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Comment by nisse72 | Hacker News Reader

And packet collisions are not unusual. But then you simply wait a short time, and try again.

    10 Drive forwards a bit
    20 Stop
    30 Did we hit something?
    35 YES: Sleep for a short time
    40 GOTO 10

Reminds me of the development of Diablo. Once that sleep time became small enough the game took off.