino again and everything works.

Have I killed the CIA so subtly that everything is working except it setting the IR bit or am I overlooking something else? ​

#C64 #MOS6502 #MOS6526 #RetroComputing