There were three revisions of the Beige G3 ROM: -A (LROG434-01/02), -B (LROG434-02) and -C (LROG434-03), and all with part no 820-0954. There are five subspecies of the Rev. A, but none of them allows more than one drive on each ATA bus. Loose Rev. B ROMs seem to be scarce, but Rev. B or Rev. C (the latter being far commoner) will allow two drives (master/slave) on a bus.

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While OWC's effort to document the Beige G3 ROM was noble, they failed miserably.

Ignore the markings on the circuit boards. Those are unusable because the different ROM chips will fit on any circuit board.

Check the numbers on the ROM chips on the ROM DIMM. Those are definitive. Now unfortunately, I don't remember the part numbers for the various revisions any more. The chips ending in 401 and 402 are the Rev. A. I've posted the other numbers to various lists somewhere, but can't remember where. Oh well.