Thank you! Your 5/115/6 -Solution was quite obvious ;-)

you helped me find the error - it was a typo - i wrote 'slp x0'

I checked my solution again and it worked, so I'll put it up in the description for you. Hope it works this time!

well i know that and I did that. my problem starts after i received and sent the first packet - how to advance to the next packet ? in riddles where on silent ticks no packet is sent, they often send -999 as dummy - if not then usually i can wait for the next packet with 'SLX X0' - but for some reason that does not work here - in fact I even wonder how you did it yourself
. . .

I might know what's wrong, and it's pretty obvious when you see it, but did you notice that the 3 data values arrive at once? For XBus, multiple values can be inputted on one time unit, which is indicated by the little arrow. This applies to both dataIn and dataOut in this scenario, which simply means that you have to receive 3 numbers and output 3 numbers as well (just in reversed order). Hope that helps!

i don't know how to advance to the next input after processing the first packet - it always hangs.

if I use 'SLP X0' - I get 'Part not sleeping' there.

If I use
. SLP 1
. MOV X0 ACC
I get 'Part not sleeping' on the 'MOV Line