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Simple alarm system

Simple alarm system

I am receiving lots of letters about car alarm system based on PIC 12C508 Version 1.0 (link broken). The system described was introduced as a simple circuit only.
I tried to focus on using one and the same pin as input and output in different situations. Parts of code were taken from my previous alarm projects (AS1 and AS2), which were a success. The code wasn’t totally debugged and I have no time to revise it now. Instead, I’m introducing a new Version 1.1.

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