You need the Nubus Powermac angle adapter to use a video card or DOS card in those machines. The L2 slot upgrade should have a passthrough slot to replicate the slot on the adapter.

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1. The 6100 Nubus adapter is for Nubus cards, of whatever kind.

2. The 6100 DOS card adapter is for 6100 DOS cards. It will also mount a 610 DOS card.

3. The 6100 PDS angle adapter is for AV and HPV x100 PDS video cards.

4. None of the above are the same.

5. Some G3 PDS upgrades will function as a PDS angle adapter.

5. There is no upgrade for the L2 cache slot, and if you have a G3 upgrade, you should remove any cache in the L2 slot.

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