Got my R909 delivered today and got all my miners going except the R808 I got off of ebay appears to have pooped out. It was working then got stuck on Found 0 Chips..
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Check it's not a software version issue - i.e. if it was working before, use the version of software from before just for the R808 and see if it's ok.
I've no idea if the R808 works with the current code.
I've run R909, R606, CompacF, NewPac, 2Pac and Compac on the new version (and you should use the new 4.12.1 version for those six)
As I mentioned in Discord, this turns out to be that the old magic '60' calc is no good for the R808.
Side effect was an average of about once per half an hour of it deciding to reset due to a slow nonce.
I've updated git with a fix for the R808 (and I've run it on all the miners now together) and the new calc is more reasonable (and more accurate)
So only if you have an old R808 you should do the update steps in
https://kano.is/gekko.php#lin and it should fix that.