In article , geos wrote:

hello,

after some summer break I come back to the idea of modding my old p2b-d.
I reviewed the document here http://tipperlinne.com/p2b-ds150.htm and
want to make myself sure wheater the connections between pins are as
follows:

http://www.geocities.com/qroobas/ds-before.jpg

I would use 2-pin FS3 instead of 3-pin if the third pin, the rightmost
one, is unused. I would appreciate confirmation of these connections by
the author or Paul or somebody, who has done such modification.

thanks,
geos

This is my previous post:

http://groups.google.com/groups?selm...0192.168.1.177

This is a schematic diagram of the wiring.

+3.3V
+3.3V ---X |
10K |
X----/\/\/\---+ \ (Internal
"strap" | / 240K
GND ---X | \ Pullup
------------- | / Resistor)
| | |
| | | 22 ohm
PCICLK0 |----+--+--/\/\/\--------- Clock to PCI slot
| Series
| Damping
------------- Resistor ("R99")

Now, we redraw it physically:

+-------------------------------------
| |
| |
10K ----------- | New
Resistor | | X X X FS3
| | 9250 | | |
------R99---+-------Pin9| Clock | | |
22ohm PCICLK0| Gen | +----+ |
| | | +----+
----------- | |
X X X FS0
X X X FS1
X X X FS2
(+3.3) (GND)

All three pins of the new header are used. The end pins of FS3
are feeding from the end pins of FS0. All the left hand side
FS pins are at 3.3V, and the right hand ones are at GND potential.
The long wire goes from the center pin of FS3, to the end of the
new 10K ohm resistor. The other end of the 10K ohm resistor is
soldered to the junction of R99 (where the right hand side of
R99 is soldered to its pad). This keeps the bottom end of the
10K resistor close to the circuit, keeping the stub length down.
The wire going from the top of the 10K resistor isn't critical, so it
doesn't have to be strung like a guitar string. Neither are the
two wires running from the left and right header pins of FS3,
when they connect to the left and right header pins on FS0.

The photograph from Tipperlinne is deceptive and the photo should
have been taken before the hot glue was added, or at least the
solder joints should have been visible.

HTH,
Paul