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IIsi ROM SIMM Part number?

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Anyone know the part number or identifying marks on a IIsi ROM SIMM? I have a bunch of 64-pin SIMMS I acquired recently and I don't want to let this slip through my hands by accident!


A close-up pic would be great too!


Edit: All of the 64-pin SIMMS I have are the 9-chip variety. I suspect they are memory for a IIfx.



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Let not just Google, but also gamba, be your friend. You are looking for a 4-chip ROM card, anyway.


I'm not aware that there was a parity variant of the IIsi, as there was with the IIci, but it is possible. Look at the chip speeds on the 9-chip 64-pinners. It is conceivable that they were RAM cards made for PCworld printers, which guess might be clinched if the chip speeds are low (eg, 100ns and up).



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  • 1 year later...

Having my IIsi ROM SIMM in front of me:


4 ROM Chips labled with a big VLSI and a copyright by Apple 1988.


On top left corner labled with "Apple Computer" and marks for the different ROMS: LL ML MH ROM.HH


On the bottom under the Chips:


RAM A 512K ROM SIMM B ROM ROM C 030-4339 D


Its a green card, 64-pinner

On the back side:





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  • 11 months later...
Having my IIsi ROM SIMM in front of me

What system software have you tried to run with that ROM to prove what it is?


I just had someone write me offline about this, and he too told me his ROM was "030-4339" and then he wrote back to say his eyes fooled him and the number is in fact 630-4669. No doubt you made the same mistake. But ROMs with p/n 630-4669 are stock SE/30 ROMs (or IIx or IIcx) according to Apple:



Here are photos, front and back, of my IIsi ROM currently running in my SE/30 and allowing me to boot into System 7.6.1 and OS 8.1:


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  • 2 weeks later...
  • 68kMLA Supporter
Since I originally posted the question, I acquired several ROM SIMMS and put pictures here:




I've mentioned this before in other threads...


To accurately track Apple ROMs, go by the numbers on the chips, not the numbers on the circuit boards. While Apple may have done a good job of having distinct circuit board part numbers in the Mac II family ROMs, they often did not do a good job. The reason is that the same circuit board can hold ROM chips with different code on it. So the circuit board only tells you what machines it might fit into, which can be a wide array. The ROM chips tell you what code is present.


Notice that the copyright on the artwork on the ROM circuit boards for the IIfx is 1989, long before the IIfx came out. The same circuit board can be used for many different models of computer.


In the case of Gary's IIsi ROM, it appears to have ROM chips with the parts number 341S0020 through 341S0023. The SOIC IIfx ROM has 341S0781 through 341S0784. The PLCC ROM has 341S0769 through 341S0772.


Incidentally, anyone who has ever tried to figure the revision of a Beige G3 ROM, could save a lot of trouble by looking at the ROM chips rather than the circuit board part numbers.

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