Invisible wrote:

> However, I just found the following pages:
> 
> http://www.kpsec.freeuk.com/components/ic.htm#logic
> http://www.kpsec.freeuk.com/components/74series.htm
> http://www.kpsec.freeuk.com/components/cmos.htm
> 
> Suddenly everything seems so much clearer.

If you search around the Internet for long enough, you can find some 
really useful stuff. For example:

http://www.play-hookey.com/digital/jk_nand_flip-flop.html

This is significantly simpler than I had imagined! ;-)

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