Quoted from GRUMPY:The 7447 chip is a BCD to seven segment driver chip. BCD is the way computers can count with just highs and lows. The 7447 chip converts the 4 BCD inputs to the seven segment outputs.
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I found a video on YT of this chip being demonstrated with a 7-segment display with a computer program. I found it interesting. The video showed that you can actually get outputs higher than 9 with these “c” shaped patterns. That’s exactly what I was getting before the display died completely. I don’t know if it was trying to show me a 10, or a 12, or what, but it now seems to be a legit output instead of random characters. Now that the display isn’t showing anything, I’m wondering if the 7447 is bad, and the “c” was it on the way out, or if something even further upstream from that is bad.
Here is the video. If you go to 6:24 he scrolls down to a second chart and backwards "c" is supposed to represent an 11. My MPU has been Spinal Tapped.