My Facebook friend Ron Nelson recently sent me this photo of himself at the 1980 World Computer Championships in Linz, Austria.
The Chess Challenger is stacked onto a Peltier refrigerator to cool it down.

Schaut schon ein wenig komisch aus diese fidelity waffel.

Strange that he participated with 4 mhz 6502 in 1980.
For 1980 4 mhz was a strong machine.
On the other hand :
All ron nelson fidelitys were z80a etc.
The sprackens used 6502.

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Die ganze Welt des Computerschachs