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Old 15 September 2014, 08:45   #2
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 36
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The clock port is memory mapped io, you need address decoding and a chip that provides you a register you can write to in order to be able to use it as GPIO.

If you want a pre-provided TTL GPIO port, use the printer port, like everyone on every computer did in the 80s/90s.

8-bit C= users used the user port for the same purpose.
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