Certainly a carb is old tech.
It's just that the sensors tend to degrade over time and a lot of external connections to maintain. The computerized system has more opportunities for degradation as it ages.
Depending on how well used the starting truck is, there could be a significant amount of troubleshooting to do in the near future. It makes it easier if you have the knowledge not just to read codes but also to troubleshoot the sensors themselves.