Graphics card for UP1500, AGP Compatibility and Signalling Voltages

[Will L Givens]

>From what I remember, the UP1500 is supposed to be pretty forgiving when
it comes to video cards unlike the UP1000/1100 provided you have the 
latest SRM.

-----Original Message-----
From: axp-list-bounces at redhat.com [mailto:axp-list-bounces at redhat.com] On
Behalf Of Matt Turner
Sent: Wednesday, November 26, 2008 11:22
To: Linux on Alpha processors
Subject: Graphics card for UP1500, AGP Compatibility and Signalling Voltages

Hi,

I'm attempting to determine what graphics cards are compatible with
the Samsung UP1500 motherboard.

It uses the AMD-761 chipset, which according to both the UP1500 user
manual and this Wikipedia article
(http://en.wikipedia.org/wiki/Comparison_of_AMD_chipsets) supports AGP
4x.

AGP 4x is defined as using 1.5v signalling voltages, whereas older
1x/2x AGP used 3.3v. To prevent you from frying your card, AGP slots
are keyed. See http://en.wikipedia.org/wiki/AGP#Compatibility

Now, if you look at the picture of a UP1500 motherboard
(http://alphalinux.org/wiki/index.php/Image:UP1500.jpg), it clearly
has the 3.3v key. This limits the available cards to Radeons through
the R300 series. I'd really like an AtomBIOS-enabled R500 to be able
to go straight from the blue backgrounded SRM console to a nice kernel
modesetting environment, but without the correct AGP keys, this can't
happen.

What's going on? AGP 4x is supported by the board, but not the
appropriate signalling voltages?

Otherwise, does anyone know of an AGP R500 card with the appropriate 3.3v
key?

Matt Turner

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