hrmmm . . .
First, my PEx board has the two small sockets filled, I believe these sockets were intended for ROM development. My PEx board faithfully gives the proper startup chime, at power on, EVERY TIME! But gets stuck there, even with a Sonnet Crescendo G3 Accelerator Card that ought to work in it!
IIRC, there were pads on the MoBo for for the shipping unit's ROMs and the ROM DIMM was only intended for ROM upgrades, as was Apple's usual practice.
Back on topic: 8-o
There are a LOT of 1 & 2u PCI risers available for a reasonable amount of money. Hopefully I'll be getting a Micro ATX Dual Core Atom board and a 2 GB stick of RAM for it tomorrow. It may wind up in the ComPaq Portable II hack or in the very interesting digital STATION 910 case that's been busy snaring dust bunnies ever since I gutted it. It's a mid-tower design, pre ATX, with a center mounted riser setup for the slots that's perfect for what I'd like to do. The first test I'll do on the Intel board is try out a 6500 or 6400 riser in it after I've checked out the power spec. It's likely 32 bit 3.3v from the looks of the documentation, but I haven't got it nailed down yet. The 6x00 boards are right angle, but the rackmount PCI risers are "left angle" to have the slots hang off the other side of the riser. One could conceivably test one card in the bottom slot of the standard 6x00 riser and put a rackmount riser in the top slot to give one or two extra PCI slots in order to test the actual addressing limitations of the 6x00 with cards sticking up perpendicular to the MoBo. Might even make for an interesting RetroNeXTCubeHack™ or just use a 3 slot "left angled" riser and forgo COMM-Slot card access with the third full PCI slot, using that address over the PCI Bus. Dunno, it's late and my vacation ends soon. Gotta get some sleep . . .
First, my PEx board has the two small sockets filled, I believe these sockets were intended for ROM development. My PEx board faithfully gives the proper startup chime, at power on, EVERY TIME! But gets stuck there, even with a Sonnet Crescendo G3 Accelerator Card that ought to work in it!
IIRC, there were pads on the MoBo for for the shipping unit's ROMs and the ROM DIMM was only intended for ROM upgrades, as was Apple's usual practice.
Back on topic: 8-o
There are a LOT of 1 & 2u PCI risers available for a reasonable amount of money. Hopefully I'll be getting a Micro ATX Dual Core Atom board and a 2 GB stick of RAM for it tomorrow. It may wind up in the ComPaq Portable II hack or in the very interesting digital STATION 910 case that's been busy snaring dust bunnies ever since I gutted it. It's a mid-tower design, pre ATX, with a center mounted riser setup for the slots that's perfect for what I'd like to do. The first test I'll do on the Intel board is try out a 6500 or 6400 riser in it after I've checked out the power spec. It's likely 32 bit 3.3v from the looks of the documentation, but I haven't got it nailed down yet. The 6x00 boards are right angle, but the rackmount PCI risers are "left angle" to have the slots hang off the other side of the riser. One could conceivably test one card in the bottom slot of the standard 6x00 riser and put a rackmount riser in the top slot to give one or two extra PCI slots in order to test the actual addressing limitations of the 6x00 with cards sticking up perpendicular to the MoBo. Might even make for an interesting RetroNeXTCubeHack™ or just use a 3 slot "left angled" riser and forgo COMM-Slot card access with the third full PCI slot, using that address over the PCI Bus. Dunno, it's late and my vacation ends soon. Gotta get some sleep . . .