The 90’s were even more lead-addled than that. You remember these things:
Barrel jacks and plugs. Typically used for DC power, and that’s all I can reliably say. The socket had an inner pin and and outer ring that engaged with the inner and outer surfaces of the plug. Which was positive and which was negative? BOTH! A given power brick or device could be wired either way, which is why most of them had one of these diagrams printed on them somewhere:
There was no attempt at standardizing sizes or lengths for different polarities or voltages. It was entirely possible you could own a 12V center positive power brick that would plug straight into a 6V center negative device. If you were lucky, the device had reverse current protection, maybe a self-resetting fuse. Some didn’t. Or, somehow worse, you’d find a brick with the right voltage and polarity that wouldn’t physically fit.
So the current state of USB-C charging is considerably less lead-brained than what I grew up with.
The barrel pin system could have been great if it was standardized. Only one valid polarity with barrel size being keyed to voltage while pin size was keyed to amperage, for example. A plug would only fit if it was the correct specs, and would always fit if it was the correct specs. Unfortunately, nobody ever had this idea while they were popular and it’s much too late now.
The 90’s were even more lead-addled than that. You remember these things:
Barrel jacks and plugs. Typically used for DC power, and that’s all I can reliably say. The socket had an inner pin and and outer ring that engaged with the inner and outer surfaces of the plug. Which was positive and which was negative? BOTH! A given power brick or device could be wired either way, which is why most of them had one of these diagrams printed on them somewhere:
There was no attempt at standardizing sizes or lengths for different polarities or voltages. It was entirely possible you could own a 12V center positive power brick that would plug straight into a 6V center negative device. If you were lucky, the device had reverse current protection, maybe a self-resetting fuse. Some didn’t. Or, somehow worse, you’d find a brick with the right voltage and polarity that wouldn’t physically fit.
So the current state of USB-C charging is considerably less lead-brained than what I grew up with.
The barrel pin system could have been great if it was standardized. Only one valid polarity with barrel size being keyed to voltage while pin size was keyed to amperage, for example. A plug would only fit if it was the correct specs, and would always fit if it was the correct specs. Unfortunately, nobody ever had this idea while they were popular and it’s much too late now.