Date: Sun, 9 May 2004 19:33:07 -0700 From: Ron <[EMAIL PROTECTED]>
I don't know about all the other replies, but some PCI cards need to be in the controlling slot. The top slot controls bank A. The fourth controls bank B. You need to know if any of the PCI's need to be in slot 1 (A or B). Faste ethernet is one that does, and so is video.
ron
That is incorrect, but an easy mistake to make as Mike Breeden's XLR8yourmac.com site preached this fallacy back when the x500s were still discussed on the site. (Note, I think it's a great site, he just made this one mistake.)
The confusion occurs because someone, somewhere started this rumor that only the top slots are "bus-mastering" without really understanding what the term means with respect to PCI. Every single PCI slot in every Apple and clone ever made is a bus-mastering slot. There are no PCI slots in Macintoshes which are not bus mastering slots. Period.
However, there is an artifact of the early PCI firmware or perhaps the OS which, under some circumstances, causes the first PCI card initialized to be the only card which can do block transfers, which are the faster transfers. This issue is discussed in Apple's "Designing PCI Cards and Drivers for Power Macintosh Computers".
There are also occasional PCI cards which don't play nice for one reason or another and need to be initialized first. The upper slots have lower "address" numbers and are initialized earlier than the lower slots at start up.
Jeff Walther
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