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I have two quick things. The discussion of the microprocessors interested me long ago. I was going to buy the Chem-1 that had the 6502 and then Poplar Electronics came along with, I think, a three-part article over three months about the Cosmak ELF using the 1802 microprocessor. And I looked at that more and it says CMOS. Apparently a lot of satellites in orbit were using it because it was radiation-heartened and wouldn't have as many errors as other microprocessors. So I built one of the Cosmak ELFs and loved it and wrote a lot of software with it. In fact, it had eight switches for the binary numbers. I'll drop it in a second.