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Tesla Challenge 16: Echo Generator

Subject: Cool Dad yet again!
From: Joe (周海涛) <joe@longteng-co-ltd.gd.cn>

We got into another agreement with the international star of all time, COOL DAD! This time he wants us to create a bunch of microphones that generate artificial echo. Shouldn't be too hard, we'll just need a delay algorithm.

Subject: Re: Cool Dad yet again!
From: Carl Tesky <carl@longteng-co-ltd.gd.cn>

Not that loser again! Sorry, I'm not working on it. I can't stand him!

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Small hint: You must write values into a RAM whether or not the microphone is on.

Big hint: It might prove extremely useful to hook up the d0 pin of a RAM to the 'writer' microcontroller, and all remaining pins (a0, d1, a1) to the 'reader' microcontroller.

Optimization tip: Unfortunately division by 2 requires at least two microcontrollers.