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#1
July 15th 19, 06:39 PM
posted to alt.comp.hardware.pc-homebuilt
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66MHz PCI
Wikipedia says about conventional PCI:
The M66EN pin is an additional ground on 5 V PCI buses found in most PC motherboards. Cards and motherboards that do not support 66 MHz operation also ground this pin. If all participants support 66 MHz operation, a pull-up resistor on the motherboard raises this signal high and 66 MHz operation is enabled. OK. The pin is still connected to ground via coupling capacitors on each card to preserve its AC shielding function. I don't understand that part. Anyone? 
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