COSMAC ELF website
I got my start with real computers by purchasing a computer kit called an ELF II from a classmate when I was in grade 10. The CPU used in it was an 8-bit single chip uProcessor called an 1802. The chip was very innexpensive for the time (1976 - 1982) and was detailed in most electronics magazines with various hobby computer construction articles. The Cosmac ELF website is probably the best collection of 1802 realted information and contains an active discussion list of topics related to the infamous 1802 chip.
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