From: [EMAIL PROTECTED] Date: Sun, 12 Oct 2003 16:29:31 EDT
I tried using the "Wish I were..." control panel
Unfortunately, you would need to convince the 6100 it was a 7100 or vice versa, before the OS loads. For that purpose, Wish I were won't work, unfortunately. It makes the experiment much more difficult.
The ROM version with or without Wish I Were remained $77D.20F2 in the 6100.
Then I started up my stock 7100/66. APS displayed the machine ID as 112. I was surprised to see it also indicated the same $77D.20F2 ROM version as the 6100. Does it make sense tnd use
I think a bit of your last sentence was eaten by the ether monsters.
But, yes, it makes sense. Apple has built several families of machines in which the same chipset is used in all the machines in the family. Different members leave bits off depending on where they fit in the lineup.
So, on boot up, the ROM initializes things. Tests for the presence of the various devices and if something non-essential isn't there, it needn't be a big deal.
From what I can tell, the Centris/Quadra 610, 650 and 800 all use the same ROMs. The Q660AV and Q840AV appear to use the same ROM.
The 6100 and 7100 use the same ROMs as each other, but there's a slight variation for the 8100. I'm not sure why. The only thing that makes much sense is the additional SCSI bus, but why not just use the 8100 ROM in all three models if that were the issue? It could be something to do with the eight SIMM sockets. Hard to know. The 9150 uses yet another slight variation on the ROM, but that makes sense, because the 9150 actually uses a different AMIC chip from the rest of the members of the family.
Moving forward, the 7200, 7500, 8500, 9500, 7600, PowerCurve, PowerCenter, PowerTower, PowerWave, PowerCenter Pro, PowerTower Pro, Daystar Genesis, Umax J700 and Umax S900 all use the same ROM, $77D.28F2. There are a few exceptions to the above, because some 7200s were made with $77D.28F1 ROMs. I wonder if those are the one which had the ethernet issue reported in some machines early on.
Then the 7300, 8600 and 9600 had the same ROM, $77D.34F1. And the 8600 Enhanced and 9600 Enhanced (the two Kansas machines) have the same ROM, $77D.34F5.
Interestingly, you can take either of the later ROM revisions and install them in the earlier 28F2 machines (if you solder) and they work fine. In fact, if you do that with the $77D.34F5 ROM it will solve the Speculative Processing issue that early PCI machines have with G3 processors.
Oh, and the ROM DIMM for the PCI machines appears to be the same physically, albeit with very different code stored inside, as the ROM DIMM for the x100 machines.
I think I saw an Apple Tech note which said that the SE/30 ROM is the same as the IIx ROM as well...
Jeff Walther
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