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hap
(Sorry, English)
I guess it's no problem to post in English here.
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I don't think the sensorboard device emulation is that slow.
Yes, that's what I already said - it's not the fault of the sensorboard, but only of the emulation of this special ESB6000 board or interface.
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However, the Mephisto III connects the chessboard to the 1802 EF1 pin. On emulation, this pin is polled at every opcode. So at 100MHz, it will check the chessboard sensors around 500,000 times per second.
OMG, that explains the reduction of emulation speed from 100% to 40% of course!
Couldn't this polling be reduced to a lower rate, e.g. only every 10th opcode?