The Gossamer video is on the logic board. According to this ADC document:

<http://developer.apple.com/documentation/Hardware/Developer_Notes/ Macintosh_CPUs-G3/PowerMac_G3/pmacG3.6.html>

the video operates across a 100 MHz graphics bus. Curious.

The same document also makes mention of the PERCH slot, which is described as microchannel connector and a superset of PCI, although not accepting PCI cards. It also appears to be the case the the original iMac "mezzanine" slot was actually a PERCH slot. Evidently, the only thing officially supported was the A/V card for the beige; Apple said the 3rd part development of the spec wouldn't be supported.

On Wednesday, July 2, 2003, at 09:09 AM, Keith Whaley wrote:

Since you seem to have a few specs at your fingertips, I have the Rev. C
ROM in my beige G3 DT "Gossamer" model, which also has the ATY Mach 64
Rage Pro video card.
Does that run at 66 mhz?
Do my 3 PCI slots run at the 66 Mhz bus speed?


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