[Coco] calling all MM/1 owners
Kevin Diggs
kevdig at hypersurf.com
Fri Jan 25 15:18:27 EST 2008
Gene Heskett wrote:
>
> Look at the data line, powered up, with a voltmeter, and do whatever it takes
> to get any resting line above 2.8 volts. 3 is ideal, but by the time you've
> lost .65 volts in the isolation diode between the 5 volt line and the top of
> the resistor packs, 3 can't be done. This isolation diode can be shorted
> out, which will help considerably IF you can guarantee that there will never
> be a self powered drive cabinet attached to the external scsi connector on
> the back of the card if it has one. Its there to keep an external supply
Gene,
Could you replace the diode with a Schottky version? Don't they have a
lower voltage drop?
kevin
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