Jon Elson wrote: > ed wrote: > >>> What version of PPMC motherboard do you have? Does it have a little >>> SIP resistor pack plugged into sockets at RP1, at the end opposite to >>> the power and DB-25 connector? If it doesn't, then does it have an >>> array of individual resistors at P3? If neither of these, then I >>> can easily understand the problems you are having. The original >>> PPMC was designed to work with the old, slow, 5 V parallel >>> ports on the computers of the day, (note your PPMC boards were >>> purchased in early 2007) and won't work reliably on newer >>> computers with faster, 3.3 V parallel ports. >>> >>> I had to add a bunch of terminating resistors and make some other >>> adjustments on the motherboard to improve reliability for the newer >>> ports. >>> >>> Jon >>> >>> >>> >>> >> Does this apply to the UPC cards? >> >> >> > Sort of, yes. I had to add these same terminating resistors and a few other > similar changes to the UPC and USC boards to combat crosstalk issues > on the EPP cable. It can be added to older boards that don't have it. > let me know what version board you have, and I can be more specific. > Oh, I should add this discussion is about some REALLY old boards. Bruce Klawiter's PPMC board set was made in 2007. These improvements were added to the UPC/USC boards by hand about 2008 or so, and by traces on the boards by 2009 or so.
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