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[News] Pictures of the MicroA1 "Industrial" motherboardANN.lu
Posted on 17-Oct-2004 12:25 GMT by Not ArticiaP69 comments
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On this link you will see three pictures of the MicroA1 "Industrial" motherboard: http://lain.ziaspace.com/~ryu/a1. On the pictures you can see that it still uses the ArticiaS northbridge, as well as the VIA 686B southbridge, but a standalone Sil0680 IDE controller is there as well.
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Comment 1Neil Thomas17-Oct-2004 11:25 GMT
Comment 2Adam Kowalczyk17-Oct-2004 12:15 GMT
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Pictures of the MicroA1 "Industrial" motherboard : Comment 15 of 69ANN.lu
Posted by Anonymous (66.120.210.29) on 17-Oct-2004 23:28 GMT
In reply to Comment 2 (Adam Kowalczyk):
I guess that you cannot use PCI-104 slot in uA1-I if you have the PCI card installed in the PCI slot.

Let's calculate.
Articia S (northbridge) has two PCI buses:

A) BUS-0. Here up to 5 PCI bus masters can be supported. Let say that to the BUS-0 they connected:

1. Southbridge (VIA 686B with ATA-100 (not used), USB 1.1, AC'97 (not used), PS/2)
2. PCI slot
3. ATA-133 controller (Sil O680)
4. FireWire (VT6307)
5. Sound (CMI7838)

B) BUS-1. This bus can be used as AGP x2 bus with sideband address bus protocol supported. In this mode any other PCI devices cannot be used on this bus.

It means that BUS-1 is configured as 66MHz PCI without the AGP features. In this mode BUS-1 supports up to 2 PCI bus masters.

They probably connected here:
1. Radeon 7000 in AGP x0 mode
2. Network (RTL8110)

PCI-104 slot cannot be connected to the BUS-1 because PCI-104 devices do not support 66MHz capabilities.

So where PCI-104 slot is connected?

I guess that PCI-104 slot is connected in parallel with the PCI slot on BUS-0. It means that it shares all signals of the PCI slot and you must select if you want to use PCI slot or PCI-104 slot. You cannot use both.

BTW. The PCI-104 slot is nothing more than downgraded PCI slot with untypical connector. The PCI-104 spec is here: http://www.pc104.org/technology/PDF/PCI-104%20v1_0.pdf
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#16 Adam Kowalczyk #18 Anonymous
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