Chapter 2: Installation
2-21
AGP Slot
The AGP Pro slot is backward compatible with AGP Pro and 4xAGP
graphics cards, which have fewer pins than AGP Pro cards. Because of
this, care must be taken when installing a graphics card into this slot, as
doing so incorrectly can damage your motherboard. For AGP Pro cards,
you should remove the orange sticker covering one end of the slot. For
other cards, leave this sticker in place and make sure your card does not
plug into the section it covers. A general rule of thumb is to make sure
your card fills the section of pins nearer the center of the motherboard first,
then the end toward the edge of the motherboard if there are more pins not
seated. If the I/O shield of your card is flush with the edge of the mother-
board, the card should be inserted correctly.
50-pin Legacy SCSI
Connector Ultra Wide
SCSI Connector (P4DC6/
P4DC6+/P4DC6+II only)
Refer to Table 2-37 for pin defini-
tions for the 50-pin Legacy SCSI
connector located at JA3.
Pin Number Function
1 GND
2 GND
3 GND
4 GND
5 GND
6 GND
7 GND
8 GND
9 GND
10 GND
11 GND
12 Reserved
13 Open
14 Reserved
15 GND
16 GND
17 GND
18 GND
19 GND
20 GND
21 GND
22 GND
23 GND
24 GND
25 GND
Table 2-37
50-pin Legacy SCSI Connector Pin Definitions
(JA3)
Pin Number Function
26 -DB (0)
27 -DB (1)
28 -DB (2)
29 -DB (3)
30 -DB (4)
31 -DB (5)
32 -DB (6)
33 -DB (7)
34 -DB (P)
35 GND
36 GND
37 Reserved
38 Termpwr
39 Reserved
40 GND
41 -ATN
42 GND
43 -BSY
44 -ACK
45 -RST
46 -MSG
47 -SEL
48 -C/D
49 -REQ
50 -I/O
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