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I keep getting "Invalid Format, reformat SD." errors. I've tried two different SD cards and yes they're formated to FAT16. I tried a few other sample SD card sketches and they see the SD card just fine.
Not a well suited inverter since it looks like a pulse driven square wave.
Looks like a 555 timer going into a 4013 D-type Flip-Flop.
Kinda late but I found what you were seeking since I was also seeking out this part. The chip I got came out of a Sharp Printer Calculator.It's a Mitsubishi 7480/7481 micro computer. Here is the datasheet.http://pdf1.alldatasheet.com/datasheet-pdf/view/784/MITSUBISHI/M37481M8T-154SP.html
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