From: [EMAIL PROTECTED] Date: Fri, 5 Dec 2003 21:07:11 EST Subject: Re: 8600 board
I got the "Windsurfer" in a "deal" with some 9500 stuff. It is the mobo only, without the ROM SIMM.
I did attempt to boot from the "Windsurfer" using a 9500 and its ROM-SIMM, and it wouldn't boot. Perhaps there are the same issues with "Windsurfer" and the 9500 ROM-SIMM as with the "Shiner" (AKA, ANS 500 and 700) and the 9500 ROM-SIMM.
The problem with the 9500 ROM in Shiner is twofold, I think.
First, there's the simple fact that the 9500 ROM does not contain drivers for the video chip and F&W SCSI chips on the Shiner motherboard. So, when booting from a Mac ROM, one has no support for those components. That would be acceptable, if not for the second problem.
The second problem is that the interrupts are wired differently on the Shiner. So the ROM in the 9500 expects the interrupts on the motherboard to be wired in a particular fashion, and they aren't connected properly. When an interrupt is generated, and that interrupt doesn't come from the component which the 9500 ROM expects it to, there's no way for the OS to service the interrupt and badness occurs.
Anyway, that's my theory based on hardware examination and Apple's developer notes.
So, the point of all that is that if you want to do some hunting with an ohmmeter, you may wish to look at the ANS Hardware Developer Notes for the table of external interrupts. I can help a little bit as far as telling you which PCI slot's interrupt is connected to which pin on Grand Central, but that part is the same on the 9500 and Shiner, so it seems unlikely it would be different on the Windsurfer. The Bandit interrupts are the thing that really moved, but I'm not certain which pin of the Bandit sends the interrupt. I've got most of the pins mapped out, so by elimination, I think I know which pin it must be.
Another possible reason why the 9500 ROM did not work in the Windsurfer could be how it was wired. Does the Windsurfer have spaces on the board for ROMs to be soldered down? Apple does some kind of tricky things with the Chip Enable wiring to make the motherboard ROM-replaced-by-ROM-module mechanism work. It's possible that the Windsurfer was not built in quite the same way, so when the ROM is installed in the Windsurfer the Chip Enable pins on the ROM chips may not be getting the proper signals.
Jeff Walther
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