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40 cm cable is most likly very much too long. you need a buffered IDE cable for this.
technically,. the IDE is connected directly to the CPLDs, they are using 3.3V signalling while IDE is technically 5V. but as everything above 2.4V is a high signal. (think it is 2.4) it works. with a SHORT cable. but with too long. the voltage drops too much.
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