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C51 4 Bits Electronic Clock kit
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ledtester:

I came across an Arduino based programmer for the 2051:

https://github.com/piotrb5e3/AT89C2051_programmer

Also, the attiny2313/4313 is pin-compatible with the 2051, so you could replace it with an AVR-based mcu.

aldolo:
Hi Edy. I've found posts stating that the shipped chip was not programmed at all. Unfortunatly the chip is usually the "parallel" and not the "serial" version so the programmer is a little bit costly. i'm checking the ledtester link. it could be a nice pasttime. what a pity that this clock are not sold at 1$ anymore.
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