840AV and 660AV: are the ROMs identical?

[Bunsen]

As in the title.  Does anyone know?  Would anyone be able to run a diff on the two files and see?

 

[trag]

Do you have a 660AV handy? I ask because you could compare the part numbers of the ROM chips. The 840AV ROMs are 341S0923 & 341S0924. If the 660 has chips with the same Apple part number then they're the same.

 

[Tam 400]

I have both,I could check for you,I do rember ?somthing a little different about the 840s Rom,I've all so got a box full of rom/ram for

Those Macs.The 660 was my first AV Mac an did a lot with they Pizza box.ill look an post back.

Cheers

 

[Bunsen]

Do you have a 660AV handy?

Er .... somewhere ...

Thanks for the chip numbers.  I can at least check that when I dig it up.

 

[Tam 400]

Yep,I've got 2 handy ,my 700 an 840av Quadra are put away,I will pull 840 out an check.

Cheers

 

[Tam 400]

Hey,pulled out my 660AVs an took a look,well they were empty,no ram an no Rom,I've bin looking at a lot of this stuff lately,old times an do rembemer that the norm! Was if it fit in the slot it should work,But! Didn't all ways work,some were fusse than others. Depending on SYS an what hard ware was in it,displays were the worst to try to configure.256K VRAM was pretty much standard in that day.i have a box full of it still.and all so!!! Thanks for asking me to look at those Macs,in be hind them was a Colour Classic I guess I stashed away,got to pull it out an take a look.so to answer your Q I think it yes they are the same stick of Rom,it will work in both I think.cheers

 

[Compgeke]

Going off a quick google search for "Mac Rom Archive"s and Quadra 660 or 840 roms, it looks like they're the same 2 meg ROM. I can't confirm off any real systems but I'd consider it quite likely they're the same.

 

[Bunsen]

Thanks, that's promising.

 

[Danamania]

Do you have a 660AV handy? I ask because you could compare the part numbers of the ROM chips. The 840AV ROMs are 341S0923 & 341S0924. If the 660 has chips with the same Apple part number then they're the same.

Those are exactly the numbers on my 660AV ROMs. 

https://dl.dropboxusercontent.com/u/5334905/660av_ROM.jpg

 

[Bunsen]

Thanks also, Danamania.

Noob question: does that imply that the contents of the ROMs are also identical?

 

[trag]

Thanks also, Danamania.

Noob question: does that imply that the contents of the ROMs are also identical?

Yes. If the Apple part number on the ROM chip(s) itself is the same, then the programmed content is the same.

Back when the Beige G3 was a current machine, Rev. A ROM vs. later revisions was a big deal because Rev. A did not support slave drives on the IDE busses. OWC tried to help folks identify their ROM revision with this lonnngg page about which ROM module part number (number on the PCB of the ROM module) corresponded to which revision. It was a mess because different instances of the same PCB might contain different ROM chips. If OWC had just noticed that the ROM chips had part numbers, it would have been simple.

 

[Bunsen]

Awesome.  Thank you all so much for your help.